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-demochatapp-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
{{roomID}}
昵称:
房间: {{roomID}}
当前在线人数: {{users.length}}
在线用户: {{users}}
按Enter键发送
新增 chatapp/public/index.html
demo
欢迎您,骚年
运行效果
代码已放在github https://github.com/wuyanxin/chatapp-demo.git
参考：
http://socket.io/docs/rooms-and-namespaces/
http://blog.fens.me/nodejs-socketio-chat/
http://www.jianshu.com/p/d9b1273a93fd