SpringBoot及SpringCloud实现webSocket群发及单点发送

引入3个文件

1.WebSocketConfig

package com.eastops.system.Interceptor;

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();
    }
}

2.WebSocketServer

package com.eastops.system.Interceptor;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.eastops.common.core.utils.StringUtils;
import com.eastops.common.log.annotation.Log;
import com.eastops.system.controller.AppVersionController;
import org.apache.catalina.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@ServerEndpoint("/imserver/{userId}")
@Component
public class WebSocketServer {

    private  static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);

    /**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 int onlineCount = 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 ConcurrentHashMap<String,WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**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;
    /**接收userId*/
    private String userId="";

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId=userId;
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            webSocketMap.put(userId,this);
            //加入set中
        }else{
            webSocketMap.put(userId,this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }

        log.info("用户连接:"+userId+",当前在线人数为:" + getOnlineCount());

        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("用户:"+userId+",网络异常!!!!!!");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        log.info("用户退出:"+userId+",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) {
        log.info("用户消息:"+userId+",报文:"+message);
        //可以群发消息
        //消息保存到数据库、redis
        if(StringUtils.isNotBlank(message)){
            try {
                //解析发送的报文
                JSONObject jsonObject = JSON.parseObject(message);
                //追加发送人(防止串改)
                jsonObject.put("fromUserId",this.userId);
                String toUserId=jsonObject.getString("toUserId");
                //传送给对应toUserId用户的websocket
                if(StringUtils.isNotBlank(toUserId)&&webSocketMap.containsKey(toUserId)){
                    webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
                }else{
                    log.error("请求的userId:"+toUserId+"不在该服务器上");
                    //否则不在这个服务器上，发送到mysql或者redis
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:"+this.userId+",原因:"+error.getMessage());
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }



    /**
     * 群发消息
     * @param message
     * @throws IOException
     */
    public static void BroadCastInfo(String message) throws IOException {

        for (Map.Entry<String, WebSocketServer> stringWebSocketServerEntry : webSocketMap.entrySet()) {

            stringWebSocketServerEntry.getValue().sendMessage(message);

        }




//         ------     形式2    -------
//        webSocketMap.forEach((k,v) -> {
//            try {
//                v.sendMessage(message);
//            } catch (IOException e) {
//                e.printStackTrace();
//            }
//        });
    }



    /**
     * 发送自定义消息
     * */
    public static void sendInfo(String message,@PathParam("userId") String userId) throws IOException {
        log.info("发送消息到:"+userId+"，报文:"+message);
        if(StringUtils.isNotBlank(userId)&&webSocketMap.containsKey(userId)){
            webSocketMap.get(userId).sendMessage(message);
        }else{
            log.error("用户"+userId+",不在线！");
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}

3、SendPassagesController

package com.eastops.system.controller.screen;

import com.eastops.system.Interceptor.WebSocketServer;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import java.io.IOException;

@RestController
public class SendPassagesController {

    @GetMapping("index")
    public ResponseEntity<String> index(){
        return ResponseEntity.ok("请求成功");
    }

    @GetMapping("page")
    public ModelAndView page(){
        return new ModelAndView("websocket");
    }

    /**
     * 定点单发
     * @param message
     * @param toUserId
     * @return
     * @throws IOException
     */
    @RequestMapping("/push/{toUserId}")
    public ResponseEntity<String> pushToWeb(String message, @PathVariable String toUserId) throws IOException {
        WebSocketServer.sendInfo(message,toUserId);
        return ResponseEntity.ok("MSG SEND SUCCESS");
    }

    /**
     * 群发
     * @param msg
     * @throws IOException
     */
    @RequestMapping("/broadcast")
    public void broadcast(String msg) throws IOException {

    WebSocketServer.BroadCastInfo(msg);

    }

}

4.前端页面 (注意改一下)


1631525617(1).jpg
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>websocket通讯</title>
</head>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
  var socket;
  function openSocket() {
    if(typeof(WebSocket) == "undefined") {
      console.log("您的浏览器不支持WebSocket");
    }else{
      console.log("您的浏览器支持WebSocket");
      //实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接
      //等同于socket = new WebSocket("ws://localhost:8888/xxxx/im/25");
      //var socketUrl="${request.contextPath}/im/"+$("#userId").val();
      var socketUrl="http://localhost:8080/system/imserver/"+$("#userId").val();
      socketUrl=socketUrl.replace("https","ws").replace("http","ws");
      console.log(socketUrl);
      if(socket!=null){
        socket.close();
        socket=null;
      }
      socket = new WebSocket(socketUrl);
      //打开事件
      socket.onopen = function() {
        console.log("websocket已打开");
        //socket.send("这是来自客户端的消息" + location.href + new Date());
      };
      //获得消息事件
      socket.onmessage = function(msg) {
        console.log(msg.data);
        //发现消息进入    开始处理前端触发逻辑
      };
      //关闭事件
      socket.onclose = function() {
        console.log("websocket已关闭");
      };
      //发生了错误事件
      socket.onerror = function() {
        console.log("websocket发生了错误");
      }
    }
  }
  function sendMessage() {
    if(typeof(WebSocket) == "undefined") {
      console.log("您的浏览器不支持WebSocket");
    }else {
      console.log("您的浏览器支持WebSocket");
      console.log('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
      socket.send('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
    }
  }
</script>
<body>
<p>【userId】：<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【toUserId】：<div><input id="toUserId" name="toUserId" type="text" value="20"></div>
<p>【toUserId】：<div><input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>【操作】：<div><a onclick="openSocket()">开启socket</a></div>
<p>【操作】：<div><a onclick="sendMessage()">发送消息</a></div>
</body>

</html>

vue版本自行百度

1631525835(1).jpg

后端向前端推送数据


1631525868(1).jpg

1631525907(1).jpg
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