Example Spring MVC controller to accept file uploaded with https://gist.github.com/iampivot/6922245b057a7930e2d8

FileUpload.java

package example.controller;

import java.io.IOException;
import java.util.List;
import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class FileUploadController {

    protected static final Logger log = Logger.getLogger(FileUploadController.class);

    // Optionally add your @ModelAttribute to accept the rest of the form data, eg. 
    // 
    // public String insert(@RequestParam("files") MultipartFile [] images, @Valid @ModelAttribute("company") Company company,
    // BindingResult result, ModelMap model) {

    @RequestMapping(value = "/media/upload", method = RequestMethod.POST)
    public ResponseEntity<String> upload(@RequestParam("files") List<MultipartFile> images) {

        log.debug("uploading media");
        JSONObject jsonMaster = new JSONObject ();
        JSONArray jsonArray = new JSONArray();

        for (MultipartFile mpf: images) {
            log.debug(mpf.getOriginalFilename() + " uploaded");

            JSONObject jo = new JSONObject();
            jo.put("name", mpf.getOriginalFilename());
            jo.put("size", mpf.getSize());
            jo.put("type", mpf.getContentType());

            try {
                // create temporary file somewhere, get OutputStream
                // FileCopyUtils.copy(mpf.getBytes(), os);

            } catch (IOException e) {
                log.error("error while uploading file; ", e);
            }
            jsonArray.put(jo);
        }

        jsonMaster.put("files", jsonArray);

        return new ResponseEntity<>(jsonMaster.toString(), HttpStatus.CREATED);
    }
}