springboot-websocket基础使用

话不多说直接上代码关于介绍websocket百度一大堆这里只作为个人学习笔记吧

依赖添加

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <version>1.3.5.RELEASE</version>
        </dependency>

穿件configer类

package com.zly.ws.websocket.confige;

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

/**
 * @Author zly
 * @Date 2018/11/6 11:22
 */
@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter(){
        return new ServerEndpointExporter();
    }
}

新建一个mywebsocket

package com.zly.ws.websocket.mywebsocket;

import com.zly.ws.websocket.entity.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @Author zly
 * @Date 2018/11/6 11:25
 */
@ServerEndpoint(value = "/websocket")
@Component
public class MyWebSocket {
    public static int onlineCount=0;
    public static CopyOnWriteArraySet<MyWebSocket> sockets=new CopyOnWriteArraySet<>();
    public Session session;
    public static Logger logger=LoggerFactory.getLogger(MyWebSocket.class);
    @OnOpen
    public void onOpen(Session session){
       //User user = (User)request.getSession().getAttribute("user");
        this.session = session;
        sockets.add(this);     //加入set中
        addOnlineCount();           //在线数加1
        //System.out.println("有新连接加入！当前在线人数为" + getOnlineCount());
        logger.info("链接加入！当前在线人数为"+getOnlineCount());
        try {
            sendMessage(CommonConstant.CURRENT_WANGING_NUMBER.toString());
        } catch (IOException e) {
            logger.info("IO异常");
        }
    }

    @OnClose
    public void onClose() {
        sockets.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        logger.info("有人退出了链接！在线人数是："+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) {
      logger.info("客户端发来了消息"+message);

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

    /**
     * 发生错误时调用
     @OnError
     */
     public void onError(Session session, Throwable error) {
     logger.info("发生了错误");
     error.printStackTrace();
     }


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


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

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

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

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

最后前端页面

这里是用的是thymleaf

<!DOCTYPE HTML>
<html>
<head>
    <title>My WebSocket</title>
</head>

<body>
Welcome {user.nickname}<br/>
<input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;

    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
        websocket = new WebSocket("ws://localhost:8080/websocket");
    }
    else{
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
    }

    //接收到消息的回调方法
    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function(){
        setMessageInnerHTML("close");
    }

    //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端会抛异常。
    window.onbeforeunload = function(){
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket(){
        websocket.close();
    }

    //发送消息
    function send(){
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>

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springboot-websocket基础使用

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