node.js--static file Request module

"Implementing a static Resource management module"

/** *static_module.js */var base_dir = __dirname,//absolute path CONF = Base_dir + '/conf/',//conf file path static = BAS  E_dir + '/static ',//static file path mmieconf;　　Used to store the Mmie json//file and its associated mmie type stored in Mmie_type.json, read this jsonvar getmmieconf = function () {var conf = {};　　try{var confstr = fs.readfilesync (CONF + ' mmie_type.json ', ' UTF8 ');//synchronous Read File CONF = Json.parse (CONFSTR);　　}catch{util.debug (' JSON parse fails '); } return conf;}; var util = require (' util '), FS = require (' FS '), HTTP = require (' http '), url = require (' URL '), Path = require (' Path '); mmieconf = getmmieconf ();//Get Static file interface//pathname: Static file relative path Req:requset Object Res:response Object exports.getstaticfile =  function (pathname, req, res) {var extname = path.extname (pathname); The path module's Extname method can get the file suffix of the URL, such as '. html ' extname = extname? Extname.slice (1): ";　　' html ' var realpath = STATIC + pathname; var mmietype = Mmieconf[extname] | |　　　　' Text/plain '; Fs.exists (Realpath, function (exsit) {//Determine if the file exists if (!exsit {//If not present, return 404 Res.writehead (404, {' Content-type ': ' Text/plain '});　　　　　　Res.write (' The file in ' + pathname + ' is not found ');　　　　Res.end (); }else{//If the file exists, determine if the file conforms to the cache condition, return 304 if compliant, non-compliant read the static file return var FileInfo = Fs.statsync (Realpath);　　　　　　Fs.statsync gets the file-related information, returns a JSON, where the Mtime property records the last modified time of the file var lastmodifiedtime = fileInfo.mtime.toUTCString ();　　　　　　　　Sets the cache-related header if (Mmieconf[extname]) {var date = new Date ();　　　　　　Res.setheader (' Expires ', date.toutcstring ());//Set Expiration Time Res.setheader (' Cache-control ', ' max-age= ' + 60*60*24*365); }//Decide whether to expire, if not expired on 304, has expired to read the file if (req.headers[' if-modified-since ') && lastmodifiedtime = req.header[' If-modified-since ']) {The header in the//req object has the last modified time of the record file, if and the last modified time of the service//device　　　　　　　　To the documentation has not been changed, 304 is good res.writehead (304, ' not modified ');　　　　　　Res.end (); }else{//read static file Fs.readfile (Realpath, ' binary ', function (err, file) {if (err) {//Read file error(Res.writehead, ' content-type:plain ');　　　　　　　　　　Res.end (ERR);　　　　　　　　　　　　}else{res.setheader (' last-modified ', lastmodifiedtime);　　　　　　　　　　　　Res.writehead (' $ ', {' Content-type ': Mmietype});　　　　　　　　　　　　Res.write (file, ' binary ');　　　　　　　　　　Res.end (); }　　　　　　　　})　　　　　　}　　　　}　　});}

　　

Use this module:

var staticmodule = require ('./static_module '); Http.createserver (function (res, req) {    var pathname = Url.parse ( Req.url). pathname;//Gets the relative path    if (pathname = = '/favicon.ico ') {        return;    } else if (pathname = = '/index ' | | pathname = = '/') {        gotoindex ();    } else{        staticmodule.getstaticfile (pathname, req, res);    });                

　　

　　

node.js--static file Request module