Use node to build a simple Web server (ii) file upload

After installing node, open the folder where node is located, have a Node_modules folder, open the Node_modules folder, you can see a NPM folder and formidable this folder. If not, the node-formidable module is not installed. (node-formidable module is an external module developed by Felix Geisendörfer)

To install the node-formidable module:

CMD input->> npm install formidable

Installation succeeded:

Success: [email protected].  0.9
NPM OK


1.server.js

//end-of-service ———— simple servervarHTTP = require ("http");//in node, you can use the Require () function to load a module.varurl = require ("url");//Load URL ModulefunctionStart (route, handler) {functiononrequest (Request, response) {varpathname = Url.parse (request.url). Pathname;//Get URL address            //handler, methods of executionRoute (pathname, Handler, response,request);//Here the request is also passed to the route ...} http.createserver (ONrequest). Listen (8888); Console.log ("Server has Started ...");} Exports.start= start;//start is a method that invokes the

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2.route.js

function Route (pathname, Handler, response,request) {    // matches the user's input URL, is not a method function, is the method to return the method, Error not Found 404    if (typeof Handler[pathname] = = "function") {        return< /c10> Handler[pathname] (response, request);     Else {        response.writehead ($, {"Content-type": "Text/plain" });        Response.Write ("Not Found 404 ..." );        Response.End ();     = route;

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3.index.js

varServer = require ("./server");//./server get the Server.js file in the Node.exe same level directoryvarRouter = require ("./route");//Get route.js filevarRequesthandlers = require ("./handler");//Get handler.js filevarHandle = {};//make routing rules, enter/start in the URL to return the Start method in Handler.js!!!handle["/start"] =requesthandlers.start;handle["/upload"] =requesthandlers.upload;handle["/show"] = requesthandlers.show;//Add the Show method to displayServer.start (Router.route,handle); //main entrance ...

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4.handler.js

/*method called in the route (node. JS does not cache the data)*//*querying a database, or a large number of calculations, can contain blocking operations. The image says, "It's blocking all the other processing work." A new node. JS module was introduced, Child_process. It is used to achieve a simple and practical non-blocking operation: EXEC (). */varexec = require ("Child_process"). exec;varQuerystrnig = require ("querystring");//querystring module, processing post datavarFS = require ("FS");//in the FS module, NODEJS provides both asynchronous and synchronous read and write methodsvarFormidable = require ("formidable");//node-formidable module. functionStart (response) {Console.log ("Request handler ' start ' was called."); varBODY = ' //here is a form form for an HTML pageEXEC ("Ls-lah",function(Error, stdout, stderr) {Response.writehead ($, {"Content-type": "Text/html" }); //BODY = stdout;Response.Write (body);    Response.End (); });}functionUpload (response, request) {Console.log ("Request handler ' upload ' was called."); varform =NewFormidable. Incomingform ();//using the methods in the Node-formidable moduleForm.uploaddir = "temp";//indicate pathform.parse (Request,function(Error, fields, files) {Console.log ("Path:" +Files.upload.path); Try        {            //Files.upload.path File            //"Temp/test.png" saves the images sent by the user to the temp directory. Test.png is the file name of the pictureFs.renamesync (Files.upload.path, "Temp/test.png"); }Catch(e) {console.log (e); } response.writehead ({"Content-type": "Text/html" }); Response.Write ("Received image:<br/>"); Response.Write ("//the URL address that src points to is: showResponse.End (); })}//executes the image file uploaded by the user. Show the pictures.functionShow (response) {Console.log ("Show was called ...."); Fs.readfile ("Temp/test.png", "binary",function(Error, file) {if(Error) {Response.writehead ({"Content-type": "Text/plain" }); Response.Write (Error+ "\ n");        Response.End (); } Else{Response.writehead ($, {"Content-type": "Image/png" }); Response.Write (File,"Binary");// binary binary binaryResponse.End (); }    });} Exports.start=Start;exports.upload=Upload;exports.show= Show;

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Cmd->node Index.js

URL Input: Http://localhost:8888/start

-->upload file Submission (you can see the picture ....) ）

Use node to build a simple Web server (ii) file upload