spting boot集成websorck

后端代码

maven

		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.websocket</groupId>
            <artifactId>javax.websocket-api</artifactId>
            <version>1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>27.1-jre</version>
        </dependency>
        
		如果spring去除了tomcat加入以下代码
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--去除内置tomcat-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- 移除之后会报错，加入下面的依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

核心代码

package com.demo.config;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Maps;
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.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author：JCccc
 * @Description：
 * @Date： created in 15:56 2019/5/13
 */

@Component
@ServerEndpoint(value = "/connectWebSocket/{userId}")
public class WebSocket {

    private Logger logger = LoggerFactory.getLogger(this.getClass());
    /**
     * 在线人数
     */
    public static int onlineNumber = 0;
    /**
     * 以用户的姓名为key，WebSocket为对象保存起来
     */
    private static Map<String, WebSocket> clients = new ConcurrentHashMap<String, WebSocket>();
    /**
     * 会话
     */
    private Session session;
    /**
     * 用户名称
     */
    private String userId;
    /**
     * 建立连接
     *
     * @param session
     */
    @OnOpen
    public void onOpen(@PathParam("userId") String userId, Session session)
    {
        onlineNumber++;
        logger.info("现在来连接的客户id："+session.getId()+"用户名："+userId);
        this.userId = userId;
        this.session = session;
      //  logger.info("有新连接加入！ 当前在线人数" + onlineNumber);
        try {
            //messageType 1代表上线 2代表下线 3代表在线名单 4代表普通消息
            //先给所有人发送通知，说我上线了
            Map<String,Object> map1 = Maps.newHashMap();
            map1.put("messageType",1);
            map1.put("userId",userId);
            sendMessageAll(JSON.toJSONString(map1),userId);

            //把自己的信息加入到map当中去
            clients.put(userId, this);
 logger.info("有连接关闭！ 当前在线人数" + clients.size());
            //给自己发一条消息：告诉自己现在都有谁在线
            Map<String,Object> map2 = Maps.newHashMap();
            map2.put("messageType",3);
            //移除掉自己
            Set<String> set = clients.keySet();
            map2.put("onlineUsers",set);
            sendMessageTo(JSON.toJSONString(map2),userId);
        }
        catch (IOException e){
            logger.info(userId+"上线的时候通知所有人发生了错误");
        }



    }

    @OnError
    public void onError(Session session, Throwable error) {
        logger.info("服务端发生了错误"+error.getMessage());
        //error.printStackTrace();
    }
    /**
     * 连接关闭
     */
    @OnClose
    public void onClose()
    {
        onlineNumber--;
        //webSockets.remove(this);
        clients.remove(userId);
        try {
            //messageType 1代表上线 2代表下线 3代表在线名单  4代表普通消息
            Map<String,Object> map1 = Maps.newHashMap();
            map1.put("messageType",2);
            map1.put("onlineUsers",clients.keySet());
            map1.put("userId",userId);
            sendMessageAll(JSON.toJSONString(map1),userId);
        }
        catch (IOException e){
            logger.info(userId+"下线的时候通知所有人发生了错误");
        }
        //logger.info("有连接关闭！ 当前在线人数" + onlineNumber);
          logger.info("有连接关闭！ 当前在线人数" + clients.size());
    }

    /**
     * 收到客户端的消息
     *
     * @param message 消息
     * @param session 会话
     */
    @OnMessage
    public void onMessage(String message, Session session)
    {
        try {
            logger.info("来自客户端消息：" + message+"客户端的id是："+session.getId());

            System.out.println("------------  :"+message);

            JSONObject jsonObject = JSON.parseObject(message);
            String textMessage = jsonObject.getString("message");
            String fromuserId = jsonObject.getString("userId");
            String touserId = jsonObject.getString("to");
            //如果不是发给所有，那么就发给某一个人
            //messageType 1代表上线 2代表下线 3代表在线名单  4代表普通消息
            Map<String,Object> map1 = Maps.newHashMap();
            map1.put("messageType",4);
            map1.put("textMessage",textMessage);
            map1.put("fromuserId",fromuserId);
            if(touserId.equals("All")){
                map1.put("touserId","所有人");
                sendMessageAll(JSON.toJSONString(map1),fromuserId);
            }
            else{
                map1.put("touserId",touserId);
                System.out.println("开始推送消息给"+touserId);
                sendMessageTo(JSON.toJSONString(map1),touserId);
            }
        }
        catch (Exception e){

            e.printStackTrace();
            logger.info("发生了错误了");
        }

    }


    public void sendMessageTo(String message, String TouserId) throws IOException {
        for (WebSocket item : clients.values()) {
            //    System.out.println("在线人员名单  ："+item.userId.toString());
            if (item.userId.equals(TouserId) ) {
                item.session.getAsyncRemote().sendText(message);
                break;
            }
        }
    }

    public void sendMessageAll(String message,String FromuserId) throws IOException {
        for (WebSocket item : clients.values()) {
            item.session.getAsyncRemote().sendText(message);
        }
    }

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

}

配置类

package com.demo.config;

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

/**
 * 开启WebSocket支持
 * @author zhengkai.blog.csdn.net
 */
@Configuration
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

}

前端代码

<!DOCTYPE HTML>
<html>
<head>
    <title>Test My WebSocket</title>
</head>
 
 
<body>
TestWebSocket
<input  id="text" type="text" />
<button onclick="send()">SEND MESSAGE</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){
        //连接WebSocket节点
        websocket = new WebSocket("ws://localhost:8071/connectWebSocket/002");
    }
    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>