javascript - How to send big files using ajax? -


so i'm working on simple project users gets upload image server. before mention problem here how i'm doing it:

client:

var dataurl = sendingcanvas.todataurl("image/*"); var imagedatatosend = dataurl.replace(/^data:image\/(png|jpg);base64,/, ""); formdata = {     'image': imagedatatosend };  $.ajax({     url: '../receive',     type: 'post',     data: formdata,     encode: false,     success: function(result){          alert(result);     } });

fyi: imagedatatosend size lower 5mb , contains file data selected.

basically happens users select image using <input type="file" tag i'm setting selected file drawn in canvas convert base64 , send server.

java server:

string datareceived = request.getreader().lines().collect(collectors.joining(system.lineseparator()));  byte[] bimg = base64.decodebase64(datareceived.getbytes("utf-8")); fileoutputstream fos = new fileoutputstream("hi.jpg"); fos.write(bimg); fos.close();

i think might not need explain code above does. i'm facing serious performance problem mean takes huge time write data hi.jpg file, if try system.out.println(datareceived); takes seconds mouse click respond on server console.

i don't know why happening, need send image data multipart or what?

all replies appreciated , in advance:)

use xmlhttprequest , formdata append file. sent using multipart , chunked appropriately.

see: https://developer.mozilla.org/en-us/docs/web/api/formdata/using_formdata_objects


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