[网络协议]Java websocket 多人多聊天室， 一对一聊天

1. jar包导入

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

2.JAVA代码编写

1. 一对一

package com.youying.websocket;

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

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author yao_bing
 * @Date 2022/3/8
 */
@Component
@ServerEndpoint(value="/websocketServer/{userId}")
public class WebsocketService {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    private static Map<String,WebsocketService> userMap = new ConcurrentHashMap<>();
    private Session session;
    private String userId;

    @OnOpen
    public void onOpen(Session session , @PathParam("roomId") String roomId , @PathParam("userId") String userId) {
        logger.info("现在来连接的客户id："+session.getId()+"用户名："+userId);
        this.session = session;
        this.userId = userId;
        userMap.put(userId,this);
    }

    @OnClose
    public void onClose(@PathParam("userId") String userId) {
    	if (userMap.containsKey(userId)) {
    		userMap.remove(userId);
		}
    }

    @OnMessage
    public void onMessage(String message , @PathParam("userId") String userId) {
        sendMessageTo(message,userId);
    }

    /**
     * 私聊
     * @param message 消息
     * @param toUserId 接收人
     */
    public void sendUserTo(String message , String toUserId) {
        if (userMap.containsKey(toUserId)) {
            userMap.get(toUserId).session.getAsyncRemote().sendText(message);
        }
    }
}

1. 一对多

package com.youying.websocket;

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

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author yao_bing
 * @Date 2022/3/8
 */
@Component
@ServerEndpoint(value="/websocketServer/{userId}")
public class WebsocketService {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    private static Map<String,Set<WebsocketService>> userMap = new ConcurrentHashMap<>();
    private Session session;
    private String userId;

    @OnOpen
    public void onOpen(Session session , @PathParam("userId") String userId) {
        logger.info("现在来连接的客户id："+session.getId()+"用户名："+userId);
        this.session = session;
        this.userId = userId;
        if (!userMap .containsKey("001")) {
            Set<WebsocketService> user = new HashSet();
            user.add(this);
            userMap.put("001",user);
        } else {
        	userMap.get("001").add(this);
        }
    }

    @OnClose
    public void onClose(@PathParam("userId") String userId) {
    	if (userMap.containsKey("001")) {
            for (WebsocketTest item : roomMap.get("001")) {
                if (item.userId.equals(userId)) {
                    userMap.get("001").remove(item);
                }
            }
        }
    }

    @OnMessage
    public void onMessage(String message , @PathParam("userId") String userId) {
        sendMessageTo(message,userId);
    }

    /**
     * 群发
     * @param message 消息
     * @param toUserId 发送人
     */
    public void sendUserTo(String message , String toUserId) {
      if (userMap.containsKey("001")) {
            for (WebsocketTest item : roomMap.get("001")) {
                if (!item.userId.equals(toUserId)) {
                    item.session.getAsyncRemote().sendText(message);
                }
            }
        }
    }

多对多

package com.youying.websocket;

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

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author yao_bing
 * @Date 2022/3/8
 * 多聊天室 多人聊天
 */
@Component
@ServerEndpoint(value="/websocketServer/{roomId}/{userId}")
public class WebsocketService {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    private static Map<String,WebsocketService> userMap = new ConcurrentHashMap<>();
    private static Map<String,Set<WebsocketService>> roomMap = new ConcurrentHashMap<>();
    private Session session;
    private String userId;

    @OnOpen
    public void onOpen(Session session , @PathParam("roomId") String roomId , @PathParam("userId") String userId) {
        logger.info("现在来连接的客户id："+session.getId()+"用户名："+userId);
        this.session = session;
        this.userId = userId;
        userMap.put(userId,this);
        if (!roomMap.containsKey(roomId)) {
            Set<WebsocketService> set = new HashSet<>();
            set.add(userMap.get(userId));
            roomMap.put(roomId,set);
        } else {
            roomMap.get(roomId).add(this);
        }
    }

    @OnClose
    public void onClose(@PathParam("userId") String userId , @PathParam("roomId") String roomId) {
        if (roomMap.containsKey(roomId)) {
            Set<WebsocketService> set = roomMap.get(roomId);
            for (WebsocketService item : set) {
                if (item.userId.equals(userId)) {
                    set.remove(item);
                }
            }
        }
    }

    @OnMessage
    public void onMessage(String message , @PathParam("roomId") String roomId , @PathParam("userId") String userId) {
        sendMessageTo(message,roomId,userId);
    }

    /**
     * 群聊
     * @param message 消息
     * @param roomId 房间号
     * @param userId 发送人
     */
    public void sendMessageTo(String message , String roomId , String userId) {
        if (roomMap.containsKey(roomId)) {
            for (WebsocketService item : roomMap.get(roomId)) {
                if (!item.userId.equals(userId)) {
                    item.session.getAsyncRemote().sendText(message);
                }
            }
        }
    }

    /**
     * 私聊
     * @param message 消息
     * @param toUserId 接收人
     */
    public void sendUserTo(String message , String toUserId) {
        if (userMap.containsKey(toUserId)) {
            userMap.get(toUserId).session.getAsyncRemote().sendText(message);
        }
    }
}

前端测试页面

<!DOCTYPE HTML>
<html>
<head>
    <title>Test My WebSocket2</title>
</head>
 
<body>
<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  路径和端口对应上 数据对应上 没有用数据库 用户随便填写
       websocket = new WebSocket("ws://localhost:1216/websocketServer/001/002");
    }
    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>

接口测试

package com.youying.controller;

import com.youying.websocket.WebsocketService;
import com.youying.websocket.WebsocketTest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;

/**
 * @Author yao_bing
 * @Date 2022/3/7
 */
@RestController
public class WebsocketController {
    @Autowired
    private WebsocketService websocketService;

    @ResponseBody
    @GetMapping("/sendOne")
    public String sendOne(@RequestParam("message") String message ,
                          @RequestParam("toUserId") String toUserId) {
        websocketService.sendUserTo(message, toUserId);
        return "推送成功";
    }
    
	@ResponseBody
    @GetMapping("/sendUserTo")
    public String sendUserTo(@RequestParam("message") String message ,
                            @RequestParam("userId") String userId) {
        websocketService.sendUserTo(message,userId);
        return "推送成功";
    }

	@ResponseBody
    @GetMapping("/sendMessageTo")
    public String sendMessageTo(@RequestParam("message") String message ,
                            @RequestParam("roomId") String roomId ,
                            @RequestParam("userId") String userId) {
        websocketService.sendMessageTo(message, roomId, userId);
        return "推送成功";
    }
}

最好从一对一演变到多对多，其中就是存储的类型的变化，多对多就需要多一个存储变量。