基于socket.io+express实现多房间聊天

2019-11-20 10:22:55

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socket.io简介

Socket.IO是一个开源的WebSocket库，它通过Node.js实现WebSocket服务端，同时也提供客户端JS库。Socket.IO支持以事件为基础的实时双向通讯，它可以工作在任何平台、浏览器或移动设备。

Socket.IO支持4种协议：WebSocket、htmlfile、xhr-polling、jsonp-polling，它会自动根据浏览器选择适合的通讯方式，从而让开发者可以聚焦到功能的实现而不是平台的兼容性，同时Socket.IO具有不错的稳定性和性能。

多房间聊天

socket.io提供rooms和namespace的API

用rooms的API就可以实现多房间聊天了，总结出来无外乎就是：join/leave room 和 say to room

// join和leaveio.on('connection', function(socket){ socket.join('some room'); // socket.leave('some room');});// say to roomio.to('some room').emit('some event'):io.in('some room').emit('some event'):

代码 github
新建文件夹chatapp-demo
chatapp-demo/package.json

{ "name": "chatapp-demo", "version": "1.0.0", "description": "multi room chat app demo, powered by socket.io", "main": "app.js", "dependencies": {  "express": "^4.13.3",  "hbs": "^3.1.0",  "path": "^0.11.14",  "socket.io": "^1.3.6" }, "devDependencies": {}, "author": "wuyanxin", "license": "ISC"}

执行 npm install

服务端代码

增加文件 chatapp-demo/app.js

var express = require('express');var path = require('path');var IO = require('socket.io');var router = express.Router();var app = express();var server = require('http').Server(app);app.use(express.static(path.join(__dirname, 'public')));app.set('views', path.join(__dirname, 'views'));app.set('view engine', 'hbs');// 创建socket服务var socketIO = IO(server);// 房间用户名单var roomInfo = {};socketIO.on('connection', function (socket) { // 获取请求建立socket连接的url // 如: http://localhost:3000/room/room_1, roomID为room_1 var url = socket.request.headers.referer; var splited = url.split('/'); var roomID = splited[splited.length - 1];  // 获取房间ID var user = ''; socket.on('join', function (userName) {  user = userName;  // 将用户昵称加入房间名单中  if (!roomInfo[roomID]) {   roomInfo[roomID] = [];  }  roomInfo[roomID].push(user);  socket.join(roomID);  // 加入房间  // 通知房间内人员  socketIO.to(roomID).emit('sys', user + '加入了房间', roomInfo[roomID]);   console.log(user + '加入了' + roomID); }); socket.on('leave', function () {  socket.emit('disconnect'); }); socket.on('disconnect', function () {  // 从房间名单中移除  var index = roomInfo[roomID].indexOf(user);  if (index !== -1) {   roomInfo[roomID].splice(index, 1);  }  socket.leave(roomID);  // 退出房间  socketIO.to(roomID).emit('sys', user + '退出了房间', roomInfo[roomID]);  console.log(user + '退出了' + roomID); }); // 接收用户消息,发送相应的房间 socket.on('message', function (msg) {  // 验证如果用户不在房间内则不给发送  if (roomInfo[roomID].indexOf(user) === -1) {    return false;  }  socketIO.to(roomID).emit('msg', user, msg); });});// room pagerouter.get('/room/:roomID', function (req, res) { var roomID = req.params.roomID; // 渲染页面数据(见views/room.hbs) res.render('room', {  roomID: roomID,  users: roomInfo[roomID] });});app.use('/', router);server.listen(3000, function () { console.log('server listening on port 3000');});

客户端代码

新增chatapp/views/room.hbs

<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title>{{roomID}}</title> <style>  #msglog, #messageInput {   border: 1px solid #ccc;   width: 500px;   height: 350px;   overflow-y: auto;   font-size: 14px;  }  #messageInput {   height: 80px;  }  .message {   line-height: 22px;  }  .message .user {   padding-right: 5px;   padding-left: 5px;   color: brown;  }  .sysMsg {   color: #c1bfbf;   padding-right: 5px;   padding-left: 5px;   font-size: 12px;  }  #users {   width: 490px;   padding: 0 5px 5px;  } </style></head><body> 昵称: <span id="userName"></span> <br/> 房间: {{roomID}} <br/> 当前在线人数: <span id="count">{{users.length}}</span> <br/> 在线用户: <div id="users">{{users}}</div> <div id="msglog"> </div> <textarea name="message" id="messageInput"></textarea> <br/> 按Enter键发送 <button id="joinOrLeave">退出房间</button> <script src="/socket.io/socket.io.js"></script> <script src="/js/jquery.js"></script> <script>  $(function () {   // ----------设置昵称-------------   var userName = '';   while ($('#userName').text().trim() === '') {    userName = prompt("请设置你的昵称","");    $('#userName').text(userName);   }   // ---------创建连接-----------   var socket = io();   // 加入房间   socket.on('connect', function () {    socket.emit('join', userName);   });   // 监听消息   socket.on('msg', function (userName, msg) {    var message = '' +      '<div class="message">' +      ' <span class="user">' + userName + ': </span>' +      ' <span class="msg">' + msg + '</span>' +      '</div>';    $('#msglog').append(message);    // 滚动条保持最下方    $('#msglog').scrollTop($('#msglog')[0].scrollHeight);    });   // 监听系统消息   socket.on('sys', function (sysMsg, users) {    var message = '<div class="sysMsg">' + sysMsg + '</div>';    $('#msglog').append(message);    $('#count').text(users.length);    $('#users').text(users);   });   // 发送消息   $('#messageInput').keydown(function (e) {    if (e.which === 13) {     e.preventDefault();     var msg = $(this).val();     $(this).val('');     socket.send(msg);    }   });   // 退出房间   $('#joinOrLeave').click(function () {    if ($(this).text() === '退出房间') {     $(this).text('进入房间');     socket.emit('leave');     var msg = '你已经退出了房间,重新发言请点击"进入房间"';     $('#msglog').append('<div class="sysMsg">'+msg+'</div>');    } else {     $(this).text('退出房间');     socket.emit('join', userName);    }   });  }); </script></body></html>

新增 chatapp/public/index.html

<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title>demo</title></head><body> 欢迎您,骚年 <div>  <p>房间列表</p>  <ul>   <li id="room_1"><a href="/room/room_1" target="_blank">1号房间</a></li>   <li id="room_2"><a href="/room/room_2" target="_blank">2号房间</a></li>   <li id="room_3"><a href="/room/room_3" target="_blank">3号房间</a></li>   <li id="room_4"><a href="/room/room_4" target="_blank">4号房间</a></li>   <li id="room_5"><a href="/room/room_5" target="_blank">5号房间</a></li>   <li id="room_6"><a href="/room/room_6" target="_blank">6号房间</a></li>   <li id="room_7"><a href="/room/room_7" target="_blank">7号房间</a></li>   <li id="room_8"><a href="/room/room_8" target="_blank">8号房间</a></li>   <li id="room_9"><a href="/room/room_9" target="_blank">9号房间</a></li>   <li id="room_10"><a href="/room/room_10" target="_blank">10号房间</a></li>  </ul> </div></body></html>

运行效果