socket实现java聊天室，公告等功能，前后端分离（附源码）

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最新推荐文章于 2025-06-18 09:53:09 发布

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分类专栏： java 文章标签： socket java 网页聊天室公告推送

本文链接：https://blog.youkuaiyun.com/qq_39187822/article/details/99583455

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本文介绍如何使用Spring Boot实现WebSocket，包括pom依赖配置、端口设置、代码实现及页面交互，实现用户间的消息推送与广播。

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pom文件

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

application.yml中端口设置

server:
  port: 11112

下面是代码

package com.websocket.demo.websocket;

import org.junit.jupiter.api.Test;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;

import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author lzy
 * @Date 2019/8/14 9:44
 * @Version 1.0
 * @name 创建处理器
 */
public class WebSocketPushHandler extends TextWebSocketHandler {
    private static final List<WebSocketSession> USER_LIST = new ArrayList<>();

    /**
     * 用户进入系统监听
     */
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("3.用户进入系统。。。");
        System.out.println("用户信息:" + session.getAttributes());
        Map<String, Object> map = session.getAttributes();
        for (String key : map.keySet()) {
            System.out.println("key:" + key + " and value:" + map.get(key));
        }
        USER_LIST.add(session);
    }

    /**
     * 处理用户请求
     */
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        System.out.println("系统处理xxx用户的请求信息。。。");
        System.out.println("===>>> 当前系统用户数为:"+USER_LIST.size());
        System.out.println("用户所发送消息为："+message.getPayload() );
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("----------------"+ LocalTime.now() +"----------------");
        stringBuilder.append("<h3>当前系统在线用户数为:"+USER_LIST.size()+"</h3><br/><br/>");
        stringBuilder.append("<h4>用户"+session.getAttributes().get("userId")+"：</h4><br/>");
        stringBuilder.append("<h5>"+message.getPayload()+"</h5><br/>");
        TextMessage textMessage = new TextMessage(stringBuilder.toString());
        //向所有用户广播消息
        sendMessagesToUsers(textMessage);
    }

    /**
     * 用户退出后的处理
     */
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        if (session.isOpen()) {
            session.close();
        }
        System.out.println("===>>> 退出系统时用户数为:"+USER_LIST.size());
        USER_LIST.remove(session);
        System.out.println(session.getAttributes().get("userId")+"xxx用户退出系统。。。");
    }

    /**
     * 自定义函数
     * 给所有的在线用户发送消息
     */
    public static  void sendMessagesToUsers(TextMessage message) {
        for (WebSocketSession user : USER_LIST) {
            try {
                // isOpen()在线就发送
                if (user.isOpen()) {
                    StringBuilder stringBuilder = new StringBuilder();
                    stringBuilder
                            .append("######################################## <br/>")
                            .append("&nbsp;&nbsp;&nbsp;&nbsp;").append(LocalDateTime.now()).append("<br/>")
                            .append("[用户] <br/>")
                            .append(message.getPayload()).append("<br/>")
                            .append("######################################## <br/>");
                    TextMessage textMessage = new TextMessage(stringBuilder);
                    user.sendMessage(textMessage);
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println(e.getLocalizedMessage());
            }
        }
    }

    /**
     * 自定义函数
     * 发送消息给指定的在线用户
     */
    public static void sendMessageToUser(String userId, TextMessage message) {
        for (WebSocketSession user : USER_LIST) {
            if (user.getAttributes().get("userId").equals(userId)) {
                try {
                    // isOpen()在线就发送
                    if (user.isOpen()) {
                        StringBuilder stringBuilder = new StringBuilder();
                        stringBuilder
                                .append("######################################## <br/>")
                                .append("&nbsp;&nbsp;&nbsp;&nbsp;").append(LocalDateTime.now()).append("<br/>")
                                .append("[用户] <br/>")
                                .append(message.getPayload()).append("<br/>")
                                .append("######################################## <br/>");
                        TextMessage textMessage = new TextMessage(stringBuilder);
                        user.sendMessage(textMessage);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println(e.getLocalizedMessage());
                }
            }
        }
    }

    @Test
    public void Test(List<WebSocketSession> USER_LIST){
        for (WebSocketSession user : USER_LIST) {
            System.out.println(user);
        }
    }

}

package com.websocket.demo.websocket;

import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;

import java.util.Map;

/**
 * @author lzy
 * @Date 2019/8/14 9:41
 * @Version 1.0
 * @name 创建握手 此类用来获取登录用户信息并交由websocket管理
 * @Description HandshakeInterceptor WebSocket握手请求的拦截器. 检查握手请求和响应, 对WebSocketHandler传递属性
 */
public class MyWebSocketInterceptor implements HandshakeInterceptor {

    /**
     * 在握手之前执行该方法, 继续握手返回true, 中断握手返回false. 通过attributes参数设置WebSocketSession的属性
     */
    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        System.out.println("1.用户建立连接。。。");
        if (request instanceof ServletServerHttpRequest) {
            String userId = ((ServletServerHttpRequest) request).getServletRequest().getParameter("userId");
            attributes.put("userId", userId);
            System.out.println("用户唯一标识:" + userId);
        }
        return true;
    }

    /**
     * 在握手之后执行该方法. 无论是否握手成功都指明了响应状态码和相应头.
     */
    @Override
    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,Exception exception) {
        System.out.println("2.在握手之后执行该方法. 无论是否握手成功都指明了响应状态码和相应头");
    }
}

package com.websocket.demo.config;

import com.websocket.demo.websocket.MyWebSocketInterceptor;
import com.websocket.demo.websocket.WebSocketPushHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
import org.springframework.web.socket.server.HandshakeInterceptor;

/**
 * @author lzy
 * @Date 2019/8/14 9:47
 * @Version 1.0
 * @name websocket配置类
 */
@Configuration
@EnableWebSocket
public class WebSocketConfig  implements WebSocketConfigurer {
    /**
     * 注册WebSocket处理类
     */
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        System.out.println("注册WebSocket处理类");
        registry.addHandler(createWebSocketPushHandler(), "/webSocketServer")
                .addInterceptors(createHhandshakeInterceptor()).setAllowedOrigins("*");
        registry.addHandler(createWebSocketPushHandler(), "/sockjs/webSocketServer")
                .addInterceptors(createHhandshakeInterceptor()).withSockJS();
    }

    /**
     *
     * @Title: createHhandshakeInterceptor
     * @Description: 握手拦截器
     * @return
     */
    @Bean
    public HandshakeInterceptor createHhandshakeInterceptor() {
        System.out.println("握手拦截器");
        return new MyWebSocketInterceptor();
    }

    /**
     *
     * @Title: createWebSocketPushHandler
     * @Description: 处理类
     * @return
     */
    @Bean
    public WebSocketHandler createWebSocketPushHandler() {
        System.out.println("处理类");
        return new WebSocketPushHandler();
    }
}

package com.websocket.demo.controller;

import com.websocket.demo.websocket.WebSocketPushHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;

/**
 * @author lzy
 * @Date 2019/8/14 14:51
 * @Version 1.0
 * @name
 */
@RestController
@RequestMapping("/msg")
public class MsgController {

    /**
     * 功能描述:向全体广播消息
     * @param: [msg] 消息内容
     * @return: boolean
     * @auther: lzy
     * @date: 2019/8/14 16:10
     */
    @PostMapping("/sendMsg")
    public boolean sendMsg(String msg){
        System.out.println("全体广播消息 ["+msg+"]");
        TextMessage textMessage = new TextMessage(msg);
        try{
            WebSocketPushHandler.sendMessagesToUsers(textMessage);
        }catch (Exception e){
            return false;
        }
        return true;
    }

    /**
     * 功能描述:向指定用户发送消息
     * @param msg 消息内容
     * @param userId 用户编号
     * @return: boolean
     * @auther: lzy
     * @date: 2019/8/14 16:13
     */
    @PostMapping("/sendMsgByUser")
    public boolean sendMsgByUser(String msg,String userId){
        System.out.println("向 "+userId+" 发送消息，消息内容为:"+msg);
        TextMessage textMessage = new TextMessage(msg);
        try{
            WebSocketPushHandler.sendMessageToUser(userId,textMessage);
        }catch (Exception e){
            return false;
        }
        return true;
    }
}

页面代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Java后端WebSocket的Tomcat实现</title>
</head>
<body>
Welcome<br/><label for="text"></label><input id="text" type="text"/>
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>
</body>

<script type="text/javascript">
    let websocket = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:11112/webSocketServer?userId=user1"+new Date().getTime());
    }
    else {
        alert('当前浏览器不支持websocket')
    }

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

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

    //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("WebSocket连接关闭");
    };

    //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 () {
        closeWebSocket();
    };

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

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

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

源码下载链接：https://download.youkuaiyun.com/download/qq_39187822/11546600