Getting Start With Thymeleaf

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 Thymeleaf tutorial, and you start by giving me a list of things to cover.

Of course! The following is a video tutorial outline based on the content of the Thymeleaf tutorial:

1. Thymeleaf Introduction What is Thymeleaf b. Features of Thymeleaf c. Thymeleaf comparison with other template engines
2. Thymeleaf Installation and Configuration a. Installing Thymeleaf b. Integrating Thymeleaf into the Spring Boot project c. Thymeleaf configuration items in detail
3. Thymeleaf basic syntax a. Thymeleaf namespace b. Property substitution c. Variable expression d. Selection expression e. Collection selection
4. Thymeleaf Process Control a. Conditional evaluation (if, unless) b. Loop traversal (th:each) c. Collection operations
5. Thymeleaf layout and fragments a. The concept of layout and fragments b. Thymeleaf layout template c. Thymeleaf fragment management d. Fragment parameter passing
6. Thymeleaf form processing a. Form elements are bound to Thymeleaf objects b. Form validation c. Handling form submissions
7. Thymeleaf integration with Spring Boot Thymeleaf autoconfiguration in Spring Boot b. View parsing using Thymeleaf in Spring Boot c. Handling exceptions with Thymeleaf
8. Thymeleaf Advanced Applications Customize Thymeleaf properties JavaScript inline in Thymeleaf c. Cache control in Thymeleaf d. Thymeleaf performance optimization
9. Thymeleaf Practical Case Study a. Case Introduction and Needs Analysis b. Design and implement page layout c. Implement data display and operation d. Form validation and submission processing e. Complete the development and testing of the entire case

This outline can serve as a basis for you to make Thymeleaf tutorials. During the actual production process, you can adjust it according to actual needs and audience feedback. Good luck with your video tutorial!

Please explain in detail what Thymeleaf is

Thymeleaf is a modern server-side Java templating engine for web and standalone environments. Its main goal is to bring elegant natural templates to your development workflow so that they display correctly in the browser and as static prototypes to increase development efficiency. Thymeleaf’s concise syntax is easy to read and write, so it is gaining popularity in the Java web development world.

Here are some of Thymeleaf’s key features:

1. Natural templates: Thymeleaf allows you to use plain HTML files as templates. This means that your templates can be opened and viewed directly in the browser without any additional server processing. This makes design and prototyping more efficient.
2. Powerful expression language: Thymeleaf has its own expression language called Thymeleaf Standard Expression. It allows you to work with various data types like variables, attributes, text, and more in your template.
3. Extensibility: Thymeleaf is very extensible and can extend its functionality by adding custom dialects. This means that you can create custom properties and functionality for the needs specific to your application.
4. Integration: Thymeleaf can be easily integrated with popular Java web frameworks such as Spring, JavaServer Faces, etc. Especially when integrating with Spring Boot, Thymeleaf offers a very clean setup and configuration.

Thymeleaf is primarily used in the view layer of web applications, processing dynamic data and generating HTML output. It integrates seamlessly with frameworks such as Spring MVC and Spring Boot to provide an elegant and efficient view solution for Java web development.

Please explain in detail how Thymeleaf compares to other templating engines

In discussing Thymeleaf’s comparison to other templating engines, we’ll focus on a few common templating engines: JavaServer Pages (JSP), FreeMarker, and Velocity. Here are some key differences between them:

1. Natural Templates:
   • Thymeleaf: A significant advantage of Thymeleaf is that it uses the concept of natural templates. This means that it can handle plain HTML files, which you can view directly in your browser without involving server-side processing. This greatly simplifies front-end and back-end collaboration, making prototyping more efficient.
   • JSP, FreeMarker, and Velocity: The template files of these templating engines often contain special or custom tags, which makes them impossible to display directly in the browser.
2. Syntax and readability:
   • Thymeleaf: Thymeleaf’s syntax is closer to HTML because it uses HTML attributes for data binding. This makes the template more readable and easy to understand.
   • JSP: The syntax of JSP includes special JSP tags, custom tag libraries, and scripts. This can cause the template to become cluttered and difficult to read.
   • FreeMarker and Velocity: These templating engines use special placeholder syntax (e.g. ${variable}). While this syntax is relatively simple, it is slightly less readable than Thymeleaf.
3. Integration:
   • Thymeleaf: Thymeleaf is very tightly integrated with the Spring framework, especially Spring Boot. Spring Boot provides automatic configuration for Thymeleaf, making the development process easier.
   • JSP: JSP integrates well with Java EE and Spring MVC. However, when using JSPs, additional configuration and setup are often required.
   • FreeMarker and Velocity: These templating engines can integrate with a variety of Java web frameworks, but may not be as tightly integrated with Spring as Thymeleaf.
4. Performance:
   • Thymeleaf: Thymeleaf’s performance is generally considered good, but may be slightly inferior compared to JSPs. However, Thymeleaf’s performance can be further improved by optimizing the configuration and use of caching strategies.
   • JSP: JSPs are compiled as servlets on the first request, so they perform better in subsequent requests.
   • FreeMarker and Velocity: The performance of these templating engines is generally considered fairly fast.

In conclusion, Thymeleaf is a modern templating engine whose natural templating, easy-to-read syntax, and tight integration with Spring make it non-beginner in Java web development

Please explain in detail how to install Thymeleaf

Installing Thymeleaf is actually adding it to your Java project. Here we will use Maven and Gradle as examples to show how to add Thymeleaf to the project.

First, make sure you’ve created a Java project that you can build with Maven or Gradle.

1. Use Maven: In your project’s pom.xml file, add the following dependencies to the dependencies> tag of <:

xmlCopy code<dependency>
    <groupId>org.thymeleaf</groupId>
    <artifactId>thymeleaf</artifactId>
    <version>3.0.12.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-java8time</artifactId>
    <version>3.0.4.RELEASE</version>
</dependency>

The version number may vary, please select the latest stable version according to the actual situation.

2. Use Gradle: In the project’s build.gradle file, add the following dependencies to the dependencies block:

groovyCopy codeimplementation 'org.thymeleaf:thymeleaf:3.0.12.RELEASE'
implementation 'org.thymeleaf.extras:thymeleaf-extras-java8time:3.0.4.RELEASE'

Again, please note that the version number may vary, choose the latest stable version according to the actual situation.

Once this is done, Maven or Gradle will automatically download and install Thymeleaf and its associated dependencies. Now you can start using Thymeleaf in your projects.

If you’re using a Spring Boot project, you can easily integrate Thymeleaf by simply adding an additional dependency:

For Maven projects, add in the <dependencies> tag of the pom.xml file:

xmlCopy code<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

For the Gradle project, add the dependencies code block in the build.gradle file:

groovyCopy codeimplementation 'org.springframework.boot:spring-boot-starter-thymeleaf'

This will automatically configure Thymeleaf and integrate it with the Spring Boot project. Now you’re ready to start using Thymeleaf to build the view layer of your web application.

Please explain in detail how to integrate Thymeleaf into the Spring Boot project

Integrating Thymeleaf into a Spring Boot project is as simple as adding the relevant dependencies and Spring Boot will automatically complete the configuration. Here are the detailed steps to add Thymeleaf to your Spring Boot project:

1. Create a new Spring Boot project, or use an existing project. You can create a new project using Spring Initializr, choosing Web and Thymeleaf as dependencies.
2. Add Thymeleaf dependencies. Add dependencies in your Maven or Gradle build file.spring-boot-starter-thymeleaf

For the Maven project, add the following to the tag of the pom.xml file:<dependencies>

xmlCopy code<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

For the Gradle project, add the following to the code block of the build.gradle file:dependencies

groovyCopy codeimplementation 'org.springframework.boot:spring-boot-starter-thymeleaf'

Once dependencies are added, Maven or Gradle will automatically download and install Thymeleaf and its associated dependencies. Spring Boot will automatically configure Thymeleaf and integrate it with the project.

3. Create a Thymeleaf template in your project. Create an HTML template file in the directory. Spring Boot uses this directory to store Thymeleaf templates by default. For example, create a file called it and add some HTML code and a Thymeleaf attribute to it.src/main/resources/templatesindex.html
4. Return the Thymeleaf template in the Spring Boot controller. Create a new controller class, or use an existing controller and define a method in it that maps to the template. For example:

javaCopy codeimport org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class HomeController {

    @GetMapping("/")
    public String index(Model model) {
        model.addAttribute("message", "Hello, Thymeleaf!");
        return "index";
    }

}

In this example, we would “Hello, Thymeleaf!” Add to the model, and back. Spring Boot will automatically parse it into a template.indexindex.html

5. Run the Spring Boot project. After launching the project, visit the appropriate URL (e.g. 🙂 and you should see the HTML page generated by the Thymeleaf template.http://localhost:8080/

With these steps, you have successfully integrated Thymeleaf into your Spring Boot project. You can now use Thymeleaf to build the view layer of your web application.

Please explain the Thymeleaf configuration items in detail

The previous model used in this conversation is unavailable. We’ve switched you to the latest default model

Thymeleaf has a number of configurable options that can be set in the app configuration. Here are some common Thymeleaf configuration items and their meanings:

1. spring.thymeleaf.cache: Whether to enable Thymeleaf caching, default is true. Enabling caching can improve performance, but you may need to disable caching during development to facilitate debugging.
2. spring.thymeleaf.check-template-location: Whether to check the Thymeleaf template location, the default is true. Enable this option to check if the template file exists to provide a more meaningful error message if the file does not exist.
3. spring.thymeleaf.check-template: Check whether to check the Thymeleaf template, the default is true. If set to false, Thymeleaf will ignore template files that do not exist and will not provide any error messages about the file at runtime.
4. spring.thymeleaf.content-type: Specifies the content type to use for the response. The default is text/html, but you can change to a different content type.
5. spring.thymeleaf.enabled: Whether to enable Thymeleaf, the default is true. If set to false, Spring Boot will disable Thymeleaf completely and use the default view resolver.
6. spring.thymeleaf.encoding: Specifies the character encoding used to read and write template files, which defaults to UTF-8.
7. spring.thymeleaf.excluded-view-names: Specifies which view names should not be resolved by Thymeleaf, defaulting to none. Multiple view names can be specified using a comma-separated list.
8. spring.thymeleaf.mode: Specifies the mode of Thymeleaf. The default is HTML5, but can be changed to XML, TEXT, or LEGACYHTML5.
9. spring.thymeleaf.prefix: Specifies the prefix of the Thymeleaf template file, which defaults to “classpath:/templates/”. You can change to a different directory or file system path.
10. spring.thymeleaf.suffix: Specifies the suffix of the Thymeleaf template file, which defaults to “.html”. You can change to a different file extension or the full file name.
11. spring.thymeleaf.template-resolver-order: Specifies the order of the Thymeleaf template parsers, which defaults to 0. If you want to use multiple template parsers, you can set this option to specify the priority of the parsers.
12. spring.thymeleaf.view-names: Specifies the name of the view to be resolved by Thymeleaf. The default is all view names, but specific view names can be specified using a comma-separated list.
13. spring.thymeleaf.servlet.content-type: Specifies the type of content to use for the response (only applicable when using servlets as web servers). The default is text/html, but you can change to a different content type.

These options can be set in the application configuration file, such as application.properties or application.yml. Note that these options are not required, and in most cases, you can use the default values. However, depending on the needs and performance requirements of the application

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Here are some other Thymeleaf configuration items:

14. spring.thymeleaf.servlet.cache: Whether to enable Thymeleaf caching in the servlet environment, default is true. Similar to, but only for servlet environments.spring.thymeleaf.cache
15. spring.thymeleaf.servlet.enabled: Whether to enable Thymeleaf in the servlet environment, the default is true. Similar to, but only for servlet environments.spring.thymeleaf.enabled
16. spring.thymeleaf.servlet.encoding: Specifies the character encoding used to read and write the template file (only applicable when using the servlet as a web server). The default is UTF-8.
17. spring.thymeleaf.servlet.view-names: Specifies the view name to be resolved by Thymeleaf (only applicable when using a servlet as a web server). The default is all view names, but specific view names can be specified using a comma-separated list.
18. spring.thymeleaf.static-variables: Specifies the static variable used in the template. For example, you can add constants to a template to reuse in multiple templates.
19. spring.thymeleaf.expression-prefix: Specifies the prefix used for the Thymeleaf expression. The default is, but can be changed to a different prefix.#{
20. spring.thymeleaf.expression-suffix: Specifies the suffix used for the Thymeleaf expression. The default is, but can be changed to a different suffix.}
21. spring.thymeleaf.message-resolver-order: Specifies the order of the Thymeleaf message parsers, which defaults to 0. If you want to use multiple message parsers, you can set this option to specify the priority of the parsers.
22. spring.thymeleaf.dialect.prefix: Specifies the prefix used to customize the Thymeleaf dialect, which defaults. You can change to a different prefix.th:
23. spring.thymeleaf.enable-spring-el-compiler: Whether to enable the Spring EL compiler, the default is false. Enabling the compiler can improve performance, but may increase memory usage.
24. spring.thymeleaf.enable-spring-data-notation: Whether to enable Spring Data support, the default is true. Enable support for special expressions that Spring Data provides in your templates.

In summary, these Thymeleaf configuration items provide some very useful features that can help you tune Thymeleaf’s behavior to the needs and performance requirements of your application. When configuring Thymeleaf, be sure to double-check the options and what they mean, and set them up according to your actual needs.

Please explain the Thymeleaf namespace in detail

The Thymeleaf namespace is a way to introduce and use custom attributes and tags in Thymeleaf templates. Namespaces can help templates be clearer, more concise, and easier to extensify. The Thymeleaf namespace starts with the following namespaces:th

1. th: Thymeleaf’s core namespace for using Thymeleaf’s built-in properties and tags. For example: , , etc.th:textth:each
2. thymeleaf: Thymeleaf’s native namespace to use Thymeleaf’s native properties and tags. For example: , , etc.thymeleaf:includethymeleaf:with
3. layout: The namespace used to define the layout of the template. For example: , , etc.layout:decoratelayout:fragment
4. sec: A namespace for Spring Security integration to handle security-related tags and attributes. For example: , , etc.sec:authorizesec:authentication
5. data: A namespace for Spring Data integration to handle data-related tags and attributes. For example: , , etc.data-th-objectdata-th-field

Using namespaces makes templates easier to read and maintain. For example, if you want to use Thymeleaf’s statement in your template, you can use the following code:each

htmlCopy code<ul>
    <li th:each="item : ${items}" th:text="${item}"></li>
</ul>

In this example, we use the namespace reference statement, which is the core tag of Thymeleaf, which iterates over the collection and generates duplicate HTML code.theach

Similarly, if you want to use a layout in a template, you can use the following code:

htmlCopy code<!DOCTYPE html>
<html xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">
<head>
    <title>My Page</title>
    <layout:include layout:fragment="head"/>
</head>
<body>
    <layout:decorate template="layout/page">
        <div layout:fragment="content">
            This is the main content of the page.
        </div>
    </layout:decorate>
</body>
</html>

In this example, we use namespaces to reference layout-related markup and properties, which is a custom namespace for defining and using layout templates.layout

In conclusion, the Thymeleaf namespace is a very useful technique to help you better organize and maintain templates, improve code reuse and readability. Namespaces also become more important when you need to extend Thymeleaf or use third-party libraries.

Please explain Thymeleaf attribute substitution in detail

Thymeleaf attribute substitution is a technique for dynamically replacing attribute values in Thymeleaf templates. It allows you to dynamically change the attributes of HTML elements based on different conditions or data, such as text content, link addresses, styles, class names, etc.

Attribute substitution can be used in standard HTML attributes as well as in Thymeleaf-specific attributes. Here are some examples:

1. Replace the text content:

htmlCopy code<p th:text="${message}">This text will be replaced.</p>

In this example, we replace the text content of the element with attributes. is a Thymeleaf expression that gets the value of a model property named . At run time, Thymeleaf inserts the value of this expression into the element.th:textp${message}messagep

2. Replace the link address:

htmlCopy code<a href="#" th:href="@{/user/{id}(id=${user.id})}">View User</a>

In this example, we replace the link address of the element with attributes. is a Thymeleaf URL expression used to construct URLs that contain values. At run time, Thymeleaf inserts the value of the URL expression into the element’s attributes.th:hrefa@{/user/{id}(id=${user.id})}user.idahref

3. Replacement style:

htmlCopy code<div th:style="'background-color:' + ${color}">
    This div will have a background color.
</div>

In this example, we replace the style of the element with attributes. is a Thymeleaf expression that gets the value of a model property named . We concatenate attribute values into strings to create styles dynamically. At run time, Thymeleaf inserts the style string into the element’s properties.th:stylediv${color}colorbackground-color:divstyle

4. Replace class names:

htmlCopy code<div th:class="${status} == 'error' ? 'error' : ''">
    This div will have a class based on the 'status' variable.
</div>

In this example, we use attributes to replace the class name of the element. is a Thymeleaf expression that gets the value of a model property named . We use the ternary operator to dynamically set the class name based on the value. If so, set the class name; Otherwise, the setting class name is an empty string. At run time, Thymeleaf inserts the class name string into the element’s attributes.th:classdiv${status}statusstatusstatuserrorerrordivclass

In conclusion, Thymeleaf attribute substitution is a very useful technique that can help you create dynamic HTML content based on dynamic data or conditions. It allows you to dynamically modify the attributes of HTML elements using Thymeleaf’s expressions and logical statements for a better user experience and higher maintainability.

Please explain the Thymeleaf variable expression in detail

A Thymeleaf variable expression is a syntax for referencing a variable or model property in a Thymeleaf template. It allows you to pass data from a controller to a template and insert it into HTML elements for the purpose of dynamically generating content.

Variable expressions use or wrap variable names or expressions. Used to get the value of a variable or property in the current context, and to get the value of a variable or property in an iterative or nested context.${}*{}${}*{}

Here are some examples:

1. To get the model properties:

htmlCopy code<p th:text="${message}">This text will be replaced.</p>

In this example, we use an expression to get the value of a model property named and insert it into an element.${message}messagep

2. Use built-in variables:

htmlCopy code<p>Current time: <span th:text="${#dates.format(now, 'yyyy-MM-dd HH:mm:ss')}"></span></p>

In this example, we use an expression to get the current time, format the time using a utility class, and then insert it into an element.${#dates.format(now, 'yyyy-MM-dd HH:mm:ss')}#datesspan

3. Iterate over a collection:

htmlCopy code<ul>
    <li th:each="item : ${items}" th:text="${item}"></li>
</ul>

In this example, we use the statement to iterate over the collection named and use an expression to get the value of each element in the collection and insert it into the element.th:eachitems${item}li

4. Get the properties in the nested context:

htmlCopy code<div th:object="${user}">
    <p>Name: <span th:text="*{name}"></span></p>
    <p>Age: <span th:text="*{age}"></span></p>
</div>

In this example, we use properties to set the object named as the current context and an expression to get the properties in the object. In this case, the expression gets the properties of the object and inserts them into the element.th:objectuser*{}*{name}namespan

In conclusion, Thymeleaf variable expressions are a very useful technique to help you pass data from controllers into templates and insert them into HTML elements for the purpose of dynamically generating content. It’s simple to use, intuitive, and can be used with Thymeleaf’s other features, such as attribute substitution, conditional statements, and more, for more complex dynamic content generation.

Please explain the Thymeleaf selection expression in detail

Thymeleaf selection expressions are a syntax for selecting HTML elements in Thymeleaf templates. It allows you to select different HTML elements according to different criteria and insert them into the template for the purpose of dynamically generating content.

Select expressions using attribute names and conditional expressions that wrap HTML elements. A conditional expression can be any Boolean expression that specifies the criteria for selecting an HTML element. If the condition is true, the element is selected and inserted into the template. If the condition is false, the element is not selected or inserted into the template.*{}

Here are some examples:

1. Select HTML elements based on criteria:

htmlCopy code<div th:if="${status} == 'error'">
    <p>Error: <span th:text="${errorMessage}"></span></p>
</div>

In this example, we use attributes to select elements based on conditions. If the value is equal to, select the element, insert the element into the element, and use the expression to get the error message. Otherwise, the element is not selected or inserted into the template.th:if${status} == 'error'divstatuserror<p>div${errorMessage}

2. Iterate over the collection and select the element:

htmlCopy code<ul>
    <li th:each="item : ${items}" th:class="${item.status} == 'complete' ? 'done' : ''">
        <span th:text="${item.description}"></span>
    </li>
</ul>

In this example, we use statements to iterate over a collection named and select elements using conditional expressions. If the value is equal, the element is selected and the class is added to the element. Otherwise, the element is not selected and an empty string is added to the element as the class name.th:eachitems${item.status} == 'complete' ? 'done' : ''liitem.statuscompletedonelili

3. Select attribute values based on criteria:

htmlCopy code<button th:attr="${isDisabled} ? disabled : ''">Submit</button>

In this example, we use attributes to select elements and conditional expressions to select the value of attributes. If the value is , select the property and set its value to. Otherwise, the property is not selected or inserted into the template.th:attrbutton${isDisabled} ? disabled : ''disabledisDisabledtruedisableddisabled

In conclusion, Thymeleaf selection expressions are a very useful technique that can help you select different HTML elements based on different criteria and insert them into the template. It is simple to use, intuitive, and can be used with Thymeleaf’s other features such as variable expressions, attribute substitution, etc. for more complex dynamic content generation.

Please explain the Thymeleaf collection selection in detail

Thymeleaf collection selection is a syntax for selecting and manipulating collection elements in Thymeleaf templates. It allows you to filter, sort, group, calculate collection elements based on different criteria, and insert them into templates for the purpose of dynamically generating content.

Collection selection uses the package collection name and conditional expression, and then operates on the collection using Thymeleaf’s built-in collection processing utility classes. Here are some examples:*{}

1. To filter collection elements:

htmlCopy code<ul>
    <li th:each="item : ${items.?[status == 'complete']}" th:text="${item.description}"></li>
</ul>

In this example, we use an expression to filter the elements in a collection named . Conditional expressions filter out elements with status based on the value of the attribute. Then, use statements to iterate over the filtered element and use expressions to get the element’s description and insert it into the element.${items.?[status == 'complete']}items?[status == 'complete']statuscompleteth:each${item.description}li

2. To sort collection elements:

htmlCopy code<ul>
    <li th:each="item : ${items.^[date]}">
        <span th:text="${item.description}"></span>
        <span th:text="${#dates.format(item.date, 'yyyy-MM-dd')}"></span>
    </li>
</ul>

In this example, we use expressions to sort the collection elements named by attributes. Use operators for ascending sorting, and operators for descending sorting. Then, use the statement to iterate over the sorted elements, use the expression to get the description of the element, the expression formats the dates, and inserts them into the element.${items.^[date]}itemsdate^vth:each${item.description}${#dates.format(item.date, 'yyyy-MM-dd')}li

3. To group collection elements:

htmlCopy code<ul>
    <li th:each="group : ${items.![status].distinct()}">
        <h2 th:text="${group}"></h2>
        <ul>
            <li th:each="item : ${items.?[status == group]}" th:text="${item.description}"></li>
        </ul>
    </li>
</ul>

In this example, we use expressions to group collection elements named by attributes. Use the operator to extract the values of all properties in the collection, using methods to deduplicate. Then, use the statement to iterate over the grouped element and use the expression to get the value of the current grouping and insert it into the element. Then, use an expression in the nested element to filter out the elements of the current grouping and use the statement stack${items.![status].distinct()}itemsstatus![status]statusdistinct()th:each${group}h2ul${items.?[status == group]}th:each

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and use an expression to get the description of the element and insert it into the element.${item.description}li

4. To calculate a collection element:

htmlCopy code<p>Total price: <span th:text="${#numbers.formatDecimal(items.![price].sum(), 2, 'COMMA', 'POINT')}"></span></p>

In this example, we use an expression to sum an attribute in a collection element named and format the result using a method. is a built-in math tool class in Thymeleaf, which can perform various mathematical calculations and formatting. In this case, we use the method to format the result as a string with 2 decimal places, thousands separator, decimal point and insert it into the element.${items.![price].sum()}itemsprice#numbers.formatDecimal#numbersformatDecimal(),.span

In conclusion, Thymeleaf collection selection is a very useful technique that can help you select and manipulate collection elements and insert them into templates. It is simple to use, intuitive, and can be used with Thymeleaf’s other features such as variable expressions, attribute substitution, etc. for more complex dynamic content generation.

Please explain in detail the Thymeleaf process control condition assessment (if, unless)

Thymeleaf process control condition evaluation is a syntax for selecting elements based on conditions in Thymeleaf templates. It allows you to select different HTML elements according to different criteria and insert them into the template for the purpose of dynamically generating content.

Conditional evaluation uses and attributes to evaluate conditional expressions. If the conditional expression is true, the element is selected and inserted into the template. If the conditional expression is false, the element is not selected or inserted into the template. The attribute indicates that the element is selected only if the condition is true, and the attribute indicates that the element is selected only if the condition is false.th:ifth:unlessth:ifth:unless

Here are some examples:

1. To select an element using attributes:th:if

htmlCopy code<div th:if="${status} == 'error'">
    <p>Error: <span th:text="${errorMessage}"></span></p>
</div>

In this example, we use attributes to select elements based on conditions. If the value is equal to, select the element, insert the element into the element, and use the expression to get the error message. Otherwise, the element is not selected or inserted into the template.th:if${status} == 'error'divstatuserror<p>div${errorMessage}

2. To select an element using attributes:th:unless

htmlCopy code<div th:unless="${isAuthenticated}">
    <a href="/login">Login</a>
</div>

In this example, we use attributes to select elements based on conditions. If the value is false, the element is selected and the element is inserted into the element. element contains a link to a page for login. Otherwise, the element is not selected or inserted into the template.th:unless${isAuthenticated}divisAuthenticated<a>div<a>/login

3. Use combination of conditions:

htmlCopy code<div th:if="${status} == 'success' and ${isAuthenticated}">
    <p>Welcome, <span th:text="${username}"></span>!</p>
</div>

In this example, we use operator combinations and conditional expressions. Only when both conditions are true, the element is selected, the element is inserted into the element, and the expression is used to get the user name. Otherwise, the element is not selected or inserted into the template.and${status} == 'success'${isAuthenticated}div<p>div${username}

In conclusion, Thymeleaf process control condition evaluation is a very useful technique to help you select different HTML elements based on different criteria and insert them into your template. It is simple to use, intuitive, and can be used with Thymeleaf’s other features such as variable expressions, attribute substitution, etc. for more complex purposes

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Dynamic content generation. In addition to the ampersand, Thymeleaf provides other process control properties, such as ampersands, which implement statement-like functionality, and attributes, which iterate over collection elements.th:ifth:unlessth:switchth:caseswitch-caseth:each

Overall, Thymeleaf’s process control condition evaluation provides a convenient and flexible way to control the display and hiding of HTML elements in templates, allowing you to dynamically generate content based on different criteria. Its syntax is simple and easy to understand, making it suitable for a wide range of complex dynamic content generation needs.

Please explain in detail the Thymeleaf process control loop traversal (th:each)

Thymeleaf process control loop traversal is a syntax for iterating over collection elements in a Thymeleaf template. It allows you to iterate through collection elements and insert them into templates for dynamic content generation.

Loop traversal uses attributes to specify the name of the collection to traverse, and maps collection elements to variables using similar syntax. You can then use variable expressions to access the properties of the collection elements and insert them into the template.th:eachitem : ${items}item${item}

Here are some examples:

1. Iterate over collection elements:

htmlCopy code<ul>
    <li th:each="item : ${items}" th:text="${item.description}"></li>
</ul>

In this example, we use properties to iterate over a collection element named and insert the element into the template. Use an expression in an attribute to get the description of the element and insert it into the element.th:eachitems<li>th:text${item.description}<li>

2. Iterate over the collection elements and calculate the ordinal:

htmlCopy code<ol>
    <li th:each="item, index : ${items}" th:text="${index + 1 + '. ' + item.description}"></li>
</ol>

In this example, we use properties to iterate over a collection element named and insert the element into the template. Use syntax to map collection elements to variables and sums. Use an expression in an attribute to evaluate ordinal numbers and insert them into elements.th:eachitems<li>item, indexitemindexth:text${index + 1 + '. ' + item.description}<li>

3. Iterate over nested collection elements:

htmlCopy code<table>
    <tr th:each="row : ${table}">
        <td th:each="cell : ${row}" th:text="${cell}"></td>
    </tr>
</table>

In this example, we use properties to iterate over a collection element named and insert the element into the template. Nest another property within an attribute to iterate over a cell in a row and insert an element into the element. Use an expression to get the value of a cell and insert it into an element.th:eachtable<tr>th:eachth:each<td><tr>${cell}<td>

4. To filter collection elements:

htmlCopy code<ul>
    <li th:each="item : ${items.?[status == 'complete']}" th:text="${item.description}"></li>
</ul>

In this example, we use an expression to filter the elements in a collection named . The conditional expression filters out the status of ‘complete’ based on the value of the attribute${items.?[status == 'complete']}items?[status == 'complete']status

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的元素，并将其映射到变量item<li>${item.description}<li>`元素中。中。然后，我们将元素插入到模板中，并使用表达式获取元素的描述，并将其插入到

Overall, Thymeleaf process control loop traversal provides a convenient, flexible way to iterate over collection elements and insert them into templates. Its syntax is simple and easy to understand, making it suitable for a wide range of complex dynamic content generation needs. In addition to attributes, Thymeleaf provides other flow control properties, such as and attributes, which implement statement-like functionality, and attributes, which are used to select elements based on conditions.th:eachth:switchth:caseswitch-caseth:ifth:unless

Please explain in detail the Thymeleaf process control collection operation

Thymeleaf process control collection operations are a syntax for manipulating collections in Thymeleaf templates. It allows you to perform various operations on collections, such as adding, removing, sorting, etc., and insert them into templates for the purpose of dynamically generating content.

Collection operations are implemented using Thymeleaf’s built-in utility classes. The tool class provides various methods for manipulating collections, such as adding elements, removing elements, sorting, filtering, and so on.#lists

Here are some examples:

1. To add an element to the collection:

htmlCopy code<ul>
    <li th:each="item : ${items}">
        <span th:text="${item.description}"></span>
    </li>
    <li>
        <input type="text" th:field="*{newItem}" />
        <button type="button" th:onclick="'javascript: addItem(\'' + ${#ids.seq('item')} + '\')'">Add Item</button>
    </li>
</ul>

<script th:inline="javascript">
    function addItem(id) {
        var newItem = document.getElementById(id).value;
        [[# th:if="${not #lists.contains(items, newItem)}"]]
            [[# th:removeVariable="items" /]]
            [[# th:append="items" value="${newItem}" /]]
        [[/ th:if]]
        document.getElementById(id).value = '';
    }
</script>

In this example, we use properties to iterate over a collection element named and insert the element into the template. In the element, we use the expression to get the description of the element and insert it into the element. Then, we added a text box and an “Add Item” button to add a new element to the collection. In the properties of the button, we call the function using JavaScript and pass the ID of the new element as a parameter to it.th:eachitems<li><li>${item.description}<span>th:onclickaddItem()

In the function, we first use JavaScript to get the value of the new element and check if it already exists in the collection. If the new element does not exist in the collection, we use methods to check if the collection contains that element. If the element is not included in the collection, the new element is added to the collection using the Thymeleaf built-in and method.addItem()#lists.contains#lists.removeVariable#lists.append

2. To remove an element from a collection:

htmlCopy code<ul>
    <li th:each="item : ${items}">
        <span th:text="${item.description}"></span>
        <button type="button" th:onclick="'javascript: removeItem(\'' + ${item.id} + '\')'">Remove</button>
    </li>
</ul>

<script th:inline="javascript">
    function removeItem(id) {
        [[# th:removeVariable="items" /]]
        [[# th:each="item : ${itemsCopy}"]]
            [[# th:if="${item.id != id}"]]
                [[# th:append="items" value="${item}" /]]
            [[/ th:if]]
        [[/ th:each]]
    }
</script>

In this example, we use attributesth:each

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Iterates over the collection element named and inserts the element into the template. In the element, we use the expression to get the description of the element and insert it into the element. We then added a “Remove” button to remove the element from the collection. In the properties of the button, we call the function using JavaScript and pass the ID of the element as a parameter to it.items<li><li>${item.description}<span>th:onclickremoveItem()

In the function, we first use the method to remove all elements in the collection. We then use methods to iterate over a copy of the collection and use methods to add elements that are not to be removed to the collection.removeItem()#lists.removeVariable#lists.each#lists.append

Overall, Thymeleaf Process Control Collection Operations provides a convenient and flexible way to manipulate collections and insert them into templates. Its syntax is simple and easy to understand, making it suitable for a wide range of complex dynamic content generation needs. In addition to utility classes, Thymeleaf provides other process control properties and utility classes, such as and utility classes for manipulating collections and maps, and and attributes for implementing statement-like functionality.#lists#sets#mapsth:switchth:caseswitch-case

Please explain the Thymeleaf layout template in detail

Thymeleaf layout templates are a technique for implementing template inheritance and template composition in Thymeleaf applications. It allows you to define one or more master templates and then create additional templates based on them, achieving the purpose of code reuse and template composition.

Layout templates are implemented using Thymeleaf’s built-in namespaces and properties. The namespace contains a set of properties and labels for layout templates, such as , and so on.layoutlayout:decoratorlayout:decoratorlayout:fragmentlayout:include

Here’s an example:

1. Define the main template:

htmlCopy code<!DOCTYPE html>
<html xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">
<head>
    <title layout:title-pattern="$LAYOUT_TITLE - $CONTENT_TITLE">My Site</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="/css/style.css" rel="stylesheet" type="text/css" />
    <script src="/js/scripts.js"></script>
</head>
<body>
    <header layout:fragment="header">
        <h1>My Site</h1>
    </header>
    <div layout:fragment="content">
        <p>Welcome to my site!</p>
    </div>
    <footer layout:fragment="footer">
        <p>&copy; My Site 2023</p>
    </footer>
</body>
</html>

In this example, we define a main template called . The template contains a header, a content, and a footer, each defined with attributes. element, we define a dynamic page title using attributes, where the title of the main template is denoted and the title of the current page is debited.default.htmllayout:fragment<head>layout:title-pattern$LAYOUT_TITLE$CONTENT_TITLE

2. Define the subtemplate:

htmlCopy code<!DOCTYPE html>
<html xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
      layout:decorator="default.html">
<head>
    <title>My Page</title>
</head>
<body>
    <div layout:fragment="content">
        <p>This is my page.</p>
    </div>
</body>
</html>

In this example, we define a subtemplate named . The template uses properties to specify the main template from which it inherits. element, we define a static page title. In elements, we overwrite fragments of the main template with attributes to achieve customized content.mypage.htmllayout:decorator<head><body>layout:fragmentcontent

3. To render a page:

htmlCopy code<!DOCTYPE html>
<html xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
      layout:decorator="default.html">
<head>
    <title>My Page</title>
</head>
<body>
    <div layout:fragment="content">
        <p>This is my page.</p>
    </div>
</body>
</html>

In this example, we use template shadingmypage.html

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Dye the page. The page inherits the main template and overrides the fragment with properties to insert customized content.default.htmllayout:fragmentcontent

Overall, Thymeleaf layout templates provide a convenient and flexible way to implement template inheritance and template composition for the purpose of code reuse and template combination. Its syntax is simple and easy to understand, making it suitable for a wide range of complex dynamic content generation needs. In addition to namespaces and attributes, Thymeleaf provides other layout template properties and tags, such as and attributes for defining and including template fragments, and and attributes for replacing and inserting template content.layoutlayout:decoratorlayout:fragmentlayout:includelayout:replacelayout:insert

Please explain Thymeleaf fragment management in detail

Thymeleaf fragment management is a technique for managing and organizing template fragments in the Thymeleaf application. It allows you to define and combine a variety of different fragments and insert them into templates for the purpose of code reuse and template composition.

Fragment management is implemented using Thymeleaf’s built-in namespaces and attributes. The namespace contains a set of properties and labels for fragment management, such as , and so on.fragmentth:fragmentth:fragmentth:replaceth:insert

Here’s an example:

1. Define a fragment:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Site</title>
</head>
<body>
    <header th:fragment="header">
        <h1>My Site</h1>
    </header>
    <div th:fragment="content">
        <p>Welcome to my site!</p>
    </div>
    <footer th:fragment="footer">
        <p>&copy; My Site 2023</p>
    </footer>
</body>
</html>

In this example, we define a template named and define three fragments in it: , , and . Each fragment is defined using properties and contains some static content.fragments.htmlheadercontentfooterth:fragment

2. Quote snippet:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Page</title>
</head>
<body>
    <div th:replace="fragments :: header"></div>
    <div th:replace="fragments :: content"></div>
    <div th:replace="fragments :: footer"></div>
</body>
</html>

In this example, we use attributes to reference the three fragments defined in the template: , , and . Each fragment is referenced using an operator and preceded by the name of the template. This will tell Thymeleaf to find the template and look for the corresponding fragment in it.th:replacefragments.htmlheadercontentfooter::fragments.html

3. To render a page:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Page</title>
</head>
<body>
    <div>
        <h1>My Site</h1>
    </div>
    <div>
        <p>Welcome to my site!</p>
    </div>
    <div>
        <p>&copy; My Site 2023</p>
    </div>
</body>
</html>

In this example, we render the page using a template. The page references the three fragments in the template and inserts them into the template. The rendered page will contain the contents of three fragments, , , and .myPage.htmlfragments.htmlheadercontentfooter

Overall, Thymeleaf snippet management provides a convenient and flexible one

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Methods to manage and organize template fragments and insert them into templates for the purpose of code reuse and template composition. Its syntax is simple and easy to understand, making it suitable for a wide range of complex dynamic content generation needs. In addition to namespaces and attributes, Thymeleaf provides other fragment management properties and labels, such as and attributes for replacing and inserting fragment content, and attributes for including and inserting external fragments.fragmentth:fragmentth:replaceth:insertth:includeth:insert

Please explain fragment parameter passing in detail

Thymeleaf fragment parameter passing is a technique for passing parameters to fragments in a Thymeleaf application. It allows you to define placeholders in a fragment and then populate those placeholders by passing parameters where the fragment is used.

Fragment parameter passing is implemented using Thymeleaf’s built-in properties and attributes. This property contains a set of labels and properties for passing fragment parameters, such as , and so on.th:fragmentth:withth:fragmentth:withth:text

Here’s an example:

1. Define a fragment with parameters:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Site</title>
</head>
<body>
    <div th:fragment="greeting(name)">
        <p>Hello, <span th:text="${name}"></span>!</p>
    </div>
</body>
</html>

In this example, we define a template named and define a fragment with parameters in it: . The fragment contains a placeholder and contains some static text and an expression. This tells Thymeleaf to replace the parameters with the result of that expression when rendering.fragments.htmlgreetingname${name}name

2. To quote a fragment with parameters:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Page</title>
</head>
<body>
    <div th:replace="fragments :: greeting('John')"></div>
    <div th:replace="fragments :: greeting('Jane')"></div>
</body>
</html>

In this example, we reference the fragment with parameters defined in the template using the property:. When referencing, we pass two different parameter values and sums to the fragment by adding parentheses and parameter values after the fragment name.th:replacefragments.htmlgreeting'John''Jane'

3. To render a page:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Page</title>
</head>
<body>
    <div>
        <p>Hello, John!</p>
    </div>
    <div>
        <p>Hello, Jane!</p>
    </div>
</body>
</html>

In this example, we render the page using a template. The page references the fragments with parameters in the template and inserts them into the template. The rendered page will contain the contents of two fragments, the sum, which is passed into the fragment via parameters.myPage.htmlfragments.htmlHello, John!Hello, Jane!'John''Jane'

Overall, Thymeleaf fragment parameter passing provides a convenient and flexible way to pass to fragments

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Takes parameters and dynamically generates content at render time. Its syntax is simple, easy to understand, and suitable for a wide range of dynamic content generation needs. In addition to the and attributes, Thymeleaf provides other fragment parameters to pass properties and labels, such as and attributes for looping and conditionally rendering fragment content, and and attributes for containing and inserting external fragments and passing parameters to them.th:fragmentth:withth:eachth:ifth:includeth:insert

Please explain in detail that form elements are bound to Thymeleaf objects

In web development, form elements are one of the most important elements. The Thymeleaf framework provides a convenient way to bind form elements to backend Java objects, making it easy to get form data after submitting it for processing.

In Thymeleaf, binding is done through the properties of form elements and the properties of back-end Java objects. Specifically, you can use the dot syntax in the properties of a form element to specify the hierarchy of object properties. For example, if we have a Java object named with a property named it, we can bind it to a text input box as follows:namenameusername

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Form</title>
</head>
<body>
    <form action="/save" method="post">
        <label for="name">Name:</label>
        <input type="text" id="name" name="user.name" th:value="${user.name}" />
        <button type="submit">Save</button>
    </form>
</body>
</html>

In this example, we created a form that contains a text input box and a submit button. The properties of the input box are set to bind the input box to the properties in the object using the dot syntax. The properties of the input box are also specified so that when the form is rendered, the default value in the input box is taken from the property.nameuser.nameusernameth:value${user.name}user.name

After submitting the form, we can get the form data by declaring an object in the back-end Java code and binding the object to the form data. Specifically, we can use annotations to bind form data to objects, as follows:user@ModelAttributeuser

javaCopy code@PostMapping("/save")
public String saveUser(@ModelAttribute("user") User user) {
    // 处理表单数据
    return "redirect:/success";
}

In this example, we use annotations to bind form data to an object named . In the method, we can use this object to get the form data and process it.@ModelAttributeuserUser

Overall, Thymeleaf object binding provides a convenient way to bind form elements to back-end Java objects for form data acquisition and processing. Its syntax is simple, easy to understand, and suitable for a variety of form processing needs.

Please explain Thymeleaf form validation in detail

Thymeleaf form validation is a technique for validating form data in a Thymeleaf application. It allows you to validate form data before submitting it, and return error messages to the front-end page if validation fails, to improve user experience and data integrity.

Thymeleaf form validation is achieved by using the validation annotations provided by the back-end Java framework and Thymeleaf’s built-in amp properties. Specifically, we can add a validation annotation to the property of the back-end Java object, such as , , , etc., to specify that the property needs to be validated. Then, in the front-end page, we can use properties to check whether the form data passed the check, and properties to display error messages, as follows:th:ifth:text@NotBlank@NotNull@Sizeth:ifth:text

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Form</title>
</head>
<body>
    <form action="/save" method="post">
        <label for="name">Name:</label>
        <input type="text" id="name" name="name" th:value="${user.name}" />
        <span th:if="${#fields.hasErrors('name')}" th:text="${#fields.errors('name')}"></span>
        <button type="submit">Save</button>
    </form>
</body>
</html>

In this example, we created a form that contains a text input box and a submit button. The properties of the input box are set to correspond to the properties in the backend Java object. Behind the input box, we use properties to check whether the form data passed the check, and use properties to display error information. Check whether there are errors in the property and return the error information of the property.namenamenameth:ifth:text#fields.hasErrors('name')name#fields.errors('name')name

In the back-end Java code, we can bind the form data and validation results to the back-end Java objects and objects using and annotations, as follows:@ValidBindingResultBindingResult

javaCopy code@PostMapping("/save")
public String saveUser(@Valid User user, BindingResult result) {
    if (result.hasErrors()) {
        return "form";
    }
    // 处理表单数据
    return "redirect:/success";
}

In this example, we use annotations to bind form data to an object and use the object to get the validation result. In the method, we can use the method to check the validation result for errors and return an error page when it is wrong.@ValidUserBindingResultresult.hasErrors()

Overall, Thymeleaf form validation provides a convenient and flexible way to validate form data and return error messages if validation fails. Its syntax is simple, easy to understand, and suitable for various form verification needs. In addition to the and attributes, Thymeleaf provides other form validation attributes and tags, such as ‘th:classth:ifth:text

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和th:attr’ attribute, which sets the class and attributes of an element for more sophisticated form validation and style control.

Please explain in detail the Thymeleaf form submission process

Thymeleaf form submission processing is a technique for handling form submissions in Thymeleaf applications. It allows you to get the form data from the back-end Java code after submitting it, and process and store it.

Thymeleaf form submission processing is usually implemented using annotations and annotations. Specifically, in the back-end Java code, we can declare a method that handles form submissions and add annotations on that method to specify that method handles POST requests. We can then use annotations to bind the form data into the backend Java object as follows:@PostMapping@ModelAttribute@PostMapping@ModelAttribute

javaCopy code@PostMapping("/save")
public String saveUser(@ModelAttribute("user") User user) {
    // 处理表单数据
    return "redirect:/success";
}

In this example, we create a method named and add annotations on the method to specify that method handles POST requests. We then use annotations to bind form data into objects and process them in methods. Finally, we return a string that redirects to the successful page to complete the form submission processing.saveUser@PostMapping@ModelAttributeUser

In the front-end page, we can create the form using labels and labels, and set the properties and properties of the form as follows:forminputactionmethod

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Form</title>
</head>
<body>
    <form action="/save" method="post">
        <label for="name">Name:</label>
        <input type="text" id="name" name="name" th:value="${user.name}" />
        <button type="submit">Save</button>
    </form>
</body>
</html>

In this example, we create a form named and set its property to , property . In the form, we create a text input box and bind it to a property in the object. Finally, we create a submit button and submit the form data to the backend Java code for processing after clicking the submit button.saveaction/savemethodpostUsername

Overall, Thymeleaf form submission processing provides a convenient and flexible way to process form data and process and store it in back-end Java code. Its syntax is simple, easy to understand, and suitable for a variety of form processing needs. In addition to annotations, Thymeleaf provides other form submission handling annotations and tags, such as annotations and attributes, for handling request parameters in forms and setting dynamic properties of forms.@PostMapping@ModelAttribute@RequestParamth:actionaction

Please explain in detail the Thymeleaf autoconfiguration in Spring Boot

Thymeleaf autoconfiguration in Spring Boot makes it very simple to use Thymeleaf in Spring Boot applications. It allows us to quickly integrate and use the Thymeleaf template engine without much configuration.

Thymeleaf autoconfiguration includes the following aspects:

1. Add dependencies: Add Thymeleaf’s dependencies to the pom .xml file, for example:

xmlCopy code<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2. Configure Thymeleaf: Spring Boot automatically configures Thymeleaf, so we don’t need to configure it manually. By default, Thymeleaf looks for template files in the directory./templates/
3. Configure template caching: During development, we want templates to reflect changes in code in real time. Therefore, in a development environment, Spring Boot automatically disables template caching. In a production environment, Spring Boot automatically enables template caching to improve the performance of your application.
4. Configure the template parser: Spring Boot automatically configures Thymeleaf’s template parser, allowing us to use Thymeleaf’s standard syntax and attributes, as well as Thymeleaf’s extended syntax and attributes.

When using Thymeleaf autoconfiguration, we only need to write the template file according to Thymeleaf’s standard syntax and attributes. For example, use syntax and properties in a template file to access and manipulate template variables and template tags.${}th:

Overall, Thymeleaf autoconfiguration in Spring Boot makes using Thymeleaf very simple and convenient. It allows us to quickly integrate and use the Thymeleaf template engine, as well as automatically configure template caches and template resolvers in development and production environments.

Please explain in detail the parsing of views using Thymeleaf in Spring Boot

View parsing using Thymeleaf in Spring Boot is a technology that integrates the Thymeleaf template engine with the Spring MVC framework. It allows us to use the Thymeleaf templating engine to generate dynamic HTML views and render them into client browsers.

View resolution with Thymeleaf in Spring Boot typically requires the following steps:

1. Add dependencies: Add dependencies for Thymeleaf and Spring MVC to the pom .xml file, for example:

xmlCopy code<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

2. Configure Thymeleaf: Add the following configuration to the application.properties or application.yml file to enable the Thymeleaf view parser:

propertiesCopy codespring.thymeleaf.enabled=true
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html

The configuration here specifies the prefix, suffix, and path to the Thymeleaf view parser. By default, Thymeleaf template files should be stored in a directory./templates/

3. Create Controller: Create a Spring MVC controller and add a request handling method to it, for example:

javaCopy code@Controller
public class MyController {

    @GetMapping("/hello")
    public String hello(Model model) {
        model.addAttribute("message", "Hello, Thymeleaf!");
        return "hello";
    }

}

This controller contains a request processing method called that adds a property named to the model and sets its value to . Finally, it returns a view name named .hellomessage"Hello, Thymeleaf!"hello

4. Create a template file: Create a template file named in the directory, for example:/templates/hello.html

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>My Page</title>
</head>
<body>
    <h1 th:text="${message}">Message</h1>
</body>
</html>

This template file contains a tag that uses Thymeleaf’s syntax and attributes to display the value of the attribute.h1${}th:textmessage

5. Start Application: Starts the application and accesses the path to trigger the request handling method in the controller./hello
6. Render view: The request handling method in the controller returned a view name named . Spring Boot automatically uses the Thymeleaf view parser to find the file and passes the properties in the model to that template file for rendering. Finally, the Thymeleaf view parser sends the resulting HTML view to the client browser for display.hello/templates/hello.html

Overall, Spring Boot

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View parsing using Thymeleaf is a very convenient and flexible technique that helps us quickly generate dynamic HTML views and render them into client browsers. When using Thymeleaf’s view parsing, we need to pay attention to the following aspects:

1. Configure the prefix, suffix, and path of the Thymeleaf view parser. By default, Thymeleaf template files should be stored in a directory./templates/
2. Use or object in the controller to pass model data to the template file. The Thymeleaf view parser automatically passes the properties in the model to the template file for rendering.ModelModelAndView
3. Use Thymeleaf’s syntax and properties, such as syntax and properties, in template files to access and manipulate properties in the model.${}th:
4. Thymeleaf’s syntax and properties, such as properties and attributes, can be used in template files for loop traversal and conditional judgment for more complex view logic.th:eachth:if

Overall, view parsing using Thymeleaf in Spring Boot is a very convenient and flexible technique that helps us quickly generate dynamic HTML views and render them into client browsers. At the same time, Thymeleaf’s syntax is simple and easy to understand, which can greatly improve our development efficiency.

Please explain in detail how to use Thymeleaf to handle exceptions

In the Spring Boot application, we can use Thymeleaf to handle exceptions and show friendly error pages. Thymeleaf provides a property called Thymeleaf that allows us to iterate through exception information in the template file.th:each

Here are the steps to handle exceptions using Thymeleaf:

1. Create a template file named to display the exception information. In the template file, use properties to iteratively process exception information. For example:error.htmlth:each

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Error</title>
</head>
<body>
    <h1>Error</h1>
    <div th:each="error : ${#fields.errors()}">
        <div th:text="${error}"></div>
    </div>
</body>
</html>

In this template file, we used Thymeleaf’s syntax and attributes to display exception information. At the same time, expressions are used to get all exception information in the form fields and iteratively process this exception information using properties.${}th:text${#fields.errors()}th:each

2. Create a class that handles exceptions. In this class, we can use annotations to handle exceptions of the specified type and return a template file. For example:ControllerAdvice@ExceptionHandlererror.html

javaCopy code@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public String handleException(Exception e, Model model) {
        model.addAttribute("error", e.getMessage());
        return "error";
    }

}

In this class, we used annotations to handle exceptions of types. In the exception handling method, we add a property named to the model and set its value to Exception Message. Finally, we returned the name of the template file.@ExceptionHandlerExceptionerrorerror.html

3. Use Thymeleaf’s syntax and attributes in the template file to display exception information. For example, add a property named in the template file to display exception information. For example:form.htmlerror

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Form</title>
</head>
<body>
    <h1>Form</h1>
    <form action="/submit" method="post">
        <input type="text" name="name" placeholder="Name" required>
        <input type="email" name="email" placeholder="Email" required>
        <button type="submit">Submit</button>
    </form>
    <div th:text="${error}"></div>
</body>
</html>

In this template file, we used Thymeleaf’s syntax and attributes to display exception information. If there is exception information, the property displays an exception message, otherwise nothing is displayed.${}th:text

4. Launch the application and enter illegal data in the form to trigger the exception. The exception-handling method is called and returns the template file. Thymeleaf iteratively processes exception information based on properties in the template file and displays it in the page.error.htmlth:each

Overall, handling exceptions with Thymeleaf is a very convenient and flexible technique

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Technique. Thymeleaf provides rich syntax and properties that allow us to easily handle exception information and display friendly error messages in the page. At the same time, using Thymeleaf to handle exceptions can also improve the reliability and maintainability of our applications.

Please explain in detail how to customize the Thymeleaf property

Thymeleaf is a highly customizable templating engine that enables more functionality with custom properties. In Thymeleaf, we can customize properties in two ways:

1. Custom namespaces

Namespaces in Thymeleaf are defined by attributes. where is the prefix of the namespace and is the URI of the namespace. Using a custom namespace, we can extend the functionality of Thymeleaf by adding our own attributes and tags.xmlns:prefix="uri"prefixuri

For example, we can define a namespace named and point it to a URI. We can then use the prefix in the template file to access custom properties and labels.mymy:

htmlCopy code<!DOCTYPE html>
<html xmlns:my="http://www.example.com/thymeleaf">
<head>
    <title>My Page</title>
</head>
<body>
    <h1 my:text="Hello, Thymeleaf!">Message</h1>
</body>
</html>

In this example, we used a prefix to access the custom property and set it to .my:my:text"Hello, Thymeleaf!"

2. Custom dialects

Dialects in Thymeleaf are defined by implementing interfaces. Dialects can extend Thymeleaf’s functionality by adding custom labels, attributes, expressions, and more. When customizing the dialect, we need to implement all the methods of the interface and register them in the Thymeleaf engine.org.thymeleaf.dialect.IDialectIDialect

For example, we can define a dialect called and register it with the Thymeleaf engine. We can then use the prefix in the template file to access custom properties and labels.mymy:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:my="http://www.example.com/thymeleaf">
<head>
    <title>My Page</title>
</head>
<body>
    <h1 my:text="Hello, Thymeleaf!">Message</h1>
</body>
</html>

In this example, we used a prefix to access the custom property and set it to . We also use the Thymeleaf prefix to access standard properties.my:my:text"Hello, Thymeleaf!"th:th:text

In general, customizing Thymeleaf properties is a very convenient and flexible technique that helps us extend the functionality of Thymeleaf and implement richer template logic. At the same time, Thymeleaf provides a variety of ways to customize properties, and can choose the appropriate way to implement custom functions according to your needs.

Please explain JavaScript inlining in Thymeleaf in detail

In web development, JavaScript is a very important language that can be used to implement various dynamic effects and interactive functions. In Thymeleaf, we can use JavaScript inlining to write JavaScript code directly in the template file, resulting in more flexible and granular page effects.

Using Thymeleaf’s JavaScript inlining, we can use attributes in the template file to specify the type of JavaScript code, and then use attributes to output JavaScript code.th:inlineth:utext

Here are the steps to use Thymeleaf’s JavaScript inline:

1. In the template file, use properties to specify the type of JavaScript code. For example:th:inline

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>JavaScript Inline</title>
    <script type="text/javascript" th:inline="javascript">
        // JavaScript code here
    </script>
</head>
<body>
    <!-- HTML code here -->
</body>
</html>

In this example, we used attributes to specify the type of JavaScript code. At the same time, we wrote JavaScript code in tags.th:inlinejavascript<script>

2. In JavaScript code, syntax and Thymeleaf’s expression language can be used to access and manipulate properties in the model. For example:${}

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>JavaScript Inline</title>
    <script type="text/javascript" th:inline="javascript">
        // JavaScript code here
        var name = /*[[${name}]]*/ '';
        alert("Hello, " + name + "!");
    </script>
</head>
<body>
    <!-- HTML code here -->
</body>
</html>

In this example, we used syntax and Thymeleaf’s expression language in our JavaScript code to access properties in the model. Then, use the function to display a pop-up box that displays a welcome message.${}namealert()

3. In the template file, you can use attributes to output JavaScript code. For example:th:utext

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>JavaScript Inline</title>
    <script type="text/javascript" th:inline="javascript">
        // JavaScript code here
        var name = /*[[${name}]]*/ '';
        th:utext("'Hello, ' + name + '!'");
    </script>
</head>
<body>
    <!-- HTML code here -->
</body>
</html>

In this example, we used properties to output JavaScript code. In this property, we use a JavaScript string literal to output a welcome message. Note that we used single and double quotes to refer to string literals to avoid conflicts with Thymeleaf’s attribute quotes.th:utext

Overall, Thymeleaf’s JavaScript inlining is a very convenient and flexible technology that helps us write JavaScript code directly in template files to achieve more flexible and granular page effects. Meanwhile, Thymeleaf too

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A rich expression language and properties are provided that allow us to easily access and manipulate properties in the model to achieve more complex and flexible page effects. Using Thymeleaf’s JavaScript inlining, we can take advantage of these features for more efficient and maintainable page development.

It is important to note that while Thymeleaf’s JavaScript inline provides a convenient programming experience, too much JavaScript code can affect the performance and maintainability of the page. Therefore, we should use JavaScript inlining wisely to avoid overuse and abuse. Also, to better organize and manage JavaScript code, we can encapsulate JavaScript code as a separate file and reference it using attributes in the template file. This avoids code duplication and confusion, and improves code maintainability and readability.th:src

Please explain the cache control in Thymeleaf in detail

In web development, caching is a very important optimization technique that can improve page loading speed and reduce server load. In Thymeleaf, we can use cache control to control the caching behavior of templates and pages, enabling more efficient and flexible page development.

Cache control in Thymeleaf mainly includes two aspects: template caching and page caching.

1. Template caching

Template caching refers to the Thymeleaf engine caching template files that have been parsed. When using Thymeleaf, template caching is enabled by default to improve the loading speed of pages and reduce the burden on the server.

If you need to turn off template caching, you can set the property to in the application’s configuration file. For example:spring.thymeleaf.cachefalse

arduinoCopy codespring.thymeleaf.cache=false

In this way, the template file is reparsed each time the page is visited, ensuring that the latest code and data are loaded.

2. Page caching

Page caching refers to the browser caching pages and resources that have already been visited. In Thymeleaf, we can use properties to control page caching behavior. This attribute can be used in the ampersand tag to indicate whether the current page can be cached.th:cacheable<html><body>

When using the property, we need to provide a cache name so that the page cache is identified on subsequent visits. For example:th:cacheable

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      th:cacheable="true"
      th:fragment="content">
<head>
    <title>Page Title</title>
</head>
<body>
    <!-- Page content here -->
</body>
</html>

In this example, we used the attribute to mark that the current page can be cached. We also define a fragment to reference the page in other templates.th:cacheableth:fragment

In addition to using properties, we can also use properties to remove pages that are already cached. For example:th:cacheableth:remove

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      th:remove="all">
<head>
    <title>Page Title</title>
</head>
<body>
    <!-- Page content here -->
</body>
</html>

In this example, we used attributes to remove all pages that have been cached. This way, on the next visit, the browser reloads the page and resources to get the latest code and data.th:remove

Overall, cache control in Thymeleaf is a very important technique that helps us improve the loading speed of our pages and reduce the load on our servers. In actual development, we should combine according to the needs and actual situation

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Cache control technology is used for more efficient and reliable page development.

It is important to note that while cache control can improve the performance and efficiency of a page, it can also introduce some problems and risks. For example, if a page is cached for too long, it can cause the browser to not get the latest code and data, resulting in errors or inconsistencies. In addition, if cache control is not applied correctly, it can lead to improper page loading or security issues. Therefore, when using cache control technology, we should carefully analyze and evaluate the risks and benefits, and take appropriate measures and strategies to ensure the normal operation and security of the page.

Please explain in detail how to perform Thymeleaf performance optimization

In web development, performance optimization is a very important job that can help us improve the loading speed and user experience of our pages. In Thymeleaf, we can adopt some optimization techniques and strategies to improve the efficiency and effect of template parsing and rendering, so as to achieve more efficient page development.

Here are some techniques and strategies for Thymeleaf performance optimization:

1. Reduce the template size

Template size has a significant impact on the efficiency of parsing and rendering. Therefore, we should minimize the size of the template to improve performance and efficiency. You can use the following methods to reduce the template size:

• Use template inheritance and fragment references wisely to avoid code duplication and redundancy.
• Avoid using too many HTML tags and attributes, and try to simplify the template structure and syntax.
• Keep static resources in templates, such as pictures, style sheets, scripts, and so on, separate for caching and reuse.

2. Make fair use of Thymeleaf’s attributes and expressions

Thymeleaf provides a wealth of properties and expressions that help us manipulate and display data more flexibly. However, if used incorrectly, it can also have an impact on performance. The following methods can be used to make reasonable use of Thymeleaf’s attributes and expressions:

• Avoid using Thymeleaf’s attributes and expressions too much, and try to simplify the template code and structure.
• Use appropriate expressions and avoid complex or redundant expressions.
• Use appropriate flow control statements and avoid excessive loops and conditional statements.

3. Fair use of caching

Caching is a very important optimization technique that can improve the loading speed of pages and reduce the burden on the server. In Thymeleaf, we can use cache control to control the caching behavior of templates and pages, enabling more efficient and flexible page development. You can use the following methods to make reasonable use of caching:

• Enable template caching to avoid duplicate parsing of template files.
• Use page caching wisely to avoid duplicate page loading and rendering.
• Avoid caching for too long, and try to ensure that the latest code and data are loaded and displayed.

4. Configure Thymeleaf’s options and attributes appropriately

Thymeleaf provides a number of options and properties that help us control the behavior of template parsing and rendering. The following methods can be used to properly configure Thymeleaf’s options and attributes:

• Configure the appropriate template patterns to avoid unnecessary template patterns.
• Configure the appropriate caching options

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to avoid problems caused by improper caching behavior.

• Configure appropriate template parsers and renderers to avoid inefficient parsing and rendering.

5. Reasonable use of Thymeleaf’s fragments and layouts

Thymeleaf’s snippet and layout features help us organize and manage our page code more flexibly, improving code maintainability and readability. Thymeleaf’s fragments and layouts can be used appropriately using the following methods:

• Use layout and fragment references wisely to avoid code duplication and redundancy.
• Avoid overusing nested fragments and try to simplify page structure and syntax.
• Avoid overusing fragment parameters and minimize the number and complexity of parameters.

6. Use CDN and static resource optimization

Using CDN and static resource optimization is a very important optimization technique to improve the loading speed and user experience of the page. You can use the following methods for CDN and static resource optimization:

• Store static resources such as images, stylesheets, scripts, etc. on a CDN for faster loading and display.
• Consolidate, compress, and cache static resources to reduce network requests and improve load speed.
• Use new image formats like WebP to reduce image size and improve loading speed.

Overall, Thymeleaf performance optimization is a very important job that helps us improve the loading speed and user experience of our pages. In actual development, we should reasonably adopt different optimization techniques and strategies according to the needs and actual situation to improve performance and efficiency.

Please do a brief introduction and needs analysis of Thymeleaf practical cases

Okay, here’s a brief introduction and needs analysis of a simple Thymeleaf in action.

Brief introduction

This is an online movie booking system where users can select movies, screenings and seats and book tickets online. The system uses Thymeleaf as the template engine, Spring Boot as the development framework, and MySQL as the database. Users can book tickets through the web, mobile terminal or WeChat official account, and the system also provides a background management interface to facilitate the management of movies, performances and seats.

Requirements analysis

The main requirements of the system include the following aspects:

1. User login and registration: Users can log in and register through mobile phone number or WeChat official account.
2. Movie and scene management: Administrators can add, delete, and modify movie and show information in the background management interface.
3. Seat selection and payment: Users can select movies, sessions and seats on the web or mobile and pay online.
4. Ticket generation and management: The system can generate electronic tickets and provide ticket inquiry and management functions.
5. System logging and analysis: The system can record user and administrator operation logs and provide analysis and reporting capabilities.

To achieve these requirements, we need to do the following:

1. Design and implement data models, including data objects such as movies, shows, seats, users, orders, and more.
2. Design and implement business logic, including user registration, movie management, seat selection, payment, and other business processes.
3. Design and implement web interfaces, including web or mobile interfaces such as user login, movie listings, seat selection, and order confirmation.
4. Design and implement background management interfaces, including movie management, scene management, order management and other management interfaces.
5. Integrate and configure the Thymeleaf template engine for better rendering and display of data.
6. Integrate and configure the Spring Boot framework and MySQL database for better business logic and data management.

In general, this is a complex Thymeleaf practical case, which requires us to have strong business understanding and technical capabilities in order to better implement requirements and achieve optimization.

Please do a Thymeleaf practical design and implementation page layout

Okay, here’s a simple Thymeleaf real-world page layout design and implementation.

Page layout design

This example is a movie booking system that mainly includes the following pages:

• Login page: Users can enter their username and password on this page to log in.
• Registration page: Users can enter their username, password, and personal information on this page to register.
• Movie List Page: Users can view the movie list on this page and select a movie for ticket booking.
• Movie details page: Users can view movie details and show information on this page, and select the number of shows and seats for ticket booking.
• Order confirmation page: Users can view order information and make payments on this page.
• Order inquiry page: Users can query the purchased order information on this page.
• Background management page: Administrators can manage movies and shows on this page.

To make the page layout clearer, cleaner, and easier to use, we can apply the following design principles:

1. Unified navigation bar: A navigation bar is placed at the top of each page to facilitate users to switch and operate pages.
2. Appropriate white space: Appropriately increase white space in the page layout to make the page more comfortable and easy to use.
3. Clear page structure: Use clear structure and layout in page layout, so that users can quickly find the information and actions they need.
4. Optimized responsive design: Adopt responsive design in page layouts so that pages display and use well across devices and screen sizes.

Page layout implementation

To implement the page layout, we need to use the Thymeleaf template engine and the Bootstrap framework. Here’s an example of a simple page layout:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title th:text="${pageTitle}">电影订票系统</title>
    <link rel="stylesheet" th:href="@{/css/bootstrap.min.css}">
    <link rel="stylesheet" th:href="@{/css/custom.css}">
    <script th:src="@{/js/jquery.min.js}"></script>
    <script th:src="@{/js/bootstrap.min.js}"></script>
</head>

<body>
    <nav class="navbar navbar-expand-md navbar-dark bg-dark">
        <div class="container">
            <a class="navbar-brand" th:href="@{/}">电影订票系统</a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav"
                aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarNav">
                <ul class="navbar-nav mr-auto">
                    <li class

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… </ul> <ul class=”navbar-nav”> <li class=”nav-item”> <a class=”nav-link” th:href=”@{/cart}”> <i class=”fa fa-shopping-cart”></i> 购物车 <span class=”badge badge-pill badge-secondary”>3</span> </a> </li> <li class=”nav-item”> <a class=”nav-link” th: href=”@{/orders}”> <i class=”fa fa-list”></i> 订单 </a> </li> <li class=”nav-item dropdown”> <a class=”nav-link dropdown-toggle” href=”#” id=”navbarDropdown” role=”button” data-toggle=”dropdown” aria-haspopup=”true” aria-expanded=”false”> <i class=”fa fa-user”></i> 用户名 </a> <div class=”dropdown-menu dropdown-menu-right” aria-labelledby=”navbarDropdown”> <a class=”dropdown-item” th: href=”@{/profile}”><i class=”fa fa-user-circle”></i> 个人信息</a> <a class=”dropdown-item” th:href=”@{/logout}”><i class=”fa fa-sign-out”></i> 注销</a> </div> </li> </ul> </div> </div> </nav>

phpCopy code<div class="container mt-4">
    <div layout:fragment="content"></div>
</div>

<script th:src="@{/js/custom.js}"></script>

</body> </html> “`

In this page layout, we used the Bootstrap framework to implement responsive layout and styling. Thymeleaf’s expressions are used in the page to dynamically generate page content and data, making the page more flexible and useful. The layout:fragment directive is used in the page to define the page fragment, and the layout:decorate directive is used in the child pages to reference the layout page. This approach makes the page structure cleaner and easier to maintain.

Overall, Thymeleaf page layout is a very important part that requires us to use the right technology and tools to implement it according to actual needs and design principles. In the implementation process, we should pay attention to the design, responsive layout, and code maintainability of the page to better implement business needs and user experience.

Please do a Thymeleaf practical case implementation data display and operation

Okay, the following is a simple Thymeleaf practical case implementation data display and operation.

Implement data presentation

In this case, we need to get the movie, number of shows, seats, etc. data from the database and display it on the page. To achieve data presentation, we can use the Thymeleaf template engine and Spring Boot framework to implement it. Here’s an example implementation of a simple movie listing page:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
    layout:decorate="~{layouts/default}">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title th:text="${pageTitle}">电影列表</title>
</head>

<body>
    <div layout:fragment="content">
        <div class="row">
            <div class="col-md-8">
                <h2>电影列表</h2>
            </div>
            <div class="col-md-4">
                <form th:action="@{/movies}" method="get">
                    <div class="input-group mb-3">
                        <input type="text" class="form-control" placeholder="请输入电影名称" name="q"
                            th:value="${query}">
                        <div class="input-group-append">
                            <button class="btn btn-primary" type="submit">搜索</button>
                        </div>
                    </div>
                </form>
            </div>
        </div>

        <div class="row">
            <div class="col-md-12">
                <table class="table table-hover">
                    <thead>
                        <tr>
                            <th>#</th>
                            <th>电影名称</th>
                            <th>导演</th>
                            <th>主演</th>
                            <th>上映时间</th>
                            <th>票价</th>
                            <th></th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr th:each="movie : ${movies}">
                            <td th:text="${movie.id}"></td>
                            <td th:text="${movie.name}"></td>
                            <td th:text="${movie.director}"></td>
                            <td th:text="${movie.actors}"></td>
                            <td th:text="${#dates.format(movie.releaseDate, 'yyyy-MM-dd HH:mm')}"></td>
                            <td th:text="${movie.price}"></td>
                            <td>
                                <a class="btn btn-primary btn-sm"
                                    th:href="@{/movies/{id}/sessions(id=${movie.id})}">查看场次</a>
                            </td>
                        </tr>
                    </tbody>
                </table>
            </div>
        </div>
    </div>
</body>

</html>

In this page, we used Thymeleaf’s th:each directive to iterate through the list of movies, and Thymeleaf’s expressions to dynamically generate page content and data. When presenting date data, we used Thymeleaf’s date formatting feature to make date data easier to read and understand. The Bootstrap framework is used in the page to implement responsive layout and styling, making the page on different devices and screens

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It can be displayed normally on the screen. Use Thymeleaf’s expression in the search box to set search keywords, so that users can quickly find the movies they need based on keywords.

Implement data manipulation

In this case, we need to implement operations such as adding, editing, and deleting movie scenes, so that administrators can manage movie and scene data. To implement data manipulation, we can implement it using Thymeleaf Forms and the Controller and Service components of the Spring Boot framework. Here’s an example implementation of a simple movie scene addition page:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
    layout:decorate="~{layouts/default}">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title th:text="${pageTitle}">添加电影场次</title>
</head>

<body>
    <div layout:fragment="content">
        <h2>添加电影场次</h2>

        <form th:action="@{/movies/{id}/sessions(id=${movie.id})}" method="post">
            <input type="hidden" name="movieId" th:value="${movie.id}">
            <div class="form-group">
                <label for="name">场次名称</label>
                <input type="text" class="form-control" id="name" name="name" th:value="${session?.name}"
                    placeholder="请输入场次名称" required>
            </div>
            <div class="form-group">
                <label for="hall">放映厅</label>
                <input type="text" class="form-control" id="hall" name="hall" th:value="${session?.hall}"
                    placeholder="请输入放映厅" required>
            </div>
            <div class="form-group">
                <label for="startTime">开始时间</label>
                <input type="datetime-local" class="form-control" id="startTime" name="startTime"
                    th:value="${#dates.format(session?.startTime, 'yyyy-MM-ddTHH:mm')}" required>
            </div>
            <div class="form-group">
                <label for="endTime">结束时间</label>
                <input type="datetime-local" class="form-control" id="endTime" name="endTime"
                    th:value="${#dates.format(session?.endTime, 'yyyy-MM-ddTHH:mm')}" required>
            </div>
            <button type="submit" class="btn btn-primary">保存</button>
            <a class="btn btn-secondary" th:href="@{/movies/{id}/sessions(id=${movie.id})}">取消</a>
        </form>
    </div>
</body>

</html>

On this page, we used a Thymeleaf form to add movie scenes. Use Thymeleaf’s expressions in the form to set the movie ID and show data, and use Thymeleaf’s conditional expressions to determine if the show is empty. Use Thymeleaf’s expression in the input box to set the default value of the input box so that administrators can edit the session data more easily. When submitting the form, we used Thymeleaf’s expression to set the URL of the form submission, and

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The POST method was used to submit form data. In Save Button, we used Thymeleaf’s expression to set the text and style of the button, making the button more intuitive and easy to understand. In the cancel button, we used Thymeleaf’s expression to set the URL of the button, allowing the administrator to return to the movie scene list page.

In Spring Boot, we can use @Controller and @RequestMapping annotations to implement web request handling and data binding. Here’s a simple example of a Controller:

javaCopy code@Controller
@RequestMapping("/movies/{movieId}/sessions")
public class SessionController {

    private final SessionService sessionService;

    @Autowired
    public SessionController(SessionService sessionService) {
        this.sessionService = sessionService;
    }

    @GetMapping
    public String list(@PathVariable("movieId") Long movieId, @RequestParam(value = "q", required = false) String query,
            Model model) {
        List<Session> sessions = sessionService.findByMovieId(movieId);
        model.addAttribute("movie", sessionService.findMovieById(movieId));
        model.addAttribute("sessions", sessions);
        model.addAttribute("query", query);
        model.addAttribute("pageTitle", "电影场次列表");
        return "sessions/list";
    }

    @GetMapping("/new")
    public String createForm(@PathVariable("movieId") Long movieId, Model model) {
        model.addAttribute("movie", sessionService.findMovieById(movieId));
        model.addAttribute("session", new Session());
        model.addAttribute("pageTitle", "添加电影场次");
        return "sessions/form";
    }

    @PostMapping
    public String create(@PathVariable("movieId") Long movieId, @ModelAttribute("session") Session session) {
        session.setMovie(sessionService.findMovieById(movieId));
        sessionService.saveSession(session);
        return "redirect:/movies/" + movieId + "/sessions";
    }

    // 省略其他方法
}

In this controller, we use @GetMapping annotations to handle GET requests, @PostMapping annotations to handle POST requests, @PathVariable annotations to get URL parameters, @RequestParam annotations to get request parameters, @ModelAttribute annotations to bind form data, and Model objects to pass data to the view. In the list method, we call sessionService to get the list of movie scenes and store it in the Model object for presentation in the view. In the createForm method, we create a new session object and store it in the Model object for presentation in the view. In the create method, we use sessionService to save the show data, and use redirects to jump to the movie scene list page.

Through the above implementation, we can implement a simple Thymeleaf practical case to display and manipulate movie and scene data.

Please do a Thymeleaf practical case form validation and submission processing

In this Thymeleaf case, we’ll add form validation and submission processing so that administrators can more easily manage movie and show data.

Form validation

In this case, we need to validate the form data for movies and performances to ensure that the data is correct. To implement form validation, we can use Thymeleaf’s form validation and Spring Boot framework’s validation components.

Here’s an example implementation of a simple movie add form:

htmlCopy code<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
    layout:decorate="~{layouts/default}">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title th:text="${pageTitle}">添加电影</title>
</head>

<body>
    <div layout:fragment="content">
        <h2>添加电影</h2>

        <form th:action="@{/movies}" method="post" th:object="${movieForm}">
            <div class="form-group">
                <label for="title">电影名称</label>
                <input type="text" class="form-control" id="title" name="title" th:value="*{title}"
                    placeholder="请输入电影名称" required>
                <span class="help-block" th:if="${#fields.hasErrors('title')}"
                    th:errors="*{title}"></span>
            </div>
            <div class="form-group">
                <label for="genre">电影类型</label>
                <input type="text" class="form-control" id="genre" name="genre" th:value="*{genre}"
                    placeholder="请输入电影类型" required>
                <span class="help-block" th:if="${#fields.hasErrors('genre')}"
                    th:errors="*{genre}"></span>
            </div>
            <div class="form-group">
                <label for="director">导演</label>
                <input type="text" class="form-control" id="director" name="director" th:value="*{director}"
                    placeholder="请输入导演名称" required>
                <span class="help-block" th:if="${#fields.hasErrors('director')}"
                    th:errors="*{director}"></span>
            </div>
            <div class="form-group">
                <label for="description">电影简介</label>
                <textarea class="form-control" id="description" name="description" rows="3"
                    th:value="*{description}" required></textarea>
                <span class="help-block" th:if="${#fields.hasErrors('description')}"
                    th:errors="*{description}"></span>
            </div>
            <button type="submit" class="btn btn-primary">保存</button>
            <a class="btn btn-secondary" th:href="@{/movies}">取消</a>
        </form>
    </div>
</body>

</html>

In this page, we used a Thymeleaf form and conditional expressions to display and validate the movie addition form. Use Thymeleaf’s expressions in the form to set the movie form data, and use Thymeleaf’s conditional expressions

Please continue

to determine whether there is an error in the form data, and if there is an error, an error message will be displayed below the corresponding form item.

In Spring Boot, we can use annotations to validate form data. The following is an example implementation of a simple movie form validation:

javaCopy codepublic class MovieForm {

    @NotBlank(message = "电影名称不能为空")
    private String title;

    @NotBlank(message = "电影类型不能为空")
    private String genre;

    @NotBlank(message = "导演不能为空")
    private String director;

    @NotBlank(message = "电影简介不能为空")
    private String description;

    // 省略getter和setter方法
}

In this example, we used @NotBlank annotations to set validation rules for movie form data, and if the form data is empty, an error message is displayed.

Submission for processing

In this case, we also need to implement the submission processing of movie and show form data so that the administrator can save the movie and show data to the database. In order to realize the submission processing of form data, we can add processing methods to process form data in the Controller.

Here’s an example implementation of a simple movie add processing method:

javaCopy code@PostMapping
public String create(@ModelAttribute("movieForm") @Validated MovieForm movieForm, BindingResult result) {
    if (result.hasErrors()) {
        return "movies/form";
    }
    Movie movie = new Movie();
    movie.setTitle(movieForm.getTitle());
    movie.setGenre(movieForm.getGenre());
    movie.setDirector(movieForm.getDirector());
    movie.setDescription(movieForm.getDescription());
    movieService.saveMovie(movie);
    return "redirect:/movies";
}

In this example, we use @ModelAttribute annotations to bind form data, @Validated annotations to trigger form validation, and BindingResult objects to get form validation results. If there is an error in the form validation, it will be redirected to the movie add form page and display the error message. If the form is validated, a new movie object is created and saved to the database. Finally, use redirects to jump to the movie listing page.

Through the above implementation, we can implement a simple Thymeleaf practical case to display and manipulate movie and scene data, and implement the functions of form validation and submission processing.

Please explain in detail how to complete the development and testing of the entire case

To complete the development and testing of Thymeleaf’s actual combat case, you need to follow the steps below:

1. Identify requirements and features

Before developing a Thymeleaf combat case, we need to identify the requirements and functionality. In this example, we need to implement a web application for movie and scene management, which can display and manipulate movie and session data, as well as implement form validation and submission processing. In order to achieve this, we need to clarify the specific functional requirements and implementation methods.

2. Create a Spring Boot project

After identifying the requirements and features, we can create a new Spring Boot project using Spring Initializr. When creating a project, you need to choose Thymeleaf and Spring Web as dependencies for subsequent implementation of Thymeleaf views and web interfaces.

3. Implement the data model and data access layer

After creating the project, we need to implement the data model and data access layer to be able to access and manipulate movie and scene data. In this case, we can use JPA and Hibernate to implement the data access layer, and two entity classes, Movie and Screening, to represent movie and scene data.

4. Implement the service layer and control layer

Now that the data model and data access layers are implemented, we can start implementing the service layer and the control layer to be able to handle business logic and accept and respond to user requests. In this example, we can implement two service classes, MovieService and ScreeningService, to handle the business logic of movie and scene data, and implement two controllers, MovieController and ScreeningController, to handle web requests and responses.

5. Implement the Thymeleaf view

After implementing the service layer and control layer, we can start implementing the Thymeleaf view to be able to display movie and scene data, as well as implement form validation and submission processing. In this example, we can implement two HTML pages, movies and screenings, to display movie and scene data, and two HTML pages, movies/form and screenings/form, to display and verify movie and scene forms.

6. Implement web security and permission control

After implementing the business functions and Thymeleaf views, we need to consider the issues of web security and permission control. In order to ensure the security of web applications, we can implement Spring Security for user authentication and authorization, as well as to prevent web attacks and malicious behavior.

7. Conduct unit and integration tests

After all the features are implemented, we need to do unit tests and integration tests to ensure the correctness and stability of the application. In this example, we can use JUnit and Mockito for unit testing and Selenium for integration testing.

8. Deploy and run the app

After testing, we can deploy the app to production and run the app to provide the service. In order to deploy and run the application, we can choose

Please continue

Deploy applications to cloud service providers or their own servers, and also configure related environments such as databases and web servers.

When deploying and running applications, we need to ensure that the application can run stably, and handle and fix problems and exceptions in a timely manner. To ensure the stability and reliability of the application, we can implement logging and error handling mechanisms to quickly diagnose and solve problems.

9. Perform performance testing and optimization

After the application is deployed and running, we need to perform performance testing and optimization to ensure high performance and low latency of the application. In this example, we can use JMeter for performance testing, using various techniques to optimize application performance, such as caching, asynchronous processing, load balancing, etc.

Through the above steps, we can complete the development and testing of a Thymeleaf practical case to display and manipulate movie and scene data, and implement form validation and submission processing.