@Controller
public class FileUploadController {

    @RequestMapping(value="/upload", method=RequestMethod.POST)
    public @ResponseBody String handleFileUpload(@RequestParam("file") MultipartFile file){

        if (!file.isEmpty()) {
            try {

                String originalFileName=file.getOriginalFilename();
                String fileExtension= originalFileName.substring(originalFileName.lastIndexOf("."));
                UUID uuid = UUID.randomUUID();
                String name=uuid.toString()+fileExtension;
                byte[] bytes = file.getBytes();
                BufferedOutputStream stream =
                        new BufferedOutputStream(new FileOutputStream(new File(name)));
                stream.write(bytes);
                stream.close();
                return name;

            } catch (Exception e) {
                return "You failed to upload " + file.getOriginalFilename() + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload file, because the file was empty.";
        }
    }

}