Getting Start With Activiti

I want to do a video of IT tutorial, can you arrange the text content of the video tutorial for me according to the content of the website. Let’s start with the Activiti tutorial, where you give me a list of things to cover.

Of course. Below is an outline of the content of a video course about the Activiti tutorial. Please note that this outline is based on the official Activiti documentation and online tutorials and may need to be adapted to your needs.

1. Course introduction
   • Introduction to Activiti
   • Overview of course objectives and content
2. Activiti basic concept
   • Introduction to Workflow and Business Process Management (BPM).
   • Activiti engine components and architecture
   • BPMN 2.0 standard and Activiti support
3. Development environment setup
   • Activiti Designer is installed and used
   • Activiti Modeler is installed and used
   • Eclipse or IntelliJ IDEA integrated development environment configuration
4. Process definition and deployment
   • Create a process definition file (BPMN file)
   • Process elements (tasks, gateways, events, etc.)
   • The deployment process is defined to the Activiti engine
5. Process instance and task management
   • Start a process instance
   • Query task and process instances
   • Complete tasks and process instances
6. Process variables and forms
   • Use process variables
   • Creation and use of forms
   • Form properties and variable types
7. Events and listeners
   • Activiti event type
   • Event listener implementation and configuration
   • Use JavaDelegate and ExecutionListener
8. Service tasks are integrated with Java
   • Configuration and use of service tasks
   • Integration of Java classes and expressions
   • Use Spring to integrate with Activiti
9. Gateways and conditional flow control
   • Exclusive Gateway
   • Parallel Gateway
   • Inclusive Gateway
10. Process history and audits
    • Historical data query
    • Flowchart tracking and auditing
    • Management and optimization of process history data
11. Activiti REST API
    • Overview of the REST API
    • Introduction to API endpoints and features
    • Use cases and examples
12. Activiti Advanced Topics and Practices
    • Version management of process definitions
    • Process migration and upgrade
    • Permission management and authentication
13. Course summary
    • Review core concepts and technologies
    • Discussion of practical application scenarios
    • Extended learning resources and community support

Based on this outline, you can adjust and optimize as needed to meet your video tutorial needs.

Please explain in detail the introduction to Activiti

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Activiti is a lightweight open source Business Process Management (BPM) platform that provides a complete set of BPM solutions, including process design, execution, monitoring, optimization and other links. Activiti is based on the Java language, so it is cross-platform, extensible, and compatible.

Activiti was originally developed by Alfresco Software Ltd. and later became an independent open source project. At the heart of Activiti is a highly configurable and extensible workflow engine that supports business process models and standard BPMN2.0 process definitions.

Activiti provides a range of APIs and tools to make it easy for developers and business analysts to quickly build and deploy custom workflow applications. Activiti is designed to be modular and composable, so it can be easily integrated with other Java frameworks and applications such as Spring, Hibernate, MyBatis, Camunda, etc.

Activiti also provides additional features such as task management, form engine, process history, flowchart generation, etc., which can make it easier for users to manage and monitor workflows. In addition, Activiti provides a REST API that supports access to Activiti services through HTTP requests, facilitating the integration of external systems with Activiti.

In summary, Activiti is a powerful, easy-to-use, and scalable BPM solution that helps enterprises quickly build and deploy business process applications to improve productivity and business responsiveness.

Please explain in detail the course objectives and content overview

The course objectives and content overview is an important part of the introduction to Activiti tutorials, they help learners understand the core objectives and content scope of the course so that they can better understand and master the technology and application of Activiti.

Course objectives refer to the main goal or purpose of teaching activities and are usually related to the learner’s ability and level of knowledge. In the Activiti tutorial, course objectives may include the following:

1. Understand the core concepts and process design principles of BPMN.
2. Familiarity with the core components and APIs of the Activiti workflow engine.
3. Master the basic operations of Activiti process definition, instance, task and variable management.
4. Understand the principles and use cases of Activiti events and listeners.
5. Familiar with the basic use of Activiti service tasks and Java integration.
6. Master the basic principles and application scenarios of Activiti gateway and conditional process control.
7. Understand the history of the Activiti process and the basic operation and implementation of audits.
8. Learn about the basic features and use cases of the Activiti REST API.
9. Familiarize yourself with advanced Activiti topics and practices, such as process versioning, process migration and upgrade, permission management, and more.
10. Understand the application and practice of Activiti in real projects, and master the basic methods and skills for developing and deploying Activiti applications.

Content overview refers to the scope and arrangement of content in teaching activities, usually including the specific content and learning objectives of individual chapters and lessons. In the Activiti tutorial, the content overview may include the following:

1. Chapter 1: Course Introduction
   • Introduction to Activiti
   • Overview of course objectives and content
2. Chapter 2: Activiti Basic Concepts
   • Overview of workflows and BPMN
   • Activiti engine components and architecture
   • BPMN 2.0 standard and Activiti support
3. Chapter 3: Development Environment Setup
   • Installation and use of Activiti Designer and Modeler
   • Configuration of the Eclipse or IntelliJ IDEA integrated development environment
4. Chapter 4: Process Definition and Deployment
   • Create a process definition file (BPMN file)
   • Design and configuration of process elements (tasks, gateways, events, and so on).
   • The deployment process is defined to the Activiti engine
5. Chapter 5: Process Examples and Task Management
   • Start a process instance
   • Query task and process instances
   • Complete tasks and process instances
6. Chapter 6: Process Variables and Forms
   • Use process variables

Please continue

diffCopy code- 表单的创建和使用
- 表单属性和变量类型的配置和使用

Chapter 7: Events and Listeners – Activiti Event Types – Event Listener Implementation and Configuration – Using JavaDelegate and ExecutionListener

8. Chapter 8: Service Tasks Integration with Java
   • Configuration and use of service tasks
   • Integration of Java classes and expressions
   • Use Spring to integrate with Activiti
9. Chapter 9: Gateways and Conditional Flow Control
   • The principle and application scenarios of Exclusive Gateway
   • The principle and application scenarios of Parallel Gateway
   • Contains the principle and application scenarios of Inclusive Gateway
10. Chapter 10: Process History and Audit
    • Historical data query and process tracking
    • Flowchart generation and audit records
    • Management and optimization of process history data
11. Chapter 11: The Activiti REST API
    • Overview and rationale for REST APIs
    • Introduction to API endpoints and features
    • Use cases and examples
12. Chapter 12: Advanced Topics and Practice at Activiti
    • Version management and escalation of process definitions
    • Implementation methods and scenarios for process migration and upgrade
    • Principles and implementation of permission management and authentication
13. Chapter 13: Course Summary
    • Review core concepts and technologies
    • Discussion of practical application scenarios
    • Extended learning resources and community support

In summary, the course objectives and content overview are designed to provide learners with an understanding of the core objectives and content scope of the Activiti tutorial, helping them to learn and master the technology and application of Activiti more effectively.

Please explain in detail the introduction to workflow and business process management (BPM).

Workflow is a way to automate the processing and flow of tasks, information and documents within an organization or across organizational processes. Workflows can help enterprises standardize, automate, and optimize business processes to improve business efficiency and service quality.

Business Process Management (BPM) is a comprehensive management method and technology system, which helps enterprises standardize, automate and continuously improve business processes through the design, execution, monitoring and optimization of business processes. BPM aims to integrate various departments and business processes of an organization to improve business responsiveness, reduce costs and risks, and enhance the competitiveness of enterprises.

In practical applications, BPM usually includes the following aspects:

1. Business process modeling and design: Model, design, and optimize business processes using BPMN or other standard languages.
2. Business process execution and automation: Transform business processes into computer-executable process instances through BPM engines or other automation tools, and automate the flow and processing of tasks, information, and documents.
3. Business process monitoring and analysis: Through BPM systems or other monitoring tools, the execution of business processes, performance indicators and problems are monitored and analyzed, so as to identify and solve problems in a timely manner and improve process efficiency and service quality.
4. Business process improvement and continuous optimization: Through business process improvement methods and technologies, continuous optimization and improvement of business processes to improve business efficiency and quality, and meet changing business needs and market needs.

In short, as a comprehensive management method and technical system, BPM can help enterprises achieve standardization, automation and continuous improvement of business processes through the design, execution, monitoring and optimization of business processes, thereby improving business efficiency, service quality and competitiveness.

Please explain the Activiti engine components and architecture in detail

The Activiti engine is a core part of the Activiti workflow platform, which provides a range of APIs and services that support the execution and management of business process models and standard BPMN 2.0 process definitions. The components and architecture of the Activiti engine are the foundation of the Activiti workflow platform, and understanding them is important to master the technology and application of Activiti.

The Activiti engine components consist of the following parts:

1. Process Engine: is the core component of the Activiti engine, which is responsible for parsing BPMN2.0 process definition files, converting them into execution models, and managing process definitions, process instances, tasks, variables, historical data and other data.
2. Process Repository: is a process definition storage and management module that is responsible for managing all deployed process definition files and related information.
3. Process Runtime: is a process instance running and management module, responsible for starting, suspending, resuming, terminating process instances, and handling related tasks and events.
4. Task Service: is a task management module, responsible for managing the creation, assignment, processing and completion of tasks, as well as task query and pagination functions.
5. Identity Service: is an authentication and authorization module that is responsible for the management, authorization, and authentication of users and user groups.
6. Management Service: is a management and monitoring module, responsible for the configuration, database, cache, jobs and logs of the management engine.

The architecture of the Activiti engine is based on modular and extensible design ideas, and it can be easily integrated with other Java frameworks and applications, such as Spring, Hibernate, MyBatis, Camunda, etc. The architecture of the Activiti engine consists of the following parts:

1. Database: The Activiti engine uses relational databases (such as MySQL, Oracle, PostgreSQL, etc.) to store process definitions, process instances, tasks, variables, historical data, etc.
2. Engine configuration: Configuration information for the Activiti engine is stored in a configuration file or Spring configuration and can be configured through a configuration file or Java code.
3. Service layer: The service layer of the Activiti engine is the entry point for all services, which provides APIs and interfaces for services such as process definitions, process instances, tasks, variables, and historical data.
4. Deployer: The deployer of the Activiti engine is responsible for parsing the BPMN2.0 process definition file and converting it into an execution model for storage in the database.
5. Job Executor: The Activiti engine’s Job Executor handles asynchronous and scheduled tasks, as well as managing job queues and executor pools.

In short, the components and architecture of the Activiti engine are the core of the Activiti workflow platform, and understanding them is very important to master the technology and application of Activiti

Please explain in detail the BPMN 2.0 standard and Activiti support

BPMN (Business Process Model and Notation) is a graphical presentation language for business process modeling and standardization, developed and maintained by Object Management Group (OMG). BPMN2.0 is the latest version of BPMN, released in 2011, and is currently the most widely used version.

The BPMN2.0 standard contains a variety of process elements, such as tasks, gateways, events, data objects, process participants, etc., which can be combined into a variety of complex business process models, and provides rich semantic and graphical representations to help business analysts, developers, and users better understand and use business process models.

Activiti is an open source workflow engine based on the BPMN2.0 standard that provides full BPMN2.0 support to easily create, deploy, execute, and manage BPMN2.0-compliant business process models.

Activiti supports various process elements in the BPMN 2.0 standard, including:

1. Task: Represents an executable task in a business process that usually requires processing by a user or system.
2. Gateway: Represents the decision point in the business process, which is used to branch and merge the process.
3. Event: Represents the events in the business process, including start events, intermediate events, end events, etc.
4. Data Object: Represents data objects in business processes, such as forms, documents, messages, etc.
5. Process participants (Participant): Represent participants in a business process, including roles, organizations, people, etc.

Activiti also provides extended elements and attributes to support more complex business needs, such as:

1. Service Task: Represents a service task in a business process, usually requiring calling an external service or executing Java code to implement it.
2. User Task: Represents a user task in a business process that needs to be assigned to one or more users.
3. Timer: Represents a timer in a business process that can trigger the corresponding event after a certain time.

In summary, the BPMN2.0 standard is a graphical representation language for business process modeling and standardization, Activiti is an open source workflow engine based on the BPMN2.0 standard, which provides full BPMN2.0 support to easily create, deploy, execute, and manage BPMN2.0-compliant business process models.

Please explain in detail the installation and use of Activiti Designer

Activiti Designer is an Eclipse-based plugin for creating, editing, and validating Activiti process definition files (BPMN 2.0). Activiti Designer provides a wealth of graphical tools and a visual editor to help developers quickly create and modify Activiti process definition files.

Here are the steps to install and use Activiti Designer:

1. Install Eclipse: You first need to install the Eclipse IDE (Eclipse 4.7 or later), which can be downloaded and installed from the official Eclipse website.
2. Install the Activiti Designer plugin: Open Eclipse, select the “Help” menu, click “Eclipse Marketplace”, enter “Activiti Designer” in the search bar, click the “Go” button, select the “Activiti Designer” plugin and click the “Install” button, and follow the prompts to complete the installation of the plugin.
3. Create an Activiti project: Select the “File” menu in Eclipse, click “New” – > “Other” – > “Activiti” – > “Activiti Project”, enter the project name and location and other information in the pop-up dialog box, and click the “Finish” button to create an Activiti project.
4. Create a process definition file: In the created Activiti project, right-click the “src/main/resources” folder, select “New”-> “Activiti Diagram”, enter the file name and location and other information, and click the “Finish” button to create the process definition file.
5. Edit a process definition file with Activiti Designer: Double-click to open the created process definition file and create, modify, and validate the process definition file using the graphical tools and visual editor provided by Activiti Designer.
6. Deploy the process definition file: After you finish creating and editing the process definition file, you can use the API or command line tools provided by Activiti to deploy the process definition file to the Activiti engine, start the process instance, and process the business process.

In summary, Activiti Designer is an Eclipse-based plugin for creating, editing, and validating Activiti process definition files (BPMN 2.0). Installing and using Activiti Designer requires first installing Eclipse, then installing the Activiti Designer plugin, creating Activiti projects and process definition files, editing and validating them with Activiti Designer, and finally deploying the process definition files to the Activiti engine to start the process instance.

Please explain in detail the installation and use of Activiti Modeler

Activiti Modeler is a web-based process modeling tool that can be accessed and used directly in the browser. Activiti Modeler provides a wealth of graphical tools and visual editors to help users quickly create and modify Activiti process definition files (BPMN2.0) and export them to formats such as XML files or SVG files.

Here are the steps to install and use Activiti Modeler:

1. Download Activiti Modeler: First, you need to download the compressed package of Activiti Modeler from the official website of Activiti and extract it to a local folder.
2. Deploy the Activiti Modeler: Deploy the extracted Activiti Modeler folder to a web server, such as Tomcat or Jetty. Activiti Modeler can be placed at the root of a web application or deployed as a standalone web application.
3. Visit Activiti Modeler: Enter the Activiti Modeler’s access URL (e.g. http://localhost:8080/activiti-modeler) in your web browser to access the Activiti Modeler’s login page.
4. Create a process definition file with Activiti Modeler: Once logged in to Activiti Modeler, you can create, modify, and validate process definition files using the graphical tools and visual editor provided by Activiti Modeler. Process definition files created in Activiti Modeler can be exported to formats such as XML files or SVG files for later use.
5. Deploy the process definition file: After you finish creating and editing the process definition file, you can use the API or command line tools provided by Activiti to deploy the process definition file to the Activiti engine, start the process instance, and process the business process.

In summary, Activiti Modeler is a web-based process modeling tool that can be accessed and used directly in the browser. Creating a process definition file with Activiti Modeler requires deploying the Activiti Modeler to a web server, then accessing the Activiti Modeler’s login page, creating, modifying, and validating the process definition file using the graphical tools and visual editor provided by Activiti Modeler, and finally deploying the process definition file to the Activiti engine to start the process instance.

Please explain in detail the Eclipse or IntelliJ IDEA integrated development environment configuration

Activiti can be integrated into a variety of Java integrated development environments (IDEs) for development and debugging, such as Eclipse, IntelliJ IDEA, etc. Here are the configuration steps for Eclipse and IntelliJ IDEA to integrate Activiti:

Eclipse integrates with Activiti

1. Download and install Eclipse: Download and install the latest version of the Eclipse IDE from the official Eclipse website.
2. Install the Activiti plugin: Select the “Help” menu in Eclipse, click “Eclipse Marketplace”, enter “Activiti” in the search bar, select “Activiti Designer” and “Activiti BPMN Editor” plugins and click the “Install” button, follow the prompts to complete the plugin installation.
3. Create an Activiti project: Select the “File” menu in Eclipse, click “New” > “Project” – > “Activiti” – > “Activiti Project”, enter the project name and location and other information in the pop-up dialog box, and click the “Finish” button to create an Activiti project.
4. Write and debug Activiti code: Write and debug Activiti process definition files and Java code in Activiti projects.

IntelliJ IDEA integrates with Activiti

1. Download and install IntelliJ IDEA: Download and install the latest version of IntelliJ IDEA from the official IntelliJ IDEA website.
2. Install the Activiti plugin: Select the “File” menu in IntelliJ IDEA, click “Settings”, select “Plugins”, enter “Activiti” in the search bar, select the “Activiti” plugin and click the “Install” button, and follow the prompts to complete the installation of the plugin.
3. Create an Activiti project: Select the “File” menu in IntelliJ IDEA, click “New” > “Project”, select the “Activiti” template in the pop-up dialog box, enter the project name and location and other information, and click the “Next” button to create an Activiti project.
4. Write and debug Activiti code: Write and debug Activiti process definition files and Java code in Activiti projects.

In summary, both Eclipse and IntelliJ IDEA can integrate Activiti for development and debugging. Integrating Activiti requires downloading and installing the corresponding IDE, then installing the Activiti plugin, and creating an Activiti project for development and debugging. In Eclipse, you need to install the “Activiti Designer” and “Activiti BPMN Editor” plugins; In IntelliJ IDEA, the “Activiti” plugin needs to be installed.

Please explain in detail how to create a process definition file (BPMN file)

In Activiti, a process definition file (BPMN file) is a file used to define a business process, which is described and represented using the BPMN 2.0 standard. Here are the steps to create a process definition file (BPMN file) in Activiti:

1. Open Activiti Modeler or Activiti Designer: Activiti Modeler is a web application that can be accessed and used in a browser; Activiti Designer is an Eclipse-based plugin that needs to be installed and configured in Eclipse. After opening the Activiti Modeler or Activiti Designer, you can start creating the process definition file.
2. Create a new process definition file: In Activiti Modeler or Activiti Designer, you can create a new process definition file using the File menu or shortcut keys such as Ctrl+N. Select the “BPMN 2.0 Process” or “Activiti Diagram” template, enter information such as file name and location, and click the “OK” or “Finish” button to create a new process definition file.
3. Add process elements: In the process definition file, you can add various process elements such as tasks, gateways, events, data objects, process participants, etc., using the graphical tools and visual editors provided by Activiti Modeler or Activiti Designer. You can drag and connect various process elements, set properties and parameters, and other information.
4. Validate and debug process definition files: After you have created a process definition file, you can verify the correctness and completeness of the process definition file using the validation tools provided by Activiti Modeler or Activiti Designer. You can also use the API or command line tools provided by Activiti to deploy process definition files into the Activiti engine, launch process instances, and debug and test them.
5. Export process definition file: After editing and debugging the process definition file, you can use the export function provided by Activiti Modeler or Activiti Designer to export the process definition file to an XML file or SVG file for subsequent use and sharing.

In summary, creating a process definition file (BPMN file) in Activiti requires the use of tools such as Activiti Modeler or Activiti Designer, creating a new process definition file, adding various process elements, validating and debugging the process definition file, and finally exporting the process definition file to a format such as an XML file or SVG file.

Please explain the process elements in detail (tasks, gateways, events, etc.)

In Activiti, process elements are the basic units that make up a process definition file (BPMN file) that describes and controls the flow of business processes. Process elements include tasks, gateways, events and other types, the following is a detailed explanation of the process elements commonly used in Activiti and their functions:

1. Task: A task is a basic unit of work in a process that describes operations such as business activities or human tasks. Tasks can be of type such as User Task, Service Task, or Script Task. Tasks can set properties such as name, participants, processing logic, forms, and so on, to guide the execution of business processes.
2. Gateway: A gateway is a branch control element in a process that controls the process based on conditions. Gateways can be of the type of Exclusive Gateway, Parallel Gateway, Inclusive Gateway, or Event-Based Gateway. The gateway can set properties such as conditions, branching conditions, merge conditions, and so on, which are used to control the branching and merging of business processes.
3. Event: An event is a state change element in the process that represents various events in the business process, such as start events, end events, intermediate events, etc. Events can be of type such as Catching Event, Boundary Event, or Throwing Event. Events can set properties such as event type, trigger conditions, and response actions to control the state change of business processes.
4. Connection object (Sequence Flow): The connection object is a connection line element in the process, which is used to connect different process elements and represent the flow relationship in the business process. Connection objects can set properties such as conditions, names, and process variables to guide the flow of business processes.
5. Sub-Process: A sub-process is a composite element in a process that combines multiple tasks, gateways, events, and other elements into a single sub-process. Subprocesses can be of type such as Embedded Sub-Process or Independent Sub-Process. Sub-processes can set properties such as sub-process type, name, and variables to manage complex sub-processes in business processes.

In short, in Activiti, various process elements such as tasks, gateways, and events are the basic units that make up a process definition file (BPMN file), which is used to describe and control the flow of business processes. Different types of process elements have different roles and properties and can be combined into a variety of complex business processes. Proficiency in the process elements in Activiti is an important foundation for business process design and development.

Please explain the other process elements in detail

In addition to the common process elements such as tasks, gateways, and events mentioned earlier, there are other process elements in Activiti. Here is a detailed explanation of other process elements commonly found in Activiti and what they do:

1. Data Object: A data object is a process element used to describe business data, which can be input data, output data, or intermediate data. Data objects can be of type such as Data Object Reference or Data Object Collection. Data objects can set properties such as name, type, value, and so on, which are used to describe and communicate business data.
2. Artifact: Resources are process elements used to describe and manage process documents and information. Resources can be of type such as Text Annotation, Documentation, or Association. Resources can set properties such as name, type, description, and so on to record and manage process documents and information.
3. Process Participant (Participant): A process participant is a process element used to describe and manage business process participants. Process participants can be of type such as Role, Group or User. Process participants can set properties such as name, type, identifier, and so on for managing business process participants.
4. Process Reference: A process reference is a process element used to describe and manage other processes. Process references can reference processes defined in other BPMN files to enable modularization and reuse of business processes. Process references can set properties such as names, identifiers, and so on, to manage other processes.
5. Data Input/Output: Data input and output are process elements used to describe the input and output data of process elements such as tasks, events, and gateways. Data input and output can set properties such as name, type, value, etc., which are used to describe and pass business data.

In summary, in Activiti, in addition to common process elements such as tasks, gateways, and events, there are other types of process elements such as data objects, resources, process participants, process references, and data input and output. These process elements are used to describe and control the various details and characteristics of business processes and are important for business process design and development.

Please explain in detail how to deploy the process definition to the Activiti engine

In Activiti, a process definition file (BPMN file) is a description of a business process that needs to be deployed to the Activiti engine in order to start and execute a business process. Here are the detailed steps on how to deploy a process definition file to the Activiti engine:

1. Create an Activiti engine configuration: In Java code, use the API provided by Activiti to create an Activiti engine configuration (ProcessEngineConfiguration), set parameters such as data source, transaction manager, and task executor, and create an Activiti engine object (ProcessEngine).
2. Get Activiti Storage Service: Use the Activiti engine object to obtain the Activiti Storage Service (RepositoryService) to manage the deployment and query of process definition files.
3. Deploy the process definition file: Use the deployment method (deploy) of the Activiti storage service to deploy the process definition file (BPMN file) to the Activiti engine. Deployment methods can accept types of input such as files, file input streams, or ZIP archives. When you deploy a process definition file, you need to set properties such as the name, category, and version of the process definition file.
4. Validate the process definition file: After the process definition file is deployed, you can use the validateProcess of the Activiti storage service to verify the correctness and integrity of the process definition file. The validation method can check for problems such as the XML format of the process definition file, the attributes of various elements, the connectivity of the flowchart, etc.
5. Start the process definition: After the process definition file is deployed, you can use the Activiti Runtime Service to start the process definition, create process instances, and execute the business process. The running service can use methods such as startProcessInstanceByKey or startProcessInstanceById to start a process instance and pass parameters such as business variables.

In summary, in Activiti, process definition files need to be deployed into the Activiti engine in order to initiate and execute business processes. To deploy the process definition file, you need to create the Activiti engine configuration, obtain the Activiti storage service, deploy the process definition file, verify the process definition file and start the process definition. Proficiency in Activiti’s process deployment and execution operations is key to business process development and debugging.

Please explain in detail how to start the process instance

In Activiti, a process instance is a concrete business process instance created based on a process definition file (BPMN file). Starting a process instance is the process of instantiating a process definition file into a process instance to begin the execution of a business process. Here are the detailed steps on how to start a process instance in Activiti:

1. Get the Activiti running service: Use the Activiti engine object to obtain the Activiti running service (RuntimeService), which is used to start the process instance and manage the process instance.
2. Start a process instance from a process definition file: Use the start process instance method (startProcessInstanceByKey or startProcessInstanceById) to run the service using Activiti to start a process instance based on the key or ID of the process definition file. If you use the startProcessInstanceByKey method to start a process instance, you need to pass the key parameters of the business process; If you start a process instance using the startProcessInstanceById method, you do not need to pass key parameters to the business process.
3. Pass business process variables: You can pass variables for business processes when you start a process instance. You can use methods such as setVariable or setVariables to run services with Activiti to set variables of business processes that control the execution of business processes.
4. Listen to process instance events: After you start a process instance, you can use services such as Activiti Event Service or Activiti Task Service to listen for process instance events or task events. Events and tasks can be monitored and processed using Java code or expressions.

In summary, in Activiti, starting a process instance is the process of instantiating a process definition file into a process instance to start executing a business process. To start a process instance, you need to obtain the Activiti running service, start the process instance according to the process definition file, pass business process variables, and listen for process instance events. Proficiency in Activiti’s process instance initiation and event-handling operations is key to business process development and debugging.

Please give sample code

Here is sample code to start a process instance using Java code:

javaCopy codeimport org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

import java.util.HashMap;
import java.util.Map;

public class ActivitiDemo {

    public static void main(String[] args) {
        // 创建Activiti引擎配置
        ProcessEngineConfiguration cfg = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .setJdbcDriver("com.mysql.jdbc.Driver")
                .setJdbcUrl("jdbc:mysql://localhost:3306/activiti?useSSL=false")
                .setJdbcUsername("root")
                .setJdbcPassword("root")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        // 创建Activiti引擎对象
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 获取Activiti运行服务
        RuntimeService runtimeService = processEngine.getRuntimeService();

        // 部署流程定义文件
        Deployment deployment = repositoryService.createDeployment()
                .addClasspathResource("processes/myProcess.bpmn")
                .deploy();

        // 根据流程定义文件启动流程实例，并传递业务流程变量
        Map<String, Object> variables = new HashMap<>();
        variables.put("userId", "123");
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("myProcess", variables);

        // 获取当前流程实例的任务，并完成任务
        TaskService taskService = processEngine.getTaskService();
        Task task = taskService.createTaskQuery()
                .processInstanceId(processInstance.getId())
                .singleResult();
        taskService.complete(task.getId());

        // 关闭Activiti引擎
        processEngine.close();
    }
}

This code uses the Activiti engine configuration to create the Activiti engine object and uses Activiti to run the service deployment process definition file. The process instance is then started using the key of the process definition file and the business process variables are passed. Finally, get the task of the current process instance and complete the task. At the end of the code, shut down the Activiti engine.

Please explain in detail how to query task and process instances

In Activiti, a task is to execute a specific work item in a business process, and a process instance is a concrete execution instance of a process definition file. Querying tasks and process instances is an important operation for business process management and monitoring. Here are the detailed steps on how to query task and process instances in Activiti:

1. Get Activiti Task Service: Use the Activiti engine object to obtain the Activiti Task Service for querying tasks and completing tasks.
2. Query tasks: Use the Activiti task service to query tasks using the createTaskQuery method. The query method can set conditions such as the executor, status, and process instance ID of the task to accurately query the task. Query methods can return a single task or multiple tasks.
3. Complete the task: Use the Activiti task service to complete the task (complete). The task completion method needs to pass the ID of the task or the Task object, which is used to identify the task to be completed. The Complete Task method can pass parameters such as business process variables to control the execution of the business process.
4. Get the Activiti History Service: Use the Activiti engine object to obtain the Activiti History Service, which is used to query historical tasks and process instances.
5. Query historical tasks: Use the query method of the Activiti history service (createHistoricTaskInstanceQuery) to query historical tasks. The query method can set conditions such as the performer, status, and process instance ID of historical tasks to accurately query historical tasks. Query methods can return a single historical task or multiple historical tasks.
6. Query process instances: Use the createProcessInstanceQuery method of the Activiti running service to query process instances. The query method can set conditions such as the key, ID, and business keywords of the process instance to accurately query the process instance. Query methods can return a single process instance or multiple process instances.

In summary, in Activiti, querying tasks and process instances is an important operation for business process management and monitoring. To query tasks and process instances, you need to obtain the Activiti task service, the Activiti history service, or the Activiti running service, and use APIs such as query method and task completion method to operate. Proficiency in Activiti’s task and process instance query operations is key to business process management and monitoring.

Please give a code example

The following is sample code for querying task and process instances using Java code:

javaCopy codeimport org.activiti.engine.*;
import org.activiti.engine.history.HistoricTaskInstance;
import org.activiti.engine.history.HistoricTaskInstanceQuery;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.runtime.ProcessInstanceQuery;
import org.activiti.engine.task.Task;
import org.activiti.engine.task.TaskQuery;

import java.util.List;

public class ActivitiDemo {

    public static void main(String[] args) {
        // 创建Activiti引擎配置
        ProcessEngineConfiguration cfg = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .setJdbcDriver("com.mysql.jdbc.Driver")
                .setJdbcUrl("jdbc:mysql://localhost:3306/activiti?useSSL=false")
                .setJdbcUsername("root")
                .setJdbcPassword("root")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        // 创建Activiti引擎对象
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 获取Activiti任务服务
        TaskService taskService = processEngine.getTaskService();

        // 查询任务
        TaskQuery taskQuery = taskService.createTaskQuery()
                .taskAssignee("user1")
                .orderByTaskCreateTime()
                .asc();
        List<Task> tasks = taskQuery.list();
        for (Task task : tasks) {
            System.out.println("任务ID：" + task.getId());
            System.out.println("任务名称：" + task.getName());
            System.out.println("任务创建时间：" + task.getCreateTime());
            System.out.println("任务执行人：" + task.getAssignee());
        }

        // 完成任务
        Task task = taskQuery.singleResult();
        taskService.complete(task.getId());

        // 获取Activiti历史服务
        HistoryService historyService = processEngine.getHistoryService();

        // 查询历史任务
        HistoricTaskInstanceQuery historicTaskInstanceQuery = historyService.createHistoricTaskInstanceQuery()
                .taskAssignee("user1")
                .orderByTaskCreateTime()
                .asc();
        List<HistoricTaskInstance> historicTasks = historicTaskInstanceQuery.list();
        for (HistoricTaskInstance historicTask : historicTasks) {
            System.out.println("历史任务ID：" + historicTask.getId());
            System.out.println("历史任务名称：" + historicTask.getName());
            System.out.println("历史任务创建时间：" + historicTask.getCreateTime());
            System.out.println("历史任务执行人：" + historicTask.getAssignee());
        }

        // 获取Activiti运行服务
        RuntimeService runtimeService = processEngine.getRuntimeService();

        // 查询流程实例
        ProcessInstanceQuery processInstanceQuery = runtimeService.createProcessInstanceQuery()
                .processDefinitionKey("myProcess")
                .orderByProcessInstanceId()
                .desc();
        List<ProcessInstance> processInstances = processInstanceQuery.list();
        for (ProcessInstance processInstance : processInstances) {
            System.out.println("流程实例ID：" + processInstance.getId());
            System.out.println("流程定义ID：" + processInstance.getProcessDefinitionId());
            System.out.println("流程实例状态：" + processInstance.isSuspended());
            System.out.println("业务关键字：" + processInstance.getBusinessKey());
        }

        // 关闭Activiti引擎
        processEngine.close();
    }
}

This code uses the Activiti engine configuration to create an Activiti engine object, and uses the Activiti task service to query tasks and complete tasks. Then use the Activiti calendar

Please explain in detail how to complete tasks and process examples

In Activiti, a task is to execute a specific work item in a business process, and a process instance is a concrete execution instance of a process definition file. Completing tasks and process instances is a key operation that controls the execution of business processes. Here are the detailed steps on how to complete tasks and process examples in Activiti:

1. Get Activiti task service: Use the Activiti engine object to obtain the Activiti task service (TaskService), which is used to complete tasks and other operations.
2. Query tasks to be completed: Use the Activiti task service to query the tasks to be completed. The query method can set conditions such as the executor, status, and process instance ID of the task to accurately query the task. Query methods can return a single task or multiple tasks.
3. Complete the task: Use the Activiti task service to complete the task (complete). The task completion method needs to pass the ID of the task or the Task object, which is used to identify the task to be completed. The Complete Task method can pass parameters such as business process variables to control the execution of the business process.
4. Get the Activiti History Service: Use the Activiti engine object to obtain the Activiti History Service, which is used to query historical tasks and process instances.
5. Query historical tasks: Use the query method of the Activiti history service (createHistoricTaskInstanceQuery) to query historical tasks. The query method can set conditions such as the performer, status, and process instance ID of historical tasks to accurately query historical tasks. Query methods can return a single historical task or multiple historical tasks.
6. Get Activiti running service: Use the Activiti engine object to obtain the Activiti running service (RuntimeService), which is used to manage operations such as process instances.
7. Query process instances: Use the createProcessInstanceQuery method of the Activiti running service to query process instances. The query method can set conditions such as the key, ID, and business keywords of the process instance to accurately query the process instance. Query methods can return a single process instance or multiple process instances.
8. Pause or activate a process instance: Pause or activate the execution of a process instance using the suspendProcessInstanceById or activateProcessInstanceById method (suspendProcessInstanceById) using the Activiti running service. After you pause a process instance, the process instance cannot perform tasks; After the process instance is activated, the process instance can continue to perform tasks.

In summary, in Activiti, completing tasks and process instances is the key operation that controls the execution of business processes. To complete tasks and process instances, you need to obtain the Activiti task service, Activiti history service, or Activiti running service, and use APIs such as query method, task completion method, and pause or activate process instance method to operate. Proficiency in Activiti’s task and process instance completion operations is key to business process development and debugging.

Please give a code example

Here is sample code for completing tasks and process examples using Java code:

javaCopy codeimport org.activiti.engine.*;
import org.activiti.engine.history.HistoricTaskInstance;
import org.activiti.engine.history.HistoricTaskInstanceQuery;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.runtime.ProcessInstanceQuery;
import org.activiti.engine.task.Task;
import org.activiti.engine.task.TaskQuery;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ActivitiDemo {

    public static void main(String[] args) {
        // 创建Activiti引擎配置
        ProcessEngineConfiguration cfg = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .setJdbcDriver("com.mysql.jdbc.Driver")
                .setJdbcUrl("jdbc:mysql://localhost:3306/activiti?useSSL=false")
                .setJdbcUsername("root")
                .setJdbcPassword("root")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        // 创建Activiti引擎对象
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 获取Activiti任务服务
        TaskService taskService = processEngine.getTaskService();

        // 查询待完成任务
        TaskQuery taskQuery = taskService.createTaskQuery()
                .taskAssignee("user1")
                .orderByTaskCreateTime()
                .asc();
        Task task = taskQuery.singleResult();

        // 完成任务
        Map<String, Object> variables = new HashMap<>();
        variables.put("approve", true);
        taskService.complete(task.getId(), variables);

        // 获取Activiti历史服务
        HistoryService historyService = processEngine.getHistoryService();

        // 查询历史任务
        HistoricTaskInstanceQuery historicTaskInstanceQuery = historyService.createHistoricTaskInstanceQuery()
                .taskAssignee("user1")
                .orderByTaskCreateTime()
                .asc();
        List<HistoricTaskInstance> historicTasks = historicTaskInstanceQuery.list();
        for (HistoricTaskInstance historicTask : historicTasks) {
            System.out.println("历史任务ID：" + historicTask.getId());
            System.out.println("历史任务名称：" + historicTask.getName());
            System.out.println("历史任务创建时间：" + historicTask.getCreateTime());
            System.out.println("历史任务执行人：" + historicTask.getAssignee());
        }

        // 获取Activiti运行服务
        RuntimeService runtimeService = processEngine.getRuntimeService();

        // 查询流程实例
        ProcessInstanceQuery processInstanceQuery = runtimeService.createProcessInstanceQuery()
                .processDefinitionKey("myProcess")
                .orderByProcessInstanceId()
                .desc();
        List<ProcessInstance> processInstances = processInstanceQuery.list();
        for (ProcessInstance processInstance : processInstances) {
            System.out.println("流程实例ID：" + processInstance.getId());
            System.out.println("流程定义ID：" + processInstance.getProcessDefinitionId());
            System.out.println("流程实例状态：" + processInstance.isSuspended());
            System.out.println("业务关键字：" + processInstance.getBusinessKey());
        }

        // 关闭Activiti引擎
        processEngine.close();
    }
}

This code uses the Activiti engine configuration to create an Activiti engine object, and uses the Activiti task service to query the tasks to be completed and complete the tasks. Then use the Activiti history service to query the history task, and use Activiti to run the service query process instance. At the end of the code, shut down the Activiti engine.

Please explain in detail how to use process variables

Process variables are a very important concept in Activiti, which can be used to transfer data and control the direction of the process. In Activiti, a process variable is a key-value pair that can be set on a process instance, task, and execution object. Here are the detailed steps on how to use process variables:

1. Set process variables: Process variables can be set using the Set Process Variable method of the Activiti task service or the Set Local Process Variable method (setVariableLocal). The Set Process Variable method requires passing the process instance ID, task ID, or execution object ID, as well as the name and value of the process variable. If you set a process variable by setting a local process variable, the process variable can only be used in the current task and cannot be passed to the next task.
2. Get process variables: Process variables can be obtained using the Get Process Variable method (getVariable) or the Get Local Process Variable method (getVariableLocal) of the Activiti task service. The Get Process Variable method passes the process instance ID, task ID, or execution object ID, and the name of the process variable to get the value of the specified process variable.
3. Delete process variables: Process variables can be deleted using the Remove Process Variable method (removeVariable) or the Delete Local Process Variable method (removeVariableLocal) of the Activiti task service. The Delete Process Variable method passes the process instance ID, task ID, or execution object ID, and the name of the process variable to delete the specified process variable.

In summary, in Activiti, process variables can be used to transfer data and control the direction of the process. Setting process variables, getting process variables, and deleting process variables can all use the APIs provided by the Activiti task service. Process variables are widely used in business process development and debugging, and proficiency in the use of process variables is the key to business process development.

The following is sample code that sets, gets, and deletes process variables using Java code:

javaCopy codeimport org.activiti.engine.*;
import org.activiti.engine.history.HistoricVariableInstance;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

import java.util.HashMap;
import java.util.Map;

public class ActivitiDemo {

    public static void main(String[] args) {
        // 创建Activiti引擎配置
        ProcessEngineConfiguration cfg = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .setJdbcDriver("com.mysql.jdbc.Driver")
                .setJdbcUrl("jdbc:mysql://localhost:3306/activiti?useSSL=false")
                .setJdbcUsername("root")
                .setJdbcPassword("root")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        // 创建Activiti引擎对象
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 获取Activiti任务服务
        TaskService taskService = processEngine.getTaskService();

        // 启动流程实例并设置流程变量
        RuntimeService runtimeService = processEngine.getRuntimeService();
        Map<String, Object> variables = new HashMap<>();
        variables.put("approve", true);
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("my

Please explain in detail how forms are created and used

In business processes, forms are very important to collect and present business data and help the execution of business processes. In Activiti, forms can be configured on task nodes or process instances through Activiti Designer or manually created.

Here are the detailed steps on how to create and use a form:

1. Create forms: Forms can be created using Activiti Designer or manually. In Activiti Designer, forms can be created by dragging and dropping components, setting properties, etc. Creating forms manually requires the use of technologies such as HTML, JavaScript, etc., to create forms and style and interact. When you create a form, you can set properties such as form data binding, form style, and form interaction to meet the needs of business processes.
2. Configure forms: Forms can be configured on task nodes or process instances. On a task node, you can set properties such as form type and form data binding to display and collect business data from the task node. On a process instance, you can set properties such as form type and form data binding to display and collect business data from the process instance.
3. Use forms: When the business process is executed, the form of the task node can be obtained through the getTaskFormData method of the Activiti task service, and the form of the task node can be submitted through the submit form method (submitTaskFormData) of the Activiti form service. When you submit the form of a task node, you can set the form data, upload files, and other information to update the status of the business process.

In conclusion, in Activiti, forms are very important to collect and present business data and help with the execution of business processes. Creating forms, configuring forms, and using forms can all be achieved through Activiti Designer or manually creating, setting up, and invoking APIs. Proficiency in the creation and use of forms is key to business process development.

The following is the sample code to get the task node form and submit the task node form using Java code:

javaCopy codeimport org.activiti.engine.*;
import org.activiti.engine.form.TaskFormData;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

import java.util.HashMap;
import java.util.Map;

public class ActivitiDemo {

    public static void main(String[] args) {
        // 创建Activiti引擎配置
        ProcessEngineConfiguration cfg = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .setJdbcDriver("com.mysql.jdbc.Driver")
                .setJdbcUrl("jdbc:mysql://localhost:3306/activiti?useSSL=false")
                .setJdbcUsername("root")
                .setJdbcPassword("root")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);

        // 创建Activiti引擎对象
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 启动流程实例
        RuntimeService runtimeService = processEngine.getRuntimeService();
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("myProcess");

        // 获取任务节点并获取任务表单
        TaskService taskService = processEngine.getTaskService();
        Task task = taskService.createTaskQuery()
                .processInstanceId(processInstance.getId())
                .singleResult();
        TaskFormData taskFormData = form

Please continue

Information such as data binding, form type, form properties, and so on. Once you have the form, you can use it in your business processes.

The following is sample code using Java code to get the task node form and submit the task node form (continued):

javaCopy code        // 获取任务节点并获取任务表单
        TaskService taskService = processEngine.getTaskService();
        Task task = taskService.createTaskQuery()
                .processInstanceId(processInstance.getId())
                .singleResult();
        TaskFormData taskFormData = formService.getTaskFormData(task.getId());

        // 提交任务节点表单
        FormService formService = processEngine.getFormService();
        Map<String, String> formProperties = new HashMap<>();
        formProperties.put("name", "张三");
        formProperties.put("age", "20");
        formService.submitTaskFormData(task.getId(), formProperties);
    }
}

This code uses the Activiti engine configuration to create an Activiti engine object and uses the Activiti to run the service startup process instance. Then use the Activiti task service to query the task node and obtain the task form, and use the Activiti form service to submit the task node form. At the end of the code, shut down the Activiti engine.

Please explain the form properties and variable types in detail

In Activiti, form properties refer to elements in a form, such as text boxes, drop-down boxes, date pickers, etc. Each form property has a variable type that represents the data type of the form property, such as string, integer, date, and so on. The setting of the variable type can affect the data format and input validation of the form properties.

The following are the commonly used form properties and variable types in Activiti:

1. Text box: Used to enter text information, the variable type can be set to string, integer, decimal, date, etc.
2. Drop-down box: Used to select a fixed value, the variable type can be set to string, integer, enumeration, etc.
3. Radio boxes and checkboxes: Used to select one or more fixed values, the variable type can be set to string, integer, enumeration, etc.
4. Date picker: Used to select a date, the variable type can be set to date or string.
5. Upload File: Used to upload a file, the variable type can be set to file or string.

In Activiti Designer, you can set the data type of a form property by setting the Variable Type property of the form property. When creating a form manually, the corresponding data type can be used in HTML or JavaScript to implement data validation and formatting.

In summary, form properties and variable types are very important in Activiti to collect and present business data, validate and format it. When creating a form, you need to select the appropriate form properties and variable types according to your business needs to ensure the availability and reliability of the form.

Here is the example code to create a text box and drop-down box using HTML code and set their variable types:

htmlCopy code<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Activiti表单示例</title>
</head>
<body>
    <form id="form1">
        <div>
            <label for="name">姓名：</label>
            <input type="text" name="name" id="name" datatype="s" nullmsg="姓名不能为空">
        </div>
        <div>
            <label for="gender">性别：</label>
            <select name="gender" id="gender" datatype="n" nullmsg="性别不能为空">
                <option value="1">男</option>
                <option value="2">女</option>
            </select>
        </div>
    </form>
</body>
</html>

This code creates a form with a text box and a drop-down box. The variable type of the text box is string (datatype=”s”), and the variable type of the drop-down box is integer (datatype=”n”). When you enter text and select drop-down boxes, the data is validated and formatted based on the variable type.

Please continue

Here is sample code that uses JavaScript code to set the form property variable type:

javascriptCopy code<script>
    $(function() {
        $("#name").textbox({
            required: true,
            validType: 'string'
        });
        $("#gender").combobox({
            required: true,
            valueField: 'value',
            textField: 'text',
            data: [
                {value: 1, text: '男'},
                {value: 2, text: '女'}
            ]
        });
    });
</script>

This code creates a text box and a drop-down box using the jQuery library, and sets their properties using textbox and combobox plugins. Among them, the validType property of the text box is set to “string”, the valueField property of the drop-down box is set to “value”, and the textField property is set to “text”. The setting of these properties can affect the data type and formatting of the form properties.

In actual business process development, it is necessary to select appropriate form properties and variable types according to business needs, and use corresponding HTML or JavaScript code to implement data binding, style, and interaction of forms. Proficiency in setting form properties and variable types is key to business process development.

Please continue

In Activiti, form variables can be used in the following ways:

1. Define form properties in the process definition file (BPMN file): You can use form properties in the BPMN file to define variable names, variable types, form property IDs, etc. In this way, when a process instance is started in the Activiti engine, form variables are automatically created and passed to the form.

Here is sample code that defines form properties in a BPMN file:

xmlCopy code<userTask id="task1" name="任务1">
  <extensionElements>
    <activiti:formProperty id="name" name="姓名" type="string" />
    <activiti:formProperty id="gender" name="性别" type="enum">
      <activiti:value id="1" name="男" />
      <activiti:value id="2" name="女" />
    </activiti:formProperty>
  </extensionElements>
</userTask>

2. Use form variables in Java code: Form variables can be obtained and submitted using the Activiti task service or the form service. When getting form variables, you can use the getVariable or getVariableLocal methods to get the form variables for a task or process instance. When submitting a form variable, you can use the setVariable or setVariableLocal methods to submit form variables for a task or process instance.

Here is the sample code to get and submit form variables using Java code:

javaCopy code// 获取任务节点表单变量
TaskService taskService = processEngine.getTaskService();
Task task = taskService.createTaskQuery().taskId("task1").singleResult();
String name = (String) taskService.getVariable(task.getId(), "name");
int gender = (Integer) taskService.getVariable(task.getId(), "gender");

// 提交任务节点表单变量
Map<String, Object> variables = new HashMap<>();
variables.put("name", "张三");
variables.put("gender", 1);
taskService.complete(task.getId(), variables);

In this code, use the Activiti task service to get the task node form variable, use the getVariable method to get the form variable, and convert it according to the variable type. When submitting a task node form variable, use the Map object to set the form variable and call the complete method to submit the form variable.

Please continue

3. Use form variables in JavaScript code: Form variables can be obtained and submitted using the Activiti Forms API. When getting a form variable, you can use the getValue method to get the value of the form element. When submitting form variables, you can use the submit method to submit form data.

Here is sample code to get and submit form variables using JavaScript code:

javascriptCopy code// 获取任务节点表单变量
var name = $("#name").textbox("getValue");
var gender = $("#gender").combobox("getValue");

// 提交任务节点表单变量
var form = new FormData($("#form1")[0]);
$.ajax({
    url: "submit",
    type: "POST",
    data: form,
    processData: false,
    contentType: false,
    success: function() {
        console.log("表单提交成功");
    },
    error: function() {
        console.log("表单提交失败");
    }
});

In this code, the jQuery library is used to get the value of the form element and the FormData object is used to submit the form data. When submitting form data, use the ajax method to submit the data and set the processData and contentType properties to false to support file upload and binary data transfer. After you submit the form data, you can take appropriate actions based on the submission results.

In conclusion, in Activiti, form variables can be used in a variety of ways and choose the right one according to your business needs. Proficiency in the use of form variables can improve the efficiency and quality of business process development.

Please continue

In addition to the above methods, Activiti also provides some advanced features, such as dynamic forms, form verification, form linkage, etc. These features can make the use of forms more flexible and intelligent.

The following are advanced form features commonly used in Activiti:

1. Dynamic forms: Dynamic forms can dynamically generate different form elements according to different process instances or task nodes. Dynamic forms can be implemented using JavaScript or other scripting languages. Dynamic forms in Activiti can be implemented by extending elements, listeners, and external services.
2. Form validation: Form checks validate data entered in a form and prompt for error information before the form is submitted. Form validation can be implemented using Activiti’s form validation plugin or third-party form validation libraries.
3. Form linkage: Form linkage can realize the linkage and conditional display of form elements according to the relationship between different form elements. For example, after selecting a drop-down box option, show or hide other form elements based on the value of the option. Form linkage can be implemented using JavaScript or other scripting languages.

In the actual business process development, it is necessary to select appropriate form features according to business requirements, and use corresponding technologies to realize form dynamic, checksum, and linkage. When working with dynamic forms, you need to pay attention to the security and performance of the form. When using form validation, you need to consider different form elements and validation rules, and provide friendly error messages. When using form linkage, it is necessary to design the relationship between form elements and provide a smooth user experience.

In conclusion, in Activiti, forms are an important part of business process development, and mastering the advanced features of forms can improve the efficiency and quality of business process development.

Please explain the Activiti event type in detail

In Activiti, event types refer to various types of events that occur during process execution, including process start, end, task assignment, task completion, variable update, etc. Activiti supports multiple event types and provides a rich event listener interface to execute custom business logic when events occur.

The following are the types of events commonly used in Activiti:

1. Start event: Indicates the type of event that is triggered when a process instance starts. At the beginning of the process, you can use the start event to trigger custom business logic, such as creating process instances, initializing variables, and so on.
2. End event: Represents the type of event triggered when an instance of the process is triggered. At the end of the process, you can use the End Event to trigger customized business logic, such as saving process instance data, sending email notifications, and so on.
3. Task assignment event: Represents the type of event triggered when a task is assigned. When assigning tasks, you can use Task Assignment Events to trigger customized business logic, such as sending message notifications and recording task logs.
4. Task complete event: The type of event that is triggered when the task is completed. When a task is completed, you can use Task Complete Event to trigger custom business logic, such as updating task data, sending message notifications, and so on.
5. Variable update event: indicates the type of event that is triggered when the variable is updated. When variables are updated, you can use variable update events to trigger custom business logic, such as saving variable data, sending message notifications, and so on.
6. Custom event: Represents a custom event type, which can be used in a process definition file (BPMN file). When a custom event fires, you can use a custom listener interface to execute business logic.

In Activiti, you can implement complex business logic by extending event types and event listener interfaces. For example, in a task completion event, you can use Java code to update task data in the database, send email notifications, and so on. In variable update events, you can use JavaScript code to dynamically generate form elements, validate form data, and more.

In summary, in Activiti, event types are key to automating business processes. Mastering event types and event listener interfaces can make business process development more flexible and intelligent.

Please explain in detail how to implement and configure event listeners

In Activiti, you can implement an event listener interface to listen for various event types that occur during process execution and execute custom business logic when events occur. The event listener interface includes the following methods:

1. startEventReceived: This method is called when the process start event fires.
2. endEventReceived: This method is called when the end-of-process event fires.
3. taskAssigned: This method is called when the task assignment event fires.
4. taskCompleted: This method is called when the task completion event fires.
5. variableUpdated: This method is called when the variable update event fires.

Activiti provides a variety of event listener interfaces, including Java class listeners, expression listeners, and external listeners. Among them, the Java class listener is the most commonly used one, and the listener can be implemented by implementing the Java class interface.

The following is sample code that implements a Java class listener:

javaCopy codepublic class MyTaskListener implements TaskListener {

    @Override
    public void notify(DelegateTask delegateTask) {
        // 在任务分配或完成事件触发时执行业务逻辑
        System.out.println("任务ID：" + delegateTask.getId());
        System.out.println("任务名称：" + delegateTask.getName());
        System.out.println("任务分配人：" + delegateTask.getAssignee());
    }

}

In this code, the TaskListener interface is implemented and the notify method is overridden. In this method, you can obtain information such as task ID, task name, and task assignee, and execute the corresponding business logic. For example, saving task information to a database, sending email notifications, and so on.

Activiti also requires event listeners to be configured in the process definition file (BPMN file) for it to take effect. In BPMN files, task listeners can be configured using the extensionElements element and the activiti:taskListener element.

The following is sample code to configure the task listener in a BPMN file:

xmlCopy code<userTask id="task1" name="任务1">
  <extensionElements>
    <activiti:taskListener event="create" class="com.example.MyTaskListener" />
  </extensionElements>
</userTask>

In this code, a task listener is configured with the activiti:taskListener element and the event type and listener class name are specified. When a task assignment or completion event fires, the notify method of the MyTaskListener class is called.

In summary, in Activiti, you can implement the event listener interface and configure the listener in the BPMN file to implement the monitoring and processing of various event types during process execution. Mastering how to implement and configure event listeners can improve the efficiency and quality of business process development.

Please explain in detail how to use JavaDelegate and ExecutionListener

In Activiti, JavaDelegate and ExecutionListener are two important interfaces for handling tasks and events during process execution.

The JavaDelegate interface is used to handle the execution of task nodes. When the task node is executed, you can implement the JavaDelegate interface and write Java code to handle the business logic of the task node. The JavaDelegate interface includes an execute method for executing Java code.

The following is sample code that implements the JavaDelegate interface:

javaCopy codepublic class MyJavaDelegate implements JavaDelegate {

    @Override
    public void execute(DelegateExecution delegateExecution) {
        // 在任务节点执行时执行业务逻辑
        String name = (String) delegateExecution.getVariable("name");
        String gender = (String) delegateExecution.getVariable("gender");
        System.out.println("姓名：" + name);
        System.out.println("性别：" + gender);
    }

}

In this code, the JavaDelegate interface is implemented and the execute method is overridden. In this method, the process variables can be obtained through the DelegateExecution object and the corresponding business logic can be executed. For example, saving process variables to a database, sending message notifications, and so on.

The ExecutionListener interface is used to handle the execution of process events. During process execution, you can write Java code to handle the business logic of process events by implementing the ExecutionListener interface. The ExecutionListener interface includes the following three methods:

1. start: The method is called when the process start event fires.
2. end: The method is called when the end-of-process event fires.
3. take: This method is called when the process transition event fires.

The following is sample code that implements the ExecutionListener interface:

javaCopy codepublic class MyExecutionListener implements ExecutionListener {

    @Override
    public void notify(DelegateExecution delegateExecution) {
        // 在流程事件触发时执行业务逻辑
        String eventName = delegateExecution.getEventName();
        String processInstanceId = delegateExecution.getProcessInstanceId();
        System.out.println("事件名称：" + eventName);
        System.out.println("流程实例ID：" + processInstanceId);
    }

}

In this code, the ExecutionListener interface is implemented and the notify method is overridden. In this method, you can get the event name and process instance ID through the DelegateExecution object and execute the corresponding business logic. For example, saving event information to a database, sending email notifications, and so on.

In Activiti, JavaDelegate and ExecutionListener interfaces can be configured in a process definition file (BPMN file). In a BPMN file, the implementation class of the interface can be configured using the activiti:class element and the activiti:executionListener element.

The following is sample code for configuring the JavaDelegate and ExecutionListener interfaces in a BPMN file:

xmlCopy code<serviceTask id="task1" name="任务1" activiti:class="com.example.MyJavaDelegate" />

<process id="myProcess" name="我的流程">
  <extensionElements>
    <activiti:executionListener event="start" class="com.example.MyExecutionListener" />
  </extensionElements>
  ...
</process>

In this code, an implementation class for the JavaDelegate interface is configured using the activiti:class element and the class name of the implementation class is specified. When the task node executes, the execute method of the MyJavaDelegate class is called.

Use activiti in the process element

Please continue

The :executionListener element configures an implementation class for the ExecutionListener interface and specifies the event type and class name of the implementation class. When the process start event fires, the start method of the MyExecutionListener class is called.

In summary, in Activiti, you can implement the handling of task nodes and process events by implementing the JavaDelegate and ExecutionListener interfaces, and configuring the implementation classes of the interfaces in the BPMN file. Mastering the use of JavaDelegate and ExecutionListener interfaces can improve the efficiency and quality of business process development.

Please explain the configuration and use of service tasks in detail

In Activiti, a service task is a special task node that calls external services such as Java classes or web services. In the service task node, you can call an external service by implementing the JavaDelegate interface or using a class such as WebServiceTask provided by Activiti, and save the execution result as a process variable, or pass it to the next task node through output parameters.

The following is how to configure and use service tasks:

1. Configure the service task node

In a BPMN file, you can configure a service task node using the serviceTask element and specify a service class or a WebServiceTask class. For example:

xmlCopy code<serviceTask id="serviceTask1" name="服务任务1" activiti:class="com.example.MyServiceTask" />

In this code, a Java class is configured with the activiti:class element to handle the business logic of the service task node.

2. Implement the service class

You can implement the business logic of the service task by implementing the JavaDelegate interface and overriding the execute method. For example:

javaCopy codepublic class MyServiceTask implements JavaDelegate {

    @Override
    public void execute(DelegateExecution execution) {
        // 调用外部服务，处理业务逻辑
        String input = (String) execution.getVariable("input");
        String output = MyExternalService.process(input);
        execution.setVariable("output", output);
    }

}

In this code, the JavaDelegate interface is implemented and the external service is called in the execute method, saving the execution result as a process variable.

3. Configure WebServiceTask

In addition to implementing the JavaDelegate interface, web services can be invoked using the WebServiceTask class provided by Activiti. In the BPMN file, you can configure the WebServiceTask node with the serviceTask element and specify the service address and input and output parameters. For example:

xmlCopy code<serviceTask id="serviceTask2" name="WebService任务" activiti:type="webService">
  <extensionElements>
    <activiti:field name="wsdl" stringValue="http://localhost:8080/HelloService?wsdl" />
    <activiti:field name="operation" stringValue="sayHello" />
    <activiti:in source="name" target="name" />
    <activiti:out sourceExpression="${result}" target="result" />
  </extensionElements>
</serviceTask>

In this code, the task type is specified as webService using the activiti:type element, and the service address and operation name are specified using the activiti:field element. At the same time, input and output parameters are specified using activiti:in and activiti:out elements.

In summary, in Activiti, a service task is a special task node that is used to invoke external services. By implementing the JavaDelegate interface or using the WebServiceTask class, it is convenient to call a Java class or web service and save the execution result as a process variable, or pass it to the next task node through output parameters. Mastering how to configure and use service tasks can improve the automation and scalability of business processes.

Please explain the integration of Java classes and expressions in detail

In Activiti, Java classes and expressions can be used to handle logic such as conditional judgment of task nodes and gateways. Java classes and expressions are integrated as follows:

1. Use Java classes

You can use Java classes to handle logic such as conditional judgment by implementing the JavaDelegate interface and specifying the implementation class in the configuration of the task node or gateway.

The following is sample code that implements conditional judgment using Java classes:

javaCopy codepublic class MyCondition implements JavaDelegate {

    @Override
    public void execute(DelegateExecution execution) {
        // 获取流程变量
        String gender = (String) execution.getVariable("gender");
        // 判断流程变量
        if ("male".equals(gender)) {
            execution.setVariable("result", "男性");
        } else if ("female".equals(gender)) {
            execution.setVariable("result", "女性");
        } else {
            execution.setVariable("result", "未知性别");
        }
    }

}

In this code, the JavaDelegate interface is implemented and the execute method is overridden. In this method, you can obtain the process variables through the DelegateExecution object, and set the process variables according to the conditional judgment results. For example, in this example, the value of the result variable is set based on the value of the gender variable.

In the configuration of a task node or gateway, you can use the activiti:class element to specify the class name of a Java class. For example:

xmlCopy code<sequenceFlow id="flow1" sourceRef="task1" targetRef="gateway1">
  <conditionExpression xsi:type="tFormalExpression">
    <![CDATA[${myCondition}]]>
  </conditionExpression>
</sequenceFlow>

In this code, the conditional expression is specified using the conditionExpression element and the Java class MyCondition is referenced using the expression ${myCondition}. During the process execution, the execute method of the MyCondition class will be called to execute the business logic of conditional judgment.

2. Use expressions

You can use expressions in the configuration of task nodes or gateways to handle logic such as conditional judgment. Activiti supports expression languages such as JUEL, JavaScript, and Groovy.

The following is sample code that uses expressions to implement conditional judgment:

xmlCopy code<sequenceFlow id="flow1" sourceRef="task1" targetRef="gateway1">
  <conditionExpression xsi:type="tFormalExpression">
    <![CDATA[${gender == 'male'}]]>
  </conditionExpression>
</sequenceFlow>

In this code, the conditional expression is specified using the conditionExpression element, and the expression ${gender == ‘male’} is used to determine whether the value of the gender variable is male. If the condition is true, the task node or gateway to which the connection points is executed.

In summary, in Activiti, you can use Java classes and expressions to handle logic such as conditional judgment of task nodes and gateways. By implementing the JavaDelegate interface or using expressions, you can easily implement custom logic and improve the efficiency and quality of business process development.

Please explain in detail the use of Spring integration with Activiti

In practice, it is often necessary to integrate Activiti into the Spring framework to manage resources such as Spring Beans, transactions, data sources, and so on. Activiti provides Spring modules that make it easy to integrate Activiti into the Spring framework.

Here are the steps to integrate with Activiti using Spring:

1. Add Spring and Activiti dependencies

You need to add the following dependencies to the POM .xml file of the project:

xmlCopy code<dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-spring</artifactId>
    <version>${activiti.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring.version}</version>
</dependency>

where ${activiti.version} and ${spring.version} are the version numbers of Activiti and Spring.

2. Configure Spring Beans

In the Spring configuration file, you need to configure the following Spring Beans:

• ProcessEngineConfiguration: Used to configure the Activiti engine.
• ProcessEngineFactoryBean: Used to create the ProcessEngine object.
• RepositoryService, RuntimeService, TaskService, IdentityService, HistoryService: Used to manage services such as process definitions, process instances, tasks, users, and historical data.
• DataSource: Used to configure the database connection pool.

Here’s an example of a simple Spring configuration file:

xmlCopy code<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:activiti="http://www.activiti.org/schema/activiti-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.activiti.org/schema/activiti-spring
                           http://www.activiti.org/schema/activiti-spring.xsd">

    <!-- 配置Activiti引擎 -->
    <activiti:annotation-driven />
    <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
        <property name="dataSource" ref="dataSource" />
        <property name="transactionManager" ref="transactionManager" />
        <property name="databaseSchemaUpdate" value="true" />
        <property name="jobExecutorActivate" value="false" />
    </bean>

    <!-- 配置数据源和事务管理器 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/activiti" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 配置服务 -->
    <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
    <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
    <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
    <bean id="identityService" factory-bean="processEngine" factory-method="getIdentityService" />
    <bean id="historyService" factory-be

Please continue

an=”processEngine” factory-method=”getHistoryService” />

phpCopy code<!-- 创建ProcessEngine对象 -->
<bean id="processEngine" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="processEngineConfiguration" />
    <property name="targetMethod" value="buildProcessEngine" />
</bean>

</beans> “`

In this configuration file, use the activiti:annotation-driven element to enable Activiti annotation support. Use the SpringProcessEngineConfiguration class to configure the Activiti engine, including data sources, transaction managers, and database schema update policies. Use the MethodInvokingFactoryBean class to create a ProcessEngine object and set the service object to a Spring Bean for use in your application.

3. Use Spring to manage process definitions and process instances

When using Spring Integration Activiti, you can use Spring’s IoC containers to manage process definitions and process instances.

For example, a process definition named myProcess is defined in the Spring configuration file:

xmlCopy code<bean id="myProcess" class="org.activiti.engine.repository.ProcessDefinition">
    <constructor-arg value="myProcess" />
    <constructor-arg value="classpath:myProcess.bpmn20.xml" />
</bean>

In the application, the process definition can be obtained by injecting RepositoryService, for example:

javaCopy code@Service
public class MyService {

    @Autowired
    private RepositoryService repositoryService;

    public void startProcess() {
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
            .processDefinitionKey("myProcess").latestVersion().singleResult();
        // 启动流程实例
        runtimeService.startProcessInstanceById(processDefinition.getId());
    }

}

In this example, the process definition is queried using the RepositoryService’s createProcessDefinitionQuery method and the key of the process definition is specified through the processDefinitionKey method. After obtaining the process definition, you can start the process instance through the startProcessInstanceById method of the runtimeService.

In short, in practical applications, using Spring Integration Activiti can easily manage the Activiti engine and process definition, improve development efficiency and maintainability. In Spring, you can use IoC containers to manage Activiti’s service objects, and you can use techniques such as annotations and AOP to simplify the development and testing of business logic.

Please explain in detail the Exclusive Gateway

Exclusive gateway, also known as mutually exclusive gateway, is a type of gateway commonly used in BPMN flowcharts, which is used to judge conditions and select different paths according to conditions to achieve process control.

Exclusive gateways behave like an if-else structure, where only one of the paths can be selected for circulation when the conditions are met. Exclusive gateways have the following characteristics:

• There is only one branch that goes into the process, but there are multiple exits.
• You can use conditional expressions or scripts to conditionally determine exits.
• Only one exit can be selected for circulation, and if multiple conditions are true, the first exit evaluated as true will be selected.

In BPMN, the symbol for an exclusive gateway is a diamond with an X in the middle to indicate mutual exclusion. Inside the diamond next to the gateway, you can use a conditional expression or script to represent the condition, as shown in the following image:

For example, in a purchase requisition process, if the application amount is less than 1000,<> yuan, it will be directly approved, otherwise it needs to be approved by the superior. You can use the exclusive gateway to implement conditional judgment and select different approval paths based on the application amount, as shown in the following figure:

In this example, an exclusive gateway is used, and different paths are selected depending on the size of the application amount. If the application amount is less than 1000,<> yuan, it will be transferred to the Purchase Approved task, otherwise it will be transferred to the Superior Approval task.

In short, the exclusive gateway is a commonly used gateway type in BPMN flowcharts for condition judgment and process control. In practical applications, exclusive gateways can realize complex branch processes and improve the flexibility and maintainability of business processes.

Please explain Parallel Gateway in detail

Parallel Gateway is a type of gateway in BPMN flowcharts that is used to create parallel branches in a process to perform multiple tasks or activities at the same time.

Parallel gateways behave like branching structures in multithreading, where multiple paths can be selected for parallel flow when conditions are met. Parallel gateways have the following characteristics:

• There can be multiple incoming branches or multiple exit branches.
• All incoming branches must arrive and meet the conditions in order to flow to all exit branches at the same time.
• You can use conditional expressions or scripts to conditionally determine exits.

In BPMN, the symbol of the parallel gateway is also a diamond, without any symbol in between, as shown in the following figure:

For example, in an order processing process, both order review and inventory processing are required. You can use a parallel gateway to create two parallel branches to perform two tasks at the same time, as shown in the following diagram:

In this example, a parallel gateway is used, two parallel branches are created, and the Order Review and Inventory Processing tasks are performed simultaneously. When both tasks are completed, the process continues with subsequent tasks.

In summary, a parallel gateway is a type of gateway commonly used in BPMN flowcharts to create parallel branches that perform multiple tasks or activities simultaneously. In practical applications, parallel gateways can be used to realize parallel processing and parallel flow to improve the efficiency and response speed of business processes.

Please explain Parallel Gateway in detail

Parallel Gateway is a type of gateway in BPMN flowcharts that is used to create parallel branches in a process to perform multiple tasks or activities at the same time.

Parallel gateways behave like branching structures in multithreading, where multiple paths can be selected for parallel flow when conditions are met. Parallel gateways have the following characteristics:

• There can be multiple incoming branches or multiple exit branches.
• All incoming branches must arrive and meet the conditions in order to flow to all exit branches at the same time.
• You can use conditional expressions or scripts to conditionally determine exits.

In BPMN, the symbol of the parallel gateway is also a diamond, without any symbol in between, as shown in the following figure:

For example, in an order processing process, both order review and inventory processing are required. You can use a parallel gateway to create two parallel branches to perform two tasks at the same time, as shown in the following diagram:

In this example, a parallel gateway is used, two parallel branches are created, and the Order Review and Inventory Processing tasks are performed simultaneously. When both tasks are completed, the process continues with subsequent tasks.

In summary, a parallel gateway is a type of gateway commonly used in BPMN flowcharts to create parallel branches that perform multiple tasks or activities simultaneously. In practical applications, parallel gateways can be used to realize parallel processing and parallel flow to improve the efficiency and response speed of business processes.

Please explain in detail the Inclusive Gateway

Inclusive Gateway is a type of gateway in BPMN flowcharts, which is used to create inclusion branches in the process, that is, flow to multiple egresses at the same time when multiple conditions can be met.

The containing gateway behaves like an if-else-if structure, where multiple paths can be selected for parallel flow when the conditions are met. The included gateway has the following characteristics:

• There can be multiple incoming branches or multiple exit branches.
• All incoming branches will be executed, and branches that meet the conditions will flow to the exit at the same time.
• You can use conditional expressions or scripts to conditionally determine exits.

In BPMN, the symbol containing the gateway is a diamond with a circle in the middle indicating containment. Inside the diamond next to the gateway, you can use a conditional expression or script to represent the condition, as shown in the following image:

For example, in an order processing process, different shipping methods need to be offered in different regions. You can use the included gateway to implement conditional judgment and select different transportation methods according to the region, as shown in the following figure:

In this example, a containment gateway is used, with different modes of transportation selected depending on the region. If the region is Asia, it will flow to both the Air and Sea freight tasks, and if the region is Europe, it will flow to the Rail Transport task.

In summary, an include gateway is a type of gateway commonly used in BPMN flowcharts to create include branches and flow to multiple egresses at the same time. In practical applications, the inclusion gateway can realize complex conditional processes and improve the flexibility and maintainability of business processes.

Please explain in detail how to query historical data

In Activiti, you can use HistoryService to query historical data, including the history of process instances, tasks, variables, etc. HistoryService is a service interface in Activiti that provides methods for querying historical data.

Query historical process examples:

You can query historical process instances using the following methods:

javaCopy codeList<HistoricProcessInstance> list = historyService.createHistoricProcessInstanceQuery().processDefinitionKey(processDefinitionKey).list();

where processDefinitionKey is the key of the process definition, and the list() method is used to query all historical process instances that meet the conditions. You can use other query methods, such as singleResult() for a single result, count() for the number of historical process instances that meet the criteria, and so on.

Query historical tasks:

You can query historical tasks using the following methods:

javaCopy codeList<HistoricTaskInstance> list = historyService.createHistoricTaskInstanceQuery().processDefinitionKey(processDefinitionKey).list();

where processDefinitionKey is the key of the process definition, and the list() method is used to query all historical tasks that meet the conditions. You can use other query methods, such as singleResult() to query a single result, count() to query the number of historical tasks that meet the criteria, etc.

Query historical variables:

You can query historical variables using the following methods:

javaCopy codeList<HistoricVariableInstance> list = historyService.createHistoricVariableInstanceQuery().processDefinitionKey(processDefinitionKey).list();

where processDefinitionKey is the key of the process definition, and the list() method is used to query all historical variables that meet the condition. You can use other query methods, such as singleResult() for a single result, count() for the number of historical variables that meet the criteria, and so on.

Query details of historical process instances, tasks, variables:

You can query the details of historical process instances, tasks, variables using the following methods:

javaCopy codeHistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
HistoricTaskInstance historicTaskInstance = historyService.createHistoricTaskInstanceQuery().taskId(taskId).singleResult();
HistoricVariableInstance historicVariableInstance = historyService.createHistoricVariableInstanceQuery().variableName(variableName).singleResult();

Among them, processInstanceId is the ID of the historical process instance, taskId is the ID of the historical task, and variableName is the name of the historical variable. The singleResult() method is used to query a single result.

In summary, using HistoryService you can query historical data in Activiti, including the history of historical process instances, tasks, variables, etc. The query methods are diverse, which can be selected and combined according to actual needs to achieve flexible and efficient historical data query.

Please explain in detail how to perform flowchart tracking and auditing

In Activiti, you can use the flowchart tracking and audit functions to view the detailed information of the process during execution, including the operation trajectory of the flowchart, the current node, the execution time of the node, etc., so that users can monitor the implementation of the process in real time.

Activiti provides a variety of ways to implement flowchart tracking and auditing functions, including Activiti Explorer, Activiti Modeler, Activiti REST, and more. The following describes how to use each of these methods.

1. Activiti Explorer

Activiti Explorer is an official web-based management tool provided by Activiti that provides flowchart tracking and auditing capabilities. Here’s how to use it:

• Open Activiti Explorer, select the process instance or task you want to view, and click the “Diagrams” button.
• The browser will display the flow chart, and you can view the node where the current process is located, the node execution time, and other information.
• Click the process node to view the details of the node, as shown in the following figure:

2. Activiti Modeler

Activiti Modeler is Activiti’s official web-based process designer, which also provides flowchart tracking and auditing capabilities. Here’s how to use it:

• Open Activiti Modeler, select the process definition you want to view, and click the “Diagram” button.
• The browser will display the flow chart, and you can view the node where the current process is located, the node execution time, and other information.
• Click a process node to view the details of that node.
• You can use the History panel to view process history and audit information, as shown in the following image:

3. Activiti REST

Activiti REST is the official RESTful API provided by Activiti, which also provides flowchart tracking and auditing capabilities. Here’s how to use it:

• Use GET requests to get a history of process instances or tasks, including flowcharts and node information.
• You can use flowchart parsing tools, such as BPMN.js, to parse the flowchart and display node information.
• You can use Java or other programming languages to call the Activiti REST API to implement custom flowchart tracking and auditing capabilities.

In short, Activiti provides a variety of ways to implement the process chart tracking and audit function, which is convenient for users to monitor the implementation of the process in real time and realize the visualization, traceability and auditability of the process. The use methods are diversified, and they can be selected and combined according to actual needs to achieve flexible and efficient flowchart tracking and auditing.

Please explain in detail how to manage and optimize process history data

Process historical data management and optimization is an important part of Activiti, which can optimize the performance and efficiency of the process, improve the maintainability and scalability of the process. In Activiti, process history data can be managed and optimized in the following ways:

1. Turn history on/off

You can turn process history on or off by setting the History property in the process definition. By default, Activiti records all historical data, including process instances, tasks, variables, etc. If you only need to record part of the historical data, you can set the history property.

For example, set the history property to “none”, which means that no historical data is recorded; Set the history property to “activity”, which means that only the historical data of process instances and tasks is recorded, and other data such as variables are not recorded.

2. Set historical data retention policies

You can set the retention policy for historical data by setting the historyCleanup property in the Activiti configuration file. By default, Activiti keeps all historical data permanently, but this takes up a lot of storage space. If you need to optimize performance and storage space, you can set a retention policy for historical data to clean up historical data regularly.

For example, setting the historyCleanup property to true means that the automatic cleanup of historical data is enabled. Set the historyCleanupBatchSize property, which represents the amount of historical data cleaned each time; Set the historyCleanupCycle property, which represents the cleanup period of historical data.

3. Use HistoricData to improve query performance

You can use the HistoricData object to improve the performance of querying historical data. The HistoricData object is an entity object in Activiti that stores historical data, corresponding to database tables. Through the HistoricData object, you can use the Criteria API, SQL query, etc. to efficiently query historical data.

For example, you can query historical process instances with the following code:

javaCopy codeHistoricProcessInstanceQuery query = historyService.createHistoricProcessInstanceQuery();
query.finished().orderByProcessInstanceEndTime().desc();
List<HistoricProcessInstance> list = query.list();

Among them, the finished() method is used to query the completed historical process instances, the orderByProcessInstanceEndTime() method is used to sort by the end time of the process instance, the desc() method is used to sort in descending order, and the list() method is used to query all historical process instances that meet the criteria.

In short, process historical data management and optimization is an important part of Activiti, which can improve the performance and efficiency of the process and reduce the storage space occupation. By turning history on/off, setting historical data retention policies, and using HistoricData, you can manage and optimize process historical data and improve the maintainability and scalability of business processes.

Please explain the REST API overview in detail

REST (Representational State Transfer) is a software architecture style based on the HTTP protocol, commonly used in the design and implementation of Web services. REST API refers to a web service interface based on REST architecture style, which uses GET, POST, PUT, DELETE and other request methods in the HTTP protocol to perform CRUD operations on web resources, providing a simple, flexible and extensible Web service design and implementation method.

In Activiti, a REST API interface is also provided, which can call the services of the Activiti engine through the HTTP protocol to realize the management and use of the Activiti engine. The Activiti REST API is implemented based on the Spring MVC framework, supports multiple data formats such as JSON and XML, and provides rich Web service interfaces, including process definitions, process instances, tasks, and historical data.

The Activiti REST API has the following features:

1. Based on HTTP protocol and REST architecture style, it is simple, flexible and extensible.
2. Support JSON, XML and other data formats, easy to integrate and call.
3. Provides rich web service interfaces, including process definitions, process instances, tasks, and historical data.
4. Support security authentication and authority control to ensure the security and reliability of the system.

Using the Activiti REST API, you can easily manage and use the Activiti engine, including starting the process, querying the process, completing tasks, querying historical data, etc., and can also be integrated into other systems to achieve system interconnection. At the same time, it is necessary to pay attention to the security and permission control of the Activiti REST API to avoid security vulnerabilities in the system.

Please explain the API endpoints and features in detail

In the Activiti REST API, each web service interface corresponds to an API endpoint, and by accessing the API endpoint, the corresponding function can be called to manage and use the Activiti engine. The following describes the common API endpoints and features of the Activiti REST API:

1. The process defines the API endpoint

• /repository/process-definitions: Query the list of process definitions.
• /repository/process-definitions/{processDefinitionId}: Queries the specified process definition information.
• /repository/process-definitions/{processDefinitionId}/start-form: Queries the process start form information.
• /repository/process-definitions/{processDefinitionId}/model: Query process definition model information.
• /repository/process-definitions/{processDefinitionId}/diagram: Query process definition diagram information.

2. Process instance API endpoint

• /runtime/process-instances: Starts the process instance.
• /runtime/process-instances/{processInstanceId}: Queries the specified process instance information.
• /runtime/process-instances/{processInstanceId}/diagram: Query process instance diagram information.
• /runtime/process-instances/{processInstanceId}/variables: Query process instance variable information.
• /runtime/process-instances/{processInstanceId}/activities: Query the current node information of the process instance.

3. Task API endpoint

• /runtime/tasks: Query the task list.
• /runtime/tasks/{taskId}: Queries the specified task information.
• /runtime/tasks/{taskId}/complete: Completes the task operation.
• /runtime/tasks/{taskId}/claim: The sign-off task operation.
• /runtime/tasks/{taskId}/form: Query task form information.
• /runtime/tasks/{taskId}/variables: Query task variable information.

4. Historical Data API endpoint

• /history/historic-process-instances: Queries a list of historical process instances.
• /history/historic-process-instances/{processInstanceId}: Queries the specified historical process instance information.
• /history/historic-task-instances: Query the list of historical tasks.
• /history/historic-task-instances/{taskId}: Queries the specified historical task information.
• /history/historic-variable-instances: Query the list of historical variables.
• /history/historic-variable-instances/{variableId}: Queries the specified history variable information.

In addition to the above common API endpoints and functions, the Activiti REST API also provides other web service interfaces, including process definition models, task operations, historical data queries, etc., and supports various data formats such as JSON and XML for easy integration and invocation. At the same time, it is necessary to pay attention to the security and permission control of the Activiti REST API to avoid security vulnerabilities in the system.

Please explain the use cases and examples in detail

Activiti can be applied to various business scenarios, such as process management, workflow, task management, approval process, etc. Here are a few Activiti use cases and examples to help you understand Activiti’s applications and implementations.

1. Purchase approval process

Suppose a company needs to purchase a batch of office equipment, and the procurement process includes: application for procurement, approval of procurement, procurement execution, acceptance of procurement and other steps. This process can be implemented using Activiti, and the procurement flow chart includes individual task nodes, task branches, task merging and other elements, which can be modeled using Activiti Designer. Purchase requisition and purchase acceptance forms can be designed using Activiti Modeler, and data from the procurement process can be queried and manipulated through the Activiti REST API.

2. Reimbursement process

Suppose a company needs to make a travel reimbursement, and the reimbursement process includes steps such as filling out the claim form, submitting the claim form, approving the claim form, financial payment, and so on. This process can be implemented using Activiti, and the reimbursement flow chart includes individual task nodes, task branches, task merging and other elements, which can be modeled using Activiti Designer. The form of the claim form can be designed using the Activiti Modeler, and the data of the reimbursement process can be queried and manipulated through the Activiti REST API.

3. Task management system

Suppose a company needs task management, and the task management system includes: creating tasks, assigning tasks, completing tasks, querying tasks and other functions. This task management system can be implemented using Activiti, which includes individual task nodes, task branches, task merging and other elements, which can be modeled using Activiti Designer. Task data can be queried and manipulated through the Activiti REST API, such as creating tasks, assigning tasks, completing tasks, and other operations.

The above are a few examples of using Activiti to help understand the application and implementation of Activiti in business. Modeling through Activiti Designer and Activiti Modeler, querying and operating through Activiti REST APIs can realize the application of various business scenarios such as process management, workflow, task management, and approval process.

Please explain version management for process definitions in detail

Version management of process definitions refers to the management of versions of process definitions, including operations such as creation, update, and deletion of versions, as well as management and query of different versions of process definitions.

In Activiti, each process definition has a unique key and version number, such as “myProcess:1”, where “myProcess” is the key of the process definition and the number “1” is the version number. When an update is made to a process definition, the version number, such as “myProcess:2”, is incremented to indicate that the process definition has been updated to version 2. At the same time, Activiti also supports managing and querying different versions of process definitions, such as querying the latest version of a specified key, querying a process definition with a specified version number, and other operations.

In Activiti Designer, process definitions can be deployed through the “Deploy” action, and the corresponding process definition is generated in the Activiti engine after deployment. During the modeling of process definitions, Activiti Designer can be used for version management, such as updating, saving, exporting, and so on. In the Activiti REST API, the version management interface of process definitions is also provided, such as querying process definition lists, querying process definition information, and querying process definition diagram information.

Through the version management of process definition, the refined management of process definition can be realized, which is convenient for version control and update, and improves the reliability and maintainability of the process. At the same time, it is necessary to pay attention to the specification and management of the version number defined by the process to avoid duplicate or confusing version numbers.

Please explain the process migration and upgrade in detail

Process migration and upgrade refers to the process of migrating process instances, tasks, historical data, etc. that have been deployed and run from the old version of the process definition to the new version of the process definition.

In actual business, with the change of business processes and the upgrading of requirements, the process definition may need to be updated or optimized, such as adding new task nodes, modifying task properties, and deleting unnecessary tasks. To ensure the normal operation of the process and the integrity of the historical data, you need to migrate or upgrade the running process instances and historical data.

In Activiti, process migrations and upgrades can be implemented in the following ways:

1. Use Activiti Designer for process updates and deployment

In Activiti Designer, you can use the Save as feature to save an old version of a process definition as a new version, then update and deploy it. After updating and deploying, the new version of the process definition overwrites the old version of the process definition, and new process instances and tasks are processed with the new version of the process definition.

2. Use the Activiti REST API for process migration and upgrade

In the Activiti REST API, you can use the “migrate-process-instances” interface for process migration, migrating old process instances to new versions of process definitions. During the migration process, task nodes need to be reassigned to ensure that the process instances can run normally. At the same time, it is also necessary to pay attention to the integrity and consistency of historical data to avoid data loss or chaos.

In summary, process migration and upgrade is an important way to manage and optimize process definitions and historical data, which can improve the reliability and maintainability of processes. In the process of process migration and upgrade, you need to pay attention to the consistency of the process and the integrity of the data to avoid abnormal process operation or data loss. At the same time, process definitions and historical data need to be backed up and stored in case they are needed.

Please explain permission management and authentication in detail

Permission management and authentication refers to the management of users and roles in the Activiti system, ensuring that users can only access the resources and data they have permissions to, and authenticating users to protect the security and reliability of the system.

In Activiti, permission management and authentication mainly include the following aspects:

1. User management and role management

Activiti supports the management and authorization of users and roles, and can add, modify, and delete users and roles through Activiti’s API interface and management interface. In Activiti, both users and roles can be given different permissions and access levels, and user access to process instances and tasks can be restricted.

2. Authentication and authorization

Activiti provides a Spring Security-based authentication and authorization mechanism that authenticates users and authorizes them based on their roles and permissions. You can use the default authentication and authorization mechanisms provided by Activiti, or you can customize the authentication and authorization mechanisms to meet specific business needs.

3. Database encryption

Activiti provides encryption function for database connection information, which can encrypt database connection information to ensure the security and reliability of the database. You can use the default encryption algorithm provided by Activiti, or you can customize the encryption algorithm to meet specific business needs.

Through permission management and authentication, the security and reliability of the Activiti system can be guaranteed, and unauthorized users and malicious attackers can be prevented from attacking and destroying the system. At the same time, it is also necessary to pay attention to the reasonable authorization and management of users and roles to avoid insufficient or excessive permissions, and ensure the smooth progress of the process and the integrity of historical data.

Review the core concepts and technologies

Activiti is an open source workflow engine based on the BPMN 2.0 standard, providing complete workflow management and execution capabilities. Here are Activiti’s core concepts and techniques:

1. Process definition: The process definition in Activiti refers to the flow chart in the BPMN2.0 specification, including process nodes, process connections, gateways and other elements.
2. Process instance: A process instance is a specific running instance of the process definition, including information such as which node is currently executed to and task status.
3. Task: A task is a specific node in a process instance that needs to be completed by the executor.
4. Historical data: Historical data refers to the history of the process, including information such as process instances, tasks, variables, etc.
5. Event listener: An event listener refers to an event listener that can listen to events and respond accordingly during process execution, such as task completion events and process end events.
6. Service tasks: Service tasks refer to tasks that need to execute Java code, which can be used to execute business logic, call external interfaces, and other operations.
7. Gateway: Gateway refers to the branch and merge nodes in the process, which can be branched and merged according to different conditions.
8. Spring integration: Activiti can integrate with the Spring framework, using features such as Spring’s dependency injection and AOP to manage processes.
9. REST API: Activiti provides a RESTful-based API that can manage and call processes through the API.

These are the core concepts and technologies of Activiti, and understanding them is the foundation for process management and execution with Activiti.

Please explain the discussion of practical application scenarios in detail

Activiti has a wide range of application scenarios, especially in business process management and execution, which can help enterprises optimize processes and improve efficiency, and improve the reliability and controllability of business processing. The following is a discussion of the practical application of Activiti:

1. Workflow management: Activiti can be used for various types of workflow management, such as leave requests, approval processes, contract management, order management, etc. Activiti’s process definition, tasks, event listeners and other functions can be used to standardize and automate business processes to improve work efficiency and accuracy.
2. E-commerce: In the field of e-commerce, Activiti can be used for the management and execution of business processes such as order management, logistics distribution, and after-sales service. Activiti’s service tasks, gateways and other functions can optimize and automate business processes to improve order processing efficiency and customer satisfaction.
3. Financial industry: In the financial industry, Activiti can be used for the management and execution of business processes such as risk management, approval process, reimbursement management, etc. Activiti’s event listener, gateway, and other functions can be used to monitor and control business processes to improve the security and reliability of business processing.
4. Healthcare: In the field of healthcare, Activiti can be used for the management and execution of business processes such as medical process management, medical record management, and medical expense management. Activiti’s tasks, service tasks and other functions can automate and optimize the medical process to improve the efficiency and quality of medical services.
5. Public services: In the field of government and public services, Activiti can be used for the management and execution of business processes such as public service process management, approval process, and administrative licensing. Activiti’s process definition, gateway and other functions can automate and optimize public service processes to improve the efficiency and quality of public services.

In summary, Activiti has a wide range of application scenarios and can be used for various types of business process management and execution to help enterprises improve work efficiency, reduce costs, and improve service quality. At the same time, when applying Activiti, customized development and optimization are required according to specific business needs to ensure the stability and reliability of the system.

Please explain in detail about extended learning resources and community support

Activiti has a strong community support and extended learning resources, here are some resources that can help you learn Activiti:

1. Official documentation: Activiti’s official website provides a wealth of documentation, including user guides, API references, development guides, etc. The official document details the various functions and application scenarios of Activiti, which is an important reference for learning and using Activiti.
2. Books: There are several books about Activiti, such as Activiti in Action and Activiti 5.x User Guide, which detail the various features and uses of Activiti, and are ideal for beginners and developers.
3. Video tutorials: There are many online video tutorials to help learn Activiti, for example, some video tutorials can be found on YouTube that cover various topics of Activiti, including how to use Activiti Designer, how to create process definitions, etc.
4. Blog: There are many active Activiti community blogs covering various topics of Activiti, including best practices, new features, case studies, and more. Follow the blog to get the latest Activiti technology updates and practical application experience.
5. Community support: Activiti has an active community of users, developers, and contributors. Community members can communicate and discuss through the forums, mailing lists, GitHub and other channels on the Activiti official website, share experiences and solve problems.

In summary, Activiti has a wealth of learning resources and community support to help developers and users better understand and apply Activiti. It should be noted that Activiti is an open source project that continues to develop and evolve, and needs to pay attention to the latest technical trends and version changes to ensure the stability and reliability of applications.