[网络协议]springboot集成websocket

直接上代码

server类

package com.src.xxx.websocket;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;



@ServerEndpoint("/websocket/{userId}")
@Component
@Slf4j
public class WebSocketServer {
    /**静态变量，用来记录当前在线连接数。*/
    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());
    }
//    @OnMessage
//    public void heart_beat(Session session) throws IOException {
//        log.info("用户心跳连接:"+this.userId);
//        webSocketMap.get(this.userId).sendMessage("websocket-heart-beat");
//    }
    /**
     * 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("用户心跳连接:"+this.userId);
        try {
            webSocketMap.get(this.userId).sendMessage("websocket-heart-beat-ok");
        }catch (Exception e){
            e.printStackTrace();
        }
//        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.isEmpty(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.isEmpty(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);
    }


    /**
     * 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.isEmpty(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--;
    }
}

对应config

package com.src.xxx;

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();
    }
}

maven包

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

目录结构如下?

?使用

WebSocketServer.sendInfo('123',id);//id就是连接id

测试html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket</title>

</head>
<body>
<h3>hello socket</h3>
<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="createWebSocket()">开启socket</a></div>
<p>【操作】：<div><a onclick="sendMessage()">发送消息</a></div>
</body>
<script>

var lockReconnect = false; //避免ws重复连接
var ws = null; //判断当前浏览器是否支持WebSocket
//createWebSocket(url);   //连接ws
 
function createWebSocket() {
	var userId = document.getElementById('userId').value;
	var url="ws://127.0.0.1:8080/websocket/"+userId;
    try {
        if ('WebSocket' in window) {
            ws = new WebSocket(url);
        } else if ('MozWebSocket' in window) {
            ws = new MozWebSocket(url);
        } else {
            alert("您的浏览器不支持websocket的协议，建议使用新版谷歌、火狐等浏览器，请勿使用IE10以下浏览器，360浏览器请使用极速模式")
        }
        initEventHandle();
    } catch(e) {
        reconnect(url);
        console.log(e);
    }
}
 
function initEventHandle() {
    ws.onclose = function() {
        reconnect(wsUrl);
        console.log("llws连接关闭!"+new Data().toUTCString());
    };
    ws.onerror = function() {
        reconnect(wsUrl);
        console.log("llws连接错误!");
    };
    ws.onopen = function() {
        heartCheck.reset().start(); //心跳检测重置
        console.log("llws连接成功!"+new Data().toUTCString());
    };
    ws.onmessage = function(event) {//如果获得到消息、心跳检测重置
        heartCheck.reset().start();    //拿到任何消息都说明当前连接是正常的
        console.log("llws收到消息啦:"+event.data);
    };
}
 
//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断会抛异常
window.onbeforeunload = function() {
    ws.close();
}
 
function reconnect(url) {
    if (lockReconnect) return;
    lockReconnect = true;
    setTimeout(function() { //没连接上会一直重连，设置延迟避免请求过多
        createWebSocket(url);
        lockReconnect = false;
    }, 2000);
}
 
//心跳检测
var heartCheck = {
    timeout: 500000,   //9分钟发一次心跳
    timeoutObj: null,
    serverTimeoutObj: null,
    reset: function() {
        clearTimeout(this.timeoutObj);
        clearTimeout(this.serverTimeoutObj);
        return this;
    },
    start: function() {
        var self = this;
        this.timeoutObj = setTimeout(function() {
            //这里发送一个心跳，后端收到后，返回一个心跳消息，
            //onmessage拿到返回的心跳就说明连接正常
            ws.send("ping");
            console.log("ping!");
            self.serverTimeoutObj = setTimeout(function() {//如果超过一定时间还没重置，说明后端主动断开了
                ws.close(); //如果onclose会执行reconnect，我们执行ws.close()就行了，如果直接执行reconnect会触发onclose导致重连两次
            }, self.timeout)
        }, this.timeout)
    }
}

    
    </script>
</html>