How to use Java to develop a Web application based on Spring MVC

Overview
Spring MVC is a mature Java Web application framework based on MVC (model- View-Controller) pattern can simplify the web application development process. This article will introduce how to develop a simple web application using Java and Spring MVC, with specific code examples.

Step 1: Environment setup
First, we need to ensure that the following environment has been installed:

1. Java development environment (JDK)
2. Maven build tool
3. An integrated development environment (IDE), such as Eclipse or IntelliJ IDEA
4. Tomcat server (you can choose other servers, such as Jetty)

Step 2: Create a Maven project
Create a Maven project in the IDE, select the appropriate Java version and the skeleton of the Web project. This will automatically generate some necessary dependencies and basic configuration for you.

Step 3: Add Spring MVC dependencies
Edit the project'spom.xmlfile and add Spring MVC dependencies. As shown below:

   org.springframework spring-webmvc 5.3.9  

Step 4: Configure Spring MVC
Create aweb.xmlfile in the root directory of the project and configure Spring MVC's DispatcherServlet. As shown below:

  dispatcher org.springframework.web.servlet.DispatcherServlet  contextConfigLocation /WEB-INF/applicationContext.xml  1   dispatcher /  

This will hand over all incoming requests toDispatcherServletfor processing.

Step 5: Create Controller
Create a Controller class in the project to process requests and return responses. For example, create a simpleHelloControllerclass as follows:

@Controller public class HelloController { @RequestMapping("/") public String hello() { return "hello"; } }

In this example, the@Controllerannotation identifies this as a controller class,@RequestMappingThe annotation defines the URL path corresponding to this method.

Step 6: Create View
Create aviewsdirectory under theWEB-INFdirectory of the project, and create ahello.jsp in itdocument. This will be the view used to display the user's return. For example,hello.jspmay look like this:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>     
  
Hello Spring MVC!
  

Step 7: Configure the view resolver
Edit the project'sapplicationContext.xmlfile and configure Spring View resolver for MVC. As shown below:

This will tell Spring MVC to look for the view file in the/WEB-INF/views/directory and add the.jspsuffix.

Step 8: Deploy and run the application
Use Maven to package the project as a WAR file and deploy it to the Tomcat server. After starting Tomcat, visithttp://localhost:8080/to see the "Hello Spring MVC!" page.

Conclusion
By following the above steps, you can develop a simple web application using Java and Spring MVC. Of course, the above examples only introduce basic settings and usage. Spring MVC has many other features and advanced usage, which can be learned in depth through official documentation and other resources. I wish you success in Java web development!

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