基于socket.io+express实现多房间聊天_node.js

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leave
io.on('connection', function(socket){
 socket.join('some room');
 // socket.leave('some room');
});

// say to room
io.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 page
router.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

 昵称:  

 房间: {{roomID}} 

 当前在线人数: {{users.length}} 

 在线用户: 
{{users}}

 
 

 按Enter键发送
 退出房间

 

'; $('#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 = '

' + sysMsg + '

'; $('#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('

'+msg+'

'); } else { $(this).text('退出房间'); socket.emit('join', userName); } }); });