Nodejs implements file _ node. js for simulating form upload

Use nodejs to simulate form file upload. Multiple files can be uploaded at the same time. In the past, there was a problem with the customer in the project. My colleague said that this method has never been used. SO, it took a day to figure out this method (I think it takes a little longer) and share it with me.

Code and test cases:

Var http = require ('http'); var path = require ('path'); var fs = require ('fs'); function postFile (fileKeyValue, req) {var boundaryKey = Math. random (). toString (16); var enddata = '\ r \ n ----' + boundaryKey + '--'; var files = new Array (); for (var I = 0; I <fileKeyValue. length; I ++) {var content = "\ r \ n ----" + boundaryKey + "\ r \ n" + "Content-Type: application/octet-stream \ r \ n "+" Content-Disposition: Form-data; name = \ "" + fileKeyValue [I]. urlKey + "\"; filename = \ "" + path. basename (fileKeyValue [I]. urlValue) + "\" \ r \ n "+" Content-Transfer-Encoding: binary \ r \ n "; var contentBinary = new Buffer (content, 'utf-8'); // Chinese characters are garbled when the encoding is ascii. Files. push ({contentBinary: contentBinary, filePath: fileKeyValue [I]. urlValue});} var contentLength = 0; for (var I = 0; I <files. length; I ++) {var stat = fs. statSync (files [I]. filePath); contentLength + = files [I]. contentBinary. length; contentLength + = stat. size;} req. setHeader ('content-type', 'multipart/form-data; boundary = -- '+ boundaryKey); req. setHeader ('content-length', contentLength + Buffer. byteLength (enddata); // send the parameter var fileindex = 0; var doOneFile = function () {req. write (files [fileindex]. contentBinary); var fileStream = fs. createReadStream (files [fileindex]. filePath, {bufferSize: 4*1024}); fileStream. pipe (req, {end: false}); fileStream. on ('end', function () {fileindex ++; if (fileindex = files. length) {req. end (enddata) ;}else {doOneFile () ;}}; if (fileindex = files. length) {req. end (enddata) ;}else {doOneFile () ;}// test case // http://nodejs.org/api/http.html#http_http_request_options_callbackvar Files = [{urlKey: "file1", urlValue: "E :\\ DFBF.jpg" },{ urlKey: "file2", urlValue: "E :\\ 1.jpg "}, {urlKey: "file3", urlValue: "E: \ Pro space Chinese character"}] var options = {host: "localhost", port: "8908", method: "POST", path: "/Home/Upload"} var req = http. request (options, function (res) {console. log ("RES:" + res); console. log ('status: '+ res. statusCode); console. log ('headers: '+ JSON. stringify (res. headers); // res. setEncoding ("utf8"); res. on ("data", function (chunk) {console. log ("BODY:" + chunk) ;})) req. on ('error', function (e) {console. log ('problem with request: '+ e. message); console. log (e) ;}) postFile (files, req); console. log ("done ");

In the server test, mvc is used to write an upload method in the home controller, and upload files are traversed and saved on the hard disk.

It is only possible to upload large files. It is estimated that the server must be configured for the moment.

Server method (written under the Home Controller)

[HttpPost] public string Upload () {// HttpPostedFileBase file = this. request. files ["file"]; // file. saveAs (file. fileName); foreach (string file in this. request. files) {this. request. files [file]. saveAs (@ "E: \ New Folder \" + this. request. files [file]. fileName);} return @ "saved successfully path: E: \ New Folder \";}

Run the script:

node nodejsPostFile.js

Running result: