node和express分别实现静态文件服务器

1、nodeJS版

var http=require('http');
var fs=require('fs');
var url=require('url');
var path=require('path');
var PORT=9090;
//添加MIME类型
var MIME_TYPE = {
    "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"
};

var server = http.createServer(serverStatic);
function serverStatic(req,res){
    var filePath;
    if(req.url==="/"){
        filePath =  "index.html";
    } else{
        filePath = "./" + url.parse(req.url).pathname;
    }

    fs.exists(filePath,function(err){
        if(!err){
            send404(res);
        }else{
            var ext = path.extname(filePath);
            ext = ext?ext.slice(1) : 'unknown';
            var contentType = MIME_TYPE[ext] || "text/plain";
            fs.readFile(filePath,function(err,data){
                if(err){
                    res.end("
500
服务器内部错误！");
                }else{
                    res.writeHead(200,{'content-type':contentType});
                    res.end(data.toString());
                }
            });//fs.readfile
        }
    })//path.exists

}

server.listen(PORT);
console.log("Server runing at port: " + PORT + ".");

function send404(res){
    res.end("
404
file not found
")
}

使用express框架：

var express = require("express");
var app = express();
app.use("/",express.static(__dirname + "/public"));
app.listen(3000);