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在我之前讲到的node.js web 开发基本框架的前提下（），我们来做一个文件上传功能

上传的handler比较简单，网上都能找到

var url=require('url');var exec=require('child_process').exec;var querystring=require('querystring');/********************************文件上传 第3方模块测试*************************/function fileUploadForm(request,response){    response.writeHead(200,{'Content-Type':'text/html'});    var body = ''+        ''+        '
   '+        ''+        ''+        '
   
    '+        '
    '+        '
    '+        '
    '+        '
   
'+        ''+        '';    response.write(body);    response.end();}function fileUploadAction(request,response){    var fs=require('fs');    var formidable=require('formidable');    var baseUploadPath="./media/upload/";    var form=new formidable.IncomingForm();    form.uploadDir='./var/tmp';    form.parse(request,function(error,fields,files){        if(!error){            console.log(fields);            var desUploadName=baseUploadPath+files.upload.name;            fs.renameSync(files.upload.path, desUploadName);            response.writeHead(200,{'Content-Type':'text/html'});//值得注意的是这里的response.writeHead()函数内容要写在form.parse()的callback中要不不会显示            response.write('received image:
');            response.write('');            response.end();        }    });}function showUploadImage(request,response){    var fs=require('fs');    var imageName=querystring.parse(url.parse(request.url).query);    var baseUploadPath="./media/upload/";    fs.readFile(baseUploadPath+imageName.name, "binary", function(error, file) {        if(error) {            response.writeHead(500, {"Content-Type": "text/plain"});            response.write(error + "\n");            response.end();        } else {            response.writeHead(200, {"Content-Type": "image/png"});            response.write(file, "binary");            response.end();        }    });}exports.fileuploadform=fileUploadForm;exports.fileuploadaction=fileUploadAction;exports.showuploadimage=showUploadImage;

handle['/fileuploadform']=handlers.fileuploadform;handle['/fileuploadaction']=handlers.fileuploadaction;handle['/showuploadimage']=handlers.showuploadimage;

request.setEncoding('utf8');//设置这个很可能导致上传失败，这是formidable模块的一个bug吧

和

request.addListener("data",function(tempPostData){            postData+=tempPostData;        });        request.addListener("end",function(){            route(request,response,postData,handle);        });

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