Android에서 웹 API로 다중 파트 양식 데이터를 게시하는 방법은 무엇입니까?

stackoverflow에 multipart에 대한 많은 게시물이 있습니다.

public static String uploadMultipartFile(String root, String token,
                         String username, String sourceFileUri,
                         String fileStyle)
{
    HttpURLConnection connection = null;
    DataOutputStream outputStream = null;
    String pathToOurFile = sourceFileUri;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    StringBuffer response = new StringBuffer();
    try
    {
        FileInputStream fileInputStream = new FileInputStream(new File(pathToOurFile));
        URL url = new URL(root);
        connection = (HttpURLConnection) url.openConnection();

        if (token != null)
        {
            connection.setRequestProperty("Authorization", "Basic " + token);
        }
        if (username != null)
        {
            connection.setRequestProperty("Username", username);
        }
        if (fileStyle != null)
        {
            connection.setRequestProperty("file-type", fileStyle);
        }

        String fileExtension = FilenameUtils.getExtension(sourceFileUri);
        String mime = Utils.getFileMIME(fileExtension);

        Log.d("uploadMultipartFile","fileExtension:"+fileExtension+",mime:"+mime);

        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);

        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Cache-Control", "no-cache");
        connection.setRequestProperty("User-Agent", "CodeJava Agent");
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

        outputStream = new DataOutputStream(connection.getOutputStream());
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);
        outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\""
                + pathToOurFile + "\"" + lineEnd);
        outputStream.writeBytes("Content-Type: "+ mime + lineEnd);

        outputStream.writeBytes(lineEnd);

        byte[]bytes = IOUtils.toByteArray(fileInputStream);
        outputStream.write(bytes);

        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        int serverResponseCode = connection.getResponseCode();
        String serverResponseMessage = connection.getResponseMessage();
        Log.i(HttpUtil.class.getSimpleName(), String.valueOf(serverResponseCode));
        Log.i(HttpUtil.class.getSimpleName(), serverResponseMessage);

        fileInputStream.close();
        outputStream.flush();
        outputStream.close();

        BufferedReader br=null;
        if(connection.getResponseCode()>=200 && connection.getResponseCode()<300)
        {
            br = new BufferedReader(new InputStreamReader((connection.getInputStream())));

        }
        else if(connection.getResponseCode()>=400)
        {
            br = new BufferedReader(new InputStreamReader((connection.getErrorStream())));
        }
        String inputLine;
        while ((inputLine = br.readLine()) != null) {
            response.append(inputLine);
        }
        System.out.println("result from server:"+response.toString());
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }
    return response.toString();
}