Empty List when trying to upload many files in Spring with ng-file-upload

Question

I have the following controller method for uploading multiple files at once, inspired by this blog post and answers to this question as well:

@RequestMapping         


        

Answer 1

The problem was that ng-file-upload by default submits array of files using names file[0], file[1] etc. It is configurable with the arrayKey value when using Upload Service. Setting it to empty string forces the files to be sent under the same file key, which is correctly resolved with Spring and the @RequestParam("file") List contains all files that has been submitted.

Upload.upload({url: url, data: {file: arrayOfFiles}, arrayKey: ''})