SpringBoot WebSocket实现

1.添加依赖

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

2.前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>webscoket</title>
</head>
<body>
    <script>
        var websocket = null;

        if('WebSocket' in window){
            websocket = new WebSocket("ws://localhost:8080/webSocket")
        }else{
            alert("该浏览器不支持websocket")
        }


        websocket.onopen = function(event){
            console.log('建立连接')
        }

        websocket.onclose = function(event){
            console.log('连接关闭')
        }

        websocket.onmessage = function(event){
            console.log('收到消息:'+event.data)
            document.body.innerHTML=event.data
        }

        websocket.onerror = function(){
            alert("websocket发生通信错误")
        }

        websocket.onbeforeunload = function(event){
            websocket.close()
        }
    </script>
</body>
</html>

3.后台代码

WebSocketConfig.java

package com.example.demo;

import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Component
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

WebSocket.java

package com.example.demo;

import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import org.springframework.stereotype.Component;

@Component
@ServerEndpoint("/webSocket")
public class WebSocket {
    
    private Session session;
    
    private static CopyOnWriteArraySet<WebSocket> webSocketSet = new CopyOnWriteArraySet<>();
    
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
        System.err.println("【websocket消息】 有新的连接，总数:"+webSocketSet.size());
    }
    
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        System.err.println("【websocket消息】 连接断开，总数:"+webSocketSet.size());
    }
    
    @OnMessage
    public void onMessage(String message) {
        System.err.println("【websocket消息】收到客户端发来的消息"+message);
    }
    
    public void sendMessage(String message) {
        for(WebSocket webSocket:webSocketSet) {
            System.err.println("【websocket消息】广播消息,message="+message);
            try {
                webSocket.session.getBasicRemote().sendText(message);
            }catch(Exception e) {
                e.printStackTrace();
            }
            
        }
    }
}

Controller.java

package com.example.demo;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Controller {

    @Autowired
    WebSocket websocket;
    
    @RequestMapping("/send")
    public String send(String message) {
        websocket.sendMessage(message);
        return "测试成功";
    }
}

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原文地址：https://www.cnblogs.com/shuaihan/p/8421174.html