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
<!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
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
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