SpringBoot使用WebSocket

目录

[TOC]

参考

https://blog.csdn.net/hjq_ku/article/details/127503180

依赖

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

配置类

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

/**
 * WebSocket自动配置类
 */
@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {

        return new ServerEndpointExporter();
    }
}

WebSocket处理类

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.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * websocket服务
 */
@Component
@ServerEndpoint("/websocket/{userId}")
public class WebSocketServiceImpl {
    /**
     * 日志工具
     */
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    /**
     * 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;
    /**
     * 用户id
     */
    private String userId;
    /**
     * 用来存放每个客户端对应的MyWebSocket对象
     */
    private static CopyOnWriteArraySet<WebSocketServiceImpl> webSockets = new CopyOnWriteArraySet<>();
    /**
     * 用来存在线连接用户信息
     */
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<String, Session>();

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            sessionPool.put(userId, session);
            logger.info("【websocket消息】有新的连接，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            logger.info("【websocket消息】连接断开，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     */
    @OnMessage
    public void onMessage(String message) {
        logger.info("【websocket消息】收到客户端消息:" + message);
    }

    /**
     * 发送错误时的处理
     */
    @OnError
    public void onError(Session session, Throwable error) {
        logger.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 此为广播消息
     */
    public void sendAllMessage(String message) {
        logger.info("【websocket消息】广播消息:" + message);
        for (WebSocketServiceImpl webSocket : webSockets) {
            try {
                if (webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 此为单点消息
     */
    public void sendOneMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        if (session != null && session.isOpen()) {
            try {
                logger.info("【websocket消息】 单点消息:" + message);
                session.getAsyncRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 此为单点消息(多人)
     */
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = sessionPool.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    logger.info("【websocket消息】 单点消息:" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }
}

给客户端返回消息接口

/**
 * 给客户端返回消息
 */
@RestController
@RequestMapping(value = "/api/v1/websocket")
@Api(tags = "websocket接口", value = "AlarmDpController")
public class WebSocketController {
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 模拟数据发送
     */
    @ApiOperation(value = "模拟数据发送", notes = "模拟数据发送")
    @ApiImplicitParams({
            @ApiImplicitParam(paramType = "query", name = "message", value = "模拟消息", required = true, dataType = "String"),
    })
    @RequestMapping(value = "/sendTestMessage", method = RequestMethod.GET)
    public void sendTestMessage(String message) {
        webSocketServer.sendAllMessage();
    }
}

前端

<!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>
    let socket;
    function openSocket() {
		const socketUrl = "ws://localhost:8003/websocket/admin";
        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");
        };
        //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() {

        socket.send('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
        console.log('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
    }
</script>
<body>
<p>【socket开启者的ID信息】：<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【客户端向服务器发送的内容】：<div><input id="toUserId" name="toUserId" type="text" value="20">
    <input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>【操作】：<button><a onclick="openSocket()">开启socket</a></button>
<p>【操作】：<button><a onclick="sendMessage()">发送消息</a></button>
</body>

</html>