spring boot 使用websocket

1、pom.xml中添加依赖：

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

2、添加web socket配置（要被spring扫描到）：

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、在java项目中添加WebSocketServer：

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

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

@Slf4j
//@ServerEndpoint("/websocket/{user}")
@ServerEndpoint(value = "/websocket")
@Component
public class WebSocketServer {
    //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 CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    //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
        addOnlineCount();           //在线数加1
        log.info("有新连接加入！当前在线人数为" + getOnlineCount());
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }


    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        log.info("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) {
       log.info("来自客户端的消息:" + message);

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

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


    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


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

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

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

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

4、html页面中添加相应js代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket</title>
    <script type="text/javascript" src="lib/jquery/1.9.1/jquery.min.js"></script>
    <script src="static/js/sockjs.min.js"></script>
    <script src="static/js/stomp.min.js"></script>


</head>
<body>
<h1>WebSocket 测试</h1>
<br>
<h2>去看控制台</h2>

</body>
<script>
    var socket;
    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");
    }

    socket = new WebSocket(getWsPath());//这里要注意路径问题，要与WebSocketServer相对应（项目名+路径）
    //打开事件
    socket.onopen = function() {
        console.log("Socket 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    调后台获取
    };
    //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");
    }
    $(window).unload(function(){
        socket.close();
    });
function getWsPath(){
    var host = window.location.host;   //主机IP:port
    var path = window.document.location.pathname;//端口后的路径
    var projectName = path.substring(0,path.substr(1).indexOf("/")+1);//项目名
    return "ws://"+host+projectName+"/websocket";
}
</script>
</html>

5、测试

@RequestMapping(value="/pushVideoListToWeb")
public void pushVideoListToWeb(String code) throws IOException {

    try {
        WebSocketServer.sendInfo("你瞅啥？！");

    }catch (IOException e) {
        log.info("websocket通信失败");
    }
}

spring boot 使用websocket

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