angularjs and spring mvc - upload multiple files in one request - angularjs

Question

I want to implement file uploading in my web application, I am using angular.js on client side and spring mvc on server side.
I managed to get single file upload and multiple file upload working by using https://github.com/danialfarid/angular-file-upload. The thing is, when I upload multiple files each one of them is coming to me as separate request (which is obvious event after reading example code):
//inject angular file upload directives and service.
angular.module('myApp', ['angularFileUpload']);
var MyCtrl = [ '$scope', '$upload', function($scope, $upload) {
$scope.onFileSelect = function($files) {
//$files: an array of files selected, each file has name, size, and type.
for (var i = 0; i < $files.length; i++) {
var $file = $files[i];
$scope.upload = $upload.upload({
url: 'server/upload/url', //upload.php script, node.js route, or servlet url
// method: POST or PUT,
// headers: {'headerKey': 'headerValue'}, withCredential: true,
data: {myObj: $scope.myModelObj},
file: $file,
//(optional) set 'Content-Desposition' formData name for file
//fileFormDataName: myFile,
progress: function(evt) {
console.log('percent: ' + parseInt(100.0 * evt.loaded / evt.total));
}
}).success(function(data, status, headers, config) {
// file is uploaded successfully
console.log(data);
})
//.error(...).then(...);
}
}
}];
there is an iteration through all the files.
Now I am wondering if it is possible to somehow upload multiple files as one, single request.

Answer 1

on spring controller side create
#RequestMapping(value = "/upload", method = RequestMethod.POST)
public String save(#ModelAttribute("filesForm") FileUploadForm filesForm) {
List<MultipartFile> files = filesForm.getFiles();
//do something
}
public class FileUploadForm
{
private List<MultipartFile> files;
// geters and setters ...
}
on client side upload service
return {
send: function(files) {
var data = new FormData(),
xhr = new XMLHttpRequest();
xhr.onloadstart = function() {
console.log('Factory: upload started: ', file.name);
$rootScope.$emit('upload:loadstart', xhr);
};
xhr.onerror = function(e) {
$rootScope.$emit('upload:error', e);
};
xhr.onreadystatechange = function(e)
{
if (xhr.readyState === 4 && xhr.status === 201)
{
$rootScope.$emit('upload:succes',e, xhr, file.name ,file.type);
}
};
angular.forEach(files, function(f) {
data.append('files', f, f.name);
});
xhr.open('POST', '../upload');
xhr.send(data);
}
};