简易的nodejs httpserver

httptoy.js

(function(){
    var http = require("http");
    var fs = require('fs');

    //默认启动http服务的路径
    var documentRoot = process.cwd();

    //默认文档名称
    var defaultDocument = "index.htm";

    var contentType = {
        "*"     : "application/octet-stream",
        ".ico"  : "image/x-icon",
        ".jpe"  : "image/jpeg",
        ".jpeg" : "image/jpeg",
        ".jpg"  : "image/jpeg",
        ".png"  : "image/png",
        ".html" : "text/html",
        ".htm"  : "text/html",
        ".css"  : "text/css",
        ".txt"  : "text/plain",
        ".js"   : "application/x-javascript"

    }

    var server = http.createServer(function(req,res){
        var URI = ((/\/$/.test(req.url))?(req.url + defaultDocument):req.url).split("?");
        var filename = documentRoot + URI[0];
        var queryString = URI[1] || "";
        var ext = (filename.match("\\.\\w+") || "*").toString().toLowerCase();

        fs.exists(filename, function(exists){
            if (exists) {
                fs.readFile(filename, function(err, data){
                    if (err) {
                        res.writeHead(500, {'Content-Type' : "text/html"});
                        res.end("<h1>500</h1>");
                        throw err;
                    }

                    //写头部信息
                    res.writeHead(200, {'Content-Type' : contentType[ext] || "text/plain"});
                    res.end(data);
                })
            }else{
                res.writeHead(404, {'Content-Type' : "text/html"});
                res.end("<h1>404</h1>");
            }
        });
    });

    server.listen(8080,"127.0.0.1");
})();