springBoot 中webSocket 应用一

<html>
<head>
    <meta charset="UTF-8">
    <title>websocket测试</title>
    <style type="text/css">
        h3, h4 {
            text-align: center;
        }
    </style>
</head>
<body>
<h1>前端的信息查看控制台</h1>

<script type="text/javascript">
    var socket;
    if (typeof (WebSocket) == "undefined") {
        console.log("遗憾：您的浏览器不支持WebSocket");
    } else {
        console.log("恭喜：您的浏览器支持WebSocket");

        socket = new WebSocket("ws://localhost:8089/ws/asset");
        //连接打开事件
        socket.onopen = function () {
            console.log("Socket 已打开");
            socket.send("消息发送测试(From Client)");
        };
        //收到消息事件
        socket.onmessage = function (msg) {
            console.log("接收到的消息", msg.data);
        };
        //连接关闭事件
        socket.onclose = function () {
            console.log("Socket已关闭");
        };
        //发生了错误事件
        socket.onerror = function () {
            alert("Socket发生了错误");
        };

        //窗口关闭时，关闭连接
        window.unload = function () {
            socket.close();
        };
    }
</script>

</body>
</html>

View Code

package com.aiguigu.websocket.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
/**
如果是springBoot自带的嵌入式容器，则要开启
*/
@Configuration
public class WebGlobalConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

　定义webSocket类

package com.aiguigu.websocket.config;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

@ServerEndpoint(value = "/ws/asset")
@Component
public class MyWebSocket {
    private static Logger log = LoggerFactory.getLogger(MyWebSocket.class);
    /*自增操作*/
    private static final 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Session对象。
    private static CopyOnWriteArraySet<Session> SessionSet = new CopyOnWriteArraySet<Session>();

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        System.out.println("建立连接");
        SessionSet.add(session);
        // 在线数加1，并获取最后结果
        int cnt = OnlineCount.incrementAndGet();
        log.info("有连接加入，当前连接数为：{}", cnt);
        SendMessage(session, "连接成功xxxxx");
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        SessionSet.remove(session);
        int cnt = OnlineCount.decrementAndGet();
        log.info("有连接关闭，当前连接数为：{}", cnt);
    }

    /**
     * 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("来自客户端的消息：{}", message);
        SendMessage(session, "服务器发来的内容：" + message);
    }

    /**
     * 出现错误
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误：{}，Session ID： {}", error.getMessage(), session.getId());
        error.printStackTrace();
    }

    /**
     * 发送消息，实践表明，每次浏览器刷新，session会发生变化。
     *
     * @param session
     * @param message
     */
    public static void SendMessage(Session session, String message) {
        try {
            session.getBasicRemote().sendText(String.format("%s (From Server，Session ID=%s)", message, session.getId()));
        } catch (IOException e) {
            log.error("发送消息出错：{}", e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * 群发消息
     *
     * @param message
     * @throws IOException
     */
    public static void BroadCastInfo(String message) throws IOException {
        for (Session session : SessionSet) {
            //判断如果websocket链接如果是开启的情况下，则发送信息
            if (session.isOpen()) {
                SendMessage(session, message);
            }
        }
    }

    /**
     * 指定Session发送消息
     *
     * @param sessionId
     * @param message
     * @throws IOException
     */
    public static void SendMessage(String sessionId, String message) throws IOException {
        Session session = null;
        for (Session s : SessionSet) {
            if (s.getId().equals(sessionId)) {
                session = s;
                break;
            }
        }
        if (session != null) {
            SendMessage(session, message);
        } else {
            log.warn("没有找到你指定ID的会话：{}", sessionId);
        }
    }

}

　　定时发送

    @Scheduled(cron = "*/3 * * * * *")
    @ResponseBody
    @GetMapping("/websocke")
    public void webSocket() {
        String s = "hello world";
        try {
            MyWebSocket.BroadCastInfo(s);
        } catch (IOException e) {
            System.out.println("执行异常");
            e.printStackTrace();
        }
    }

　　入口文件开启

@SpringBootApplication
@EnableScheduling
public class WebsocketApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebsocketApplication.class, args);
    }

}

　　前端内容

springBoot 中webSocket 应用一

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