/**
 * mime類型的 map
 * @ author Cheng Liufeng
 * @ date 2014/8/30
 * 當(dāng)請(qǐng)求靜態(tài)服務(wù)器文件的類型 html, css, gif, jpg, png, javascript, json, plain text, 我們會(huì)在此文件進(jìn)行映射
 */
exports.types = {
 "css": "text/css",
 "gif": "image/gif",
 "html": "text/html",
 "ico": "image/x-icon",
 "jpeg": "image/jpeg",
 "jpg": "image/jpeg",
 "js": "text/javascript",
 "json": "application/json",
 "pdf": "application/pdf",
 "png": "image/png",
 "svg": "image/svg+xml",
 "swf": "application/x-shockwave-flash",
 "tiff": "image/tiff",
 "txt": "text/plain",
 "wav": "audio/x-wav",
 "wma": "audio/x-ms-wma",
 "wmv": "video/x-ms-wmv",
 "xml": "text/xml"
};

/**
 * 聊天室服務(wù)端
 * 功能：實(shí)現(xiàn)了Node版的靜態(tài)服務(wù)器
 * 實(shí)現(xiàn)了緩存，gzip壓縮等
 * @ author Cheng Liufeng
 * @ date 2014/8/30
 */
 // 設(shè)置端口號(hào)
var PORT = 3000;
// 引入模塊
var http = require('http');
var url = require('url');
var fs = require('fs');
var path = require('path');
var zlib = require('zlib');
// 引入文件
var mime = require('./mime').types;
var config = require('./config');
var chatServer = require('./utils/chat_server');
var server = http.createServer(function (req, res) {
 res.setHeader("Server","Node/V8");
 // 獲取文件路徑
 var pathName = url.parse(req.url).pathname;
 if(pathName.slice(-1) === "/"){
 pathName = pathName + "index.html"; //默認(rèn)取當(dāng)前默認(rèn)下的index.html
 }
 // 安全處理（當(dāng)使用Linux 的 curl命令訪問時(shí)，存在安全隱患）
 var realPath = path.join("client", path.normalize(pathName.replace(/\.\./g, "")));
 // 檢查文件路徑是否存在
 path.exists(realPath, function(exists) {
 // 當(dāng)文件不存在時(shí)的情況， 輸出一個(gè)404錯(cuò)誤
 if (!exists) {
  res.writeHead(404, "Not Found", {'Content-Type': 'text/plain'});
  res.write("The request url" + pathName +" is not found!");
  res.end();
 } else {   // 當(dāng)文件存在時(shí)的處理邏輯
  fs.stat(realPath, function(err, stat) {
    // 獲取文件擴(kuò)展名
  var ext = path.extname(realPath);
  ext = ext ? ext.slice(1) : "unknown";
  var contentType = mime[ext] || "text/plain";
  // 設(shè)置 Content-Type
  res.setHeader("Content-Type", contentType);
  var lastModified = stat.mtime.toUTCString();
  var ifModifiedSince = "If-Modified-Since".toLowerCase();
  res.setHeader("Last-Modified", lastModified);
  if (ext.match(config.Expires.fileMatch)) {
   var expires = new Date();
   expires.setTime(expires.getTime() + config.Expires.maxAge * 1000);
   res.setHeader("Expires", expires.toUTCString());
   res.setHeader("Cache-Control", "max-age=" + config.Expires.maxAge);
  }
  if (req.headers[ifModifiedSince] && lastModified == req.headers[ifModifiedSince]) {
   res.writeHead(304, "Not Modified");
   res.end();
  } else {
   // 使用流的方式去讀取文件
   var raw = fs.createReadStream(realPath);
   var acceptEncoding = req.headers['accept-encoding'] || "";
   var matched = ext.match(config.Compress.match);
   if (matched && acceptEncoding.match(/\bgzip\b/)) {
   res.writeHead(200, "Ok", {'Content-Encoding': 'gzip'});
   raw.pipe(zlib.createGzip()).pipe(res);
   } else if (matched && acceptEncoding.match(/\bdeflate\b/)) {
   res.writeHead(200, "Ok", {'Content-Encoding': 'deflate'});
   raw.pipe(zlib.createDeflate()).pipe(res);
   } else {
   res.writeHead(200, "Ok");
   raw.pipe(res);
   }

//   fs.readFile(realPath, "binary", function(err, data) {
//   if(err) {
//    // file exists, but have some error while read
//    res.writeHead(500, {'Content-Type': 'text/plain'});
//    res.end(err);
//   } else {
//    // file exists, can success return
//    res.writeHead(200, {'Content-Type': contentType});
//    res.write(data, "binary");
//    res.end();
//   }
//   });
  }
  });
 }
 });
});

server.listen(PORT, function() {
 console.log("Server is listening on port " + PORT + "!");
});

chatServer.listen(server);

/**
 * 聊天服務(wù)。
 */
var socketio = require('socket.io');
var io;
var guestNumber = 1;   //初始用戶名編號(hào)
var nickNames = {};   // 昵稱列表
var namesUsed = [];   //使用過的用戶名
var currentRoom = {};   //當(dāng)前聊天室
function assignGuestName(socket, guestNumber, nickNames, namesUsed) {
 var name = 'Guest' + guestNumber;
 nickNames[socket.id] = name;
 socket.emit('nameResult', {
 success: true,
 name: name
 });
 namesUsed.push(name);
 return guestNumber + 1;
}
function joinRoom(socket, room) {
 socket.join(room);
 currentRoom[socket.id] = room;
 socket.emit('joinResult', {room: room});
 socket.broadcast.to(room).emit('message', {
 text: nickNames[socket.id] + 'has joined ' + room + '.'
 });
}
function handleMessageBroadcasting(socket) {
 socket.on('message', function(message) {
 socket.broadcast.to(message.room).emit('message', {
  text: nickNames[socket.id] + ':' + message.text
 });
 });
}
exports.listen = function(server) {
 io = socketio.listen(server);
 io.set('log level', 1);
 // 定義每個(gè)用戶的連接處理
 io.sockets.on('connection', function(socket) {
 // 分配一個(gè)用戶名
 guestNumber = assignGuestName(socket, guestNumber, nickNames, namesUsed);
 // 將用戶加入聊天室Lobby里
 joinRoom(socket, 'Lobby');
 //處理聊天信息
 handleMessageBroadcasting(socket, nickNames);
 //handleNameChangeAttempts(socket, nickNames, namesUsed);
 //handleRoomJoining(socket);
 //handleClientDisconnection(socket, nickNames, namesUsed);
 });
};

<!DOCTYPE html>
<html ng-app="chatApp">
<head>
 <meta name="viewport" content="width=device-width, user-scalable=no">
</head>
<body ng-controller="InitCtrl">
 <div ng-view></div>
 <script src="lib/angular.js"></script>
 <script src="lib/angular-route.js"></script>
 <script src="lib/socket.io.js"></script>
 <script src="app.js"></script>
 <script src="controllers/InitCtrl.js"></script>
</body>
</html>

/**
 * 客戶端（目前只支持瀏覽器，將來會(huì)擴(kuò)展到移動(dòng)端）程序入口文件
 * 創(chuàng)建一個(gè)模塊，并且命名為chatApp
 * 配置路由，實(shí)現(xiàn)單頁應(yīng)用(single page application)
 */
 var chatApp = angular.module("chatApp", ['ngRoute']);
 // 路由配置
 chatApp.config(function($routeProvider) {
 $routeProvider.when('/', {
  templateUrl : 'views/init.html',
  controller: 'InitCtrl'
 })
 .when('/init', {
  templateUrl : 'views/init.html',
  controller: 'InitCtrl'
 });
 });

/**
 * # InitCtrl
 */
angular.module('chatApp').controller('InitCtrl', function($scope) {
 var socket = io.connect('http://127.0.0.1:3000');
 socket.on('nameResult', function(result) {
 var message;
 if (result.success) {
  message = 'you are now known as ' + result.name + '.'; 
  console.log('message=', message);
  document.getElementById('guestname').innerHTML = message;
 } else {
  message = result.message;
 }
 });
 socket.on('joinResult', function(result) {
 document.getElementById('room').innerHTML = result.room;
 });
 $scope.sendMessage = function() {
 var message = {
  room: 'Lobby',
  text: document.getElementById('user_input').value
 };
 socket.emit('message', message);
 };
 socket.on('message', function(message) {
 var p = document.createElement('p');
 p.innerHTML = message.text;
 document.getElementById('message').appendChild(p);
 });
});

<script src="/socket.io/socket.io.js"></script>

<script src="http://ip:port/socket.io/socket.io.js"></script>

var io = require('socket.io').listen(80);

io.sockets.on('connection', function (socket) {
 socket.broadcast.emit('user connected');
 socket.broadcast.json.send({ a: 'message' });
});

io.sockets.emit('users_count', clients);

node main.js