springboot快速搭建websocket聊天室

1、新建springboot工程,启动器只选web
2、在pom.xml导入

<!--websocket-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-websocket</artifactId>
		</dependency>
		<!--Json数据转换-->
		<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.70</version>
        </dependency>
     <!-- https://mvnrepository.com/artifact/com.google.collect/com.google.collect 工具包 -->
  <dependency>
            <groupId>com.google.collect</groupId>
            <artifactId>com.springsource.com.google.common.collect</artifactId>
            <version>0.8.0.20080820</version>
        </dependency>

3、application.properties

#只配置端口8088,端口随意
server.port=8088

4、创建节点配置类WebSocketStompConfig.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
 
 
@Configuration
public class WebSocketStompConfig {
    //这个bean的注册,用于扫描带有@ServerEndpoint的注解成为websocket  ,如果你使用外置的tomcat就不需要该配置文件
    @Bean
    public ServerEndpointExporter serverEndpointExporter()
    {
        return new ServerEndpointExporter();
    }
}

5、WebSocket配置类

package com.ahhc.chat_room.utils;

/**
 * @author orange
 * @create 2020-07-07 16:40
 */

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

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;
/**
 * @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);
            //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);
    }

    /**
     * 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;
    }

}

6、创建html页面

<!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:8083/connectWebSocket/001");
    }
    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>

7、导入页面二模拟用户2
8、测试

package com.ahhc.chat_room.controller;

import com.ahhc.chat_room.utils.WebSocket;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;

/**
 * @author orange
 * @create 2020-07-07 16:57
 */
@RestController
@RequestMapping("/ws")
public class WebsSocketController {
    @Autowired
    WebSocket webSocket;

    /*单独发送根据id*/
    @ResponseBody
    @GetMapping("/sendTo")
    public String sendTo(@RequestParam("userId") String userId,@RequestParam("msg") String msg) throws IOException {

        webSocket.sendMessageTo(msg,userId);

        return "推送成功";
    }

    /**
     * 发消息给所有人
     * @param msg
     * @return
     * @throws IOException
     */
    @ResponseBody
    @GetMapping("/sendAll")
    public String sendAll(@RequestParam("msg") String msg) throws IOException {

        String fromUserId="system";//其实没用上
        webSocket.sendMessageAll(msg,fromUserId);

        return "推送成功";
    }


}

9、测试数据

{
    "message" :" hello,我是001,我想和你做朋友",
    "userId":"001",
    "to":"002"
}

引自:添加链接描述