---

一、数据库搭建

很简单的一个user表，加两个用户admin和wskh

二、后端搭建

2.1 引入关键依赖

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

2.2 WebSocket配置类

WebSocketConfig的作用是：开启WebSocket监听

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;/*** @Author：WSKH* @ClassName：WebSocketConfig* @ClassType：配置类* @Description：WebSocket配置类* @Date：2022/1/25/12:21* @Email：1187560563@qq.com* @Blog：https://blog.csdn.net/weixin_51545953?type=blog*/
@Configuration
public class WebSocketConfig {/*** 开启webSocket* @return*/@Beanpublic ServerEndpointExporter serverEndpointExporter() {return new ServerEndpointExporter();}
}

WebSocketServer里写了一些事件，如发送消息事件，建立连接事件，关闭连接事件等

import com.wskh.chatroom.util.FastJsonUtils;
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.EOFException;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;@ServerEndpoint("/websocket/{sid}")
@Component
public class WebSocketServer {private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);private static int onlineCount = 0;private static ConcurrentHashMap<String,WebSocketServer> webSocketServerMap = new ConcurrentHashMap<>();private Session session;private String sid;@OnOpenpublic void onOpen(Session session, @PathParam("sid") String sid) {this.sid = sid;this.session = session;webSocketServerMap.put(sid, this);addOnlineCount();log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount());try {sendInfo("openSuccess:"+webSocketServerMap.keySet());} catch (IOException e) {e.printStackTrace();}}@OnClosepublic void onClose() {webSocketServerMap.remove(sid);subOnlineCount();log.info("有一连接关闭！当前在线人数为" + getOnlineCount());try {sendInfo("openSuccess:"+webSocketServerMap.keySet());} catch (IOException e) {e.printStackTrace();}}@OnMessagepublic void onMessage(String message) throws IOException {if("ping".equals(message)) {sendInfo(sid, "pong");}if(message.contains(":")) {String[] split = message.split(":");sendInfo(split[0], "receivedMessage:"+sid+":"+split[1]);}}@OnErrorpublic void onError(Session session, Throwable error) {if(error instanceof EOFException) {return;}if(error instanceof IOException && error.getMessage().contains("已建立的连接")) {return;}log.error("发生错误", error);}/*** 实现服务器主动推送*/public void sendMessage(String message) throws IOException {synchronized (session) {this.session.getBasicRemote().sendText(message);}}public static void sendObject(Object obj) throws IOException {sendInfo(FastJsonUtils.convertObjectToJSON(obj));}public static void sendInfo(String sid,String message) throws IOException {WebSocketServer socketServer = webSocketServerMap.get(sid);if(socketServer != null) {socketServer.sendMessage(message);}}public static void sendInfo(String message) throws IOException {for(String sid : webSocketServerMap.keySet()) {webSocketServerMap.get(sid).sendMessage(message);}}public static void sendInfoByUserId(Long userId,Object message) throws IOException {for(String sid : webSocketServerMap.keySet()) {String[] sids =  sid.split("id");if(sids.length == 2) {String id = sids[1];if(userId.equals(Long.parseLong(id))) {webSocketServerMap.get(sid).sendMessage(FastJsonUtils.convertObjectToJSON(message));}}}}public static Session getWebSocketSession(String sid) {if(webSocketServerMap.containsKey(sid)) {return webSocketServerMap.get(sid).session;}return null;}public static synchronized void addOnlineCount() {onlineCount++;}public static synchronized void subOnlineCount() {onlineCount--;}public static synchronized int getOnlineCount() {return onlineCount;}
}

2.3 配置跨域

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {@Override// 跨域配置public void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("*").allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE").maxAge(3600).allowCredentials(true);}}

2.4 发送消息的控制类

/*** @Author：WSKH* @ClassName：MsgController* @ClassType：控制类* @Description：信息控制类* @Date：2022/1/25/12:47* @Email：1187560563@qq.com* @Blog：https://blog.csdn.net/weixin_51545953?type=blog*/
@ApiModel("信息控制类")
@RestController
@RequestMapping("/chatroom/msg")
public class MsgController {@ApiOperation("发送信息方法")@PostMapping("/sendMsg")public R sendMsg(String msg) throws IOException {WebSocketServer.sendInfo(msg);return R.ok().message("发送成功");}
}

至此，后端部分大体配置完毕。

---

三、前端搭建

本文使用vue-admin-template-master模板进行聊天室的前端搭建

3.1 自定义文件websocket.js

将下面文件放在api文件夹下

//websocket.js
import Vue from 'vue'// 1、用于保存WebSocket 实例对象
export const WebSocketHandle = undefined// 2、外部根据具体登录地址实例化WebSocket 然后回传保存WebSocket
export const WebsocketINI = function(websocketinstance) {this.WebSocketHandle = websocketinstancethis.WebSocketHandle.onmessage = OnMessage
}// 3、为实例化的WebSocket绑定消息接收事件：同时用于回调外部各个vue页面绑定的消息事件
// 主要使用WebSocket.WebSocketOnMsgEvent_CallBack才能访问  this.WebSocketOnMsgEvent_CallBack 无法访问很诡异
const OnMessage = function(msg) {// 1、消息打印// console.log('收到消息：', msg)// 2、如果外部回调函数未绑定 结束操作if (!WebSocket.WebSocketOnMsgEvent_CallBack) {console.log(WebSocket.WebSocketOnMsgEvent_CallBack)return}// 3、调用外部函数WebSocket.WebSocketOnMsgEvent_CallBack(msg)
}// 4、全局存放外部页面绑定onmessage消息回调函数:注意使用的是var
export const WebSocketOnMsgEvent_CallBack = undefined// 5、外部通过此绑定方法 来传入的onmessage消息回调函数
export const WebSocketBandMsgReceivedEvent = function(receiveevent) {WebSocket.WebSocketOnMsgEvent_CallBack = receiveevent
}// 6、封装一个直接发送消息的方法：
export const Send = function(msg) {if (!this.WebSocketHandle || this.WebSocketHandle.readyState !== 1) {// 未创建连接 或者连接断开 无法发送消息return}this.WebSocketHandle.send(msg)// 发送消息
}// 7、导出配置
const WebSocket = {WebSocketHandle,WebsocketINI,WebSocketBandMsgReceivedEvent,Send,WebSocketOnMsgEvent_CallBack
}// 8、全局绑定WebSocket
Vue.prototype.$WebSocket = WebSocket

3.2 main.js中全局引入websocket

import '@/utils/websocket' // 全局引入 WebSocket 通讯组件

3.3 App.vue中声明websocket对象

App.vue

<template><div id="app"><router-view /></div>
</template><script>import {getInfo} from './api/login.js';import {getToken} from './utils/auth.js'export default {name: 'App',mounted() {// 每3秒检测一次websocket连接状态 未连接 则尝试连接 尽量保证网站启动的时候 WebSocket都能正常长连接setInterval(this.WebSocket_StatusCheck, 3000)// 绑定消息回调事件this.$WebSocket.WebSocketBandMsgReceivedEvent(this.WebSocket_OnMesage)// 初始化当前用户信息this.token = getToken()getInfo(this.token).then((rep)=>{console.log(rep)this.userName = rep.data.name}).catch((error)=>{console.log(error)})},data(){return{}},methods: {// 实际消息回调事件WebSocket_OnMesage(msg) {console.log('收到服务器消息：', msg.data)console.log(msg)let chatDiv = document.getElementById("chatDiv")let newH3 = document.createElement("div")if(msg.data.indexOf('openSuccess')>=0){// 忽略连接成功消息提示}else{if(msg.data.indexOf(this.userName)==0){// 说明是自己发的消息，应该靠右边悬浮newH3.innerHTML = "<div style='width:100%;text-align: right;'><h3 style=''>"+msg.data+"</h3></div>"}else{newH3.innerHTML = "<div style='width:100%;text-align: left;'><h3 style=''>"+msg.data+"</h3></div>"}}chatDiv.appendChild(newH3)},// 1、WebSocket连接状态检测：WebSocket_StatusCheck() {if (!this.$WebSocket.WebSocketHandle || this.$WebSocket.WebSocketHandle.readyState !== 1) {console.log('Websocket连接中断，尝试重新连接:')this.WebSocketINI()}},// 2、WebSocket初始化：async WebSocketINI() {// 1、浏览器是否支持WebSocket检测if (!('WebSocket' in window)) {console.log('您的浏览器不支持WebSocket!')return}let DEFAULT_URL = "ws://" + '127.0.0.1:8002' + '/websocket/' + new Date().getTime()// 3、创建Websocket连接const tmpWebsocket = new WebSocket(DEFAULT_URL)// 4、全局保存WebSocket操作句柄：main.js 全局引用this.$WebSocket.WebsocketINI(tmpWebsocket)// 5、WebSocket连接成功提示tmpWebsocket.onopen = function(e) {console.log('webcoket连接成功')}//6、连接失败提示tmpWebsocket.onclose = function(e) {console.log('webcoket连接关闭：', e)}}}}
</script>

3.4 聊天室界面.vue

<template><div><div style="margin-top: 1vh;margin-bottom: 1vh;font-weight: bold;">聊天内容:</div><div style="background-color: #c8c8c8;width: 100%;height: 80vh;" id="chatDiv"></div><div style="margin-top: 1vh;margin-bottom: 1vh;font-weight: bold;">聊天输入框:</div><el-input v-model="text"></el-input><el-button @click="sendMsg">点击发送</el-button></div>
</template><script>import {getInfo} from '../../api/login.js';import {getToken} from '../../utils/auth.js'import msgApi from '../../api/msg.js'export default {mounted() {//this.token = getToken()getInfo(this.token).then((rep)=>{console.log(rep)this.userName = rep.data.name}).catch((error)=>{console.log(error)})},data() {return {text: "",token:"",userName:"",}},methods: {sendMsg(){let msg = this.userName+"："+this.textmsgApi.sendMsg(msg).then((rep)=>{}).catch((error)=>{})this.text = ""}}}
</script><style scoped="true">.selfMsg{float: right;}
</style>

3.5 最终效果

用两个不同的浏览器，分别登录admin账号和wskh账号进行聊天测试，效果如下（左边为admin）：