Tukukkk

i've been trying to understand how the multipartfile works in spring
but did't find out any helpful info on internet.

Trying to understand this method:

 public String copyUploadedImage(MultipartFile multipartFile, String realpath, int userId) throws IOException {

        String orgFileName = null;

        orgFileName = multipartFile.getOriginalFilename();

        String fileName = null;

        InputStream inputStream = null;

        OutputStream outputStream = null;

        if (multipartFile.getSize() > 0) {

            inputStream = multipartFile.getInputStream();

            String root = realpath + File.separator + userId + File.separator + "Image" + File.separator;

            File file = new File(root + File.separator);

            if (file.mkdirs()) {

                System.out.println("Directory is created!");

            } else {

                System.out.println("Failed to create directory!");

            }

            fileName = file + File.separator + multipartFile.getOriginalFilename();

            outputStream = new FileOutputStream(fileName);

            int readBytes = 0;

            byte buffer = new byte[10000];

            while ((readBytes = inputStream.read(buffer, 0, 10000)) != -1) {



                outputStream.write(buffer, 0, readBytes);

            }

            outputStream.flush();

            outputStream.close();

            inputStream.close();

        }

        return orgFileName;

    }