Utilize Java frameworks and front-end frameworks to achieve cross-platform development

Implementation of cross-platform development: Cross-platform development can be achieved using a Java framework (Spring Boot) and a front-end framework (such as React), thereby using a set of code bases to create applications that can run on multiple platforms. Practical example: Creating a Java backend (Spring Boot): Establishing a WebSocket connection using a WebSocket controller and a server endpoint. Create the frontend (React): Use the socket.io-client library to handle WebSocket connections and connect to the Java backend server endpoint. Integrate backend and frontend: start the backend application, use useEffect on the frontend to mount the WebSocket component, connect to the server endpoint, and process the message.

Use Java framework and front-end framework to achieve cross-platform development

Cross-platform development refers to creating products that can run on multiple platforms The application software development process. It allows developers to use one code base, saving time and effort. Java and front-end frameworks like React, Angular, and Vue.js are powerful tools for cross-platform development.

Practical Case

Let us create a simple cross-platform chat application that uses Spring Boot as the Java framework and React as the front-end framework.

Java Backend (Spring Boot)

1. Create a new Spring Boot project.

2. Add the following dependencies:

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

3. Create a WebSocket controller:

   @RestController
   public class WebSocketController {
   
    @PostMapping("/chat")
    public void sendMessage(@RequestBody Message message) {
        // 发送消息
    }
   }

4. Create a WebSocket server Endpoint:

   @ServerEndpoint("/chat")
   public class WebSocketEndpoint {
   
    @OnOpen
    public void onOpen(Session session) {
        // 在 WebSocket 连接时调用
    }
   
    @OnMessage
    public void onMessage(Session session, String message) {
        // 在收到 WebSocket 消息时调用
    }
   }

Front End (React)

1. Create a new React project using npm.

2. Install the following dependencies:

   npm install socket.io-client

3. Create a component to handle WebSocket connections:

   import { useEffect, useState } from "react";
   import io from "socket.io-client";
   
   const WebSocketComponent = () => {
    const [socket, setSocket] = useState(null);
   
    useEffect(() => {
        const newSocket = io();
        setSocket(newSocket);
    }, []);
   
    return (
        <div>
            {/* WebSocket logic */}
        </div>
    );
   };

# #Integrate backend and frontend

Start the Spring Boot application on the backend.
1. On the front end, use
2. useEffect to mount the WebSocket component.
Connect to the Spring Boot WebSocket server endpoint in the front-end component.
3. On the backend, handle messages from the frontend and respond accordingly.

By following these steps, you can create a simple cross-platform chat application that can run on web, mobile, and desktop platforms.

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