SpringBoot 整合websocket

Posted 2022-04-24 javahxm

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1、MyWebSocket

package org.hxm.webSocket;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

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

import org.springframework.stereotype.Component;

@ServerEndpoint(value = "/websocket")
@Component
public class MyWebSocket 

    // 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static AtomicInteger onlineCount = new AtomicInteger(0);

    // concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();

    // 与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) 
        this.session = session;
        webSocketSet.add(this); // 加入set中
        onlineCount.incrementAndGet(); // 在线数加1
        System.out.println("有新连接加入！当前在线人数为" + getOnlineCount());
        try 
            sendMessage("有新连接加入");
         catch (IOException e) 
            System.out.println("IO异常");
        
    

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() 
        webSocketSet.remove(this); // 从set中删除
        onlineCount.decrementAndGet(); // 在线数减1
        System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
    

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     *            客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) 
        System.out.println("来自客户端的消息:" + message);

        // 群发消息
        for (MyWebSocket item : webSocketSet) 
            try 
                item.sendMessage(message);
             catch (IOException e) 
                e.printStackTrace();
            
        
    

    /**
     * 发生错误时调用
     */
    @OnError
    public void onError(Session session, Throwable error) 
        System.out.println("发生错误");
        error.printStackTrace();
    

    public void sendMessage(String message) throws IOException 
        this.session.getBasicRemote().sendText(message);
        // this.session.getAsyncRemote().sendText(message);
    

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message) throws IOException 
        for (MyWebSocket item : webSocketSet) 
            try 
                item.sendMessage(message);
             catch (IOException e) 
                continue;
            
        
    

    public static synchronized int getOnlineCount() 
        return onlineCount.getAndIncrement();

2、WebSocketConfig

package org.hxm.webSocket;

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

@Configuration
public class WebSocketConfig 
     @Bean
        public ServerEndpointExporter serverEndpointExporter() 
            return new ServerEndpointExporter();

3、Application

package org.hxm.webSocket;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Scanner;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application 

    public static void main(String[] args) throws InterruptedException 
        SpringApplication.run(Application.class, args);

4、Test.html

<html>
<head>
    <title>My WebSocket</title>
</head>

<body>
Welcome<br/>
<input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;

    //判断当前浏览器是否支持WebSocket
    if(‘WebSocket‘ in window)
        websocket = new WebSocket("ws://localhost:8080/websocket");
    
    else
        alert(‘Not support websocket‘)
    

    //连接发生错误的回调方法
    websocket.onerror = function()
        setMessageInnerHTML("error");
    ;

    //连接成功建立的回调方法
    websocket.onopen = function(event)
        setMessageInnerHTML("open");
    

    //接收到消息的回调方法
    websocket.onmessage = function(event)
        setMessageInnerHTML(event.data);
    

    //连接关闭的回调方法
    websocket.onclose = function()
        setMessageInnerHTML("close");
    

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function()
        websocket.close();
    

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML)
        document.getElementById(‘message‘).innerHTML += innerHTML + ‘<br/>‘;
    

    //关闭连接
    function closeWebSocket()
        websocket.close();
    

    //发送消息
    function send()
        var message = document.getElementById(‘text‘).value;
        websocket.send(message);
    
</script>
</html>

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