How to upload multiple files within a single request?

Question

i am trying to upload multiple files in single request. single file is uploading successfully but how to do in multiple case?

Here is for Single file upload ...

    public String uploadfile(String sourceFileUri) {

    String fileName = "";
    File file = null;
    String updatedFileName = "";

    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    String HeyfileName = ""; 
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    // int maxBufferSize = 1 * 1024 * 1024; 5000000
    int maxBufferSize = 5000000;
    // File sourceFile = sourceFileUri;
    File sourceFile = new File(sourceFileUri);
    if (!sourceFile.isFile()) {
        Log.e("uploadFile", "Source File Does not exist");

    }
    File f = new File(sourceFileUri);        
      File files[] = f.listFiles();
      for (int i=0; i < files.length; i++) {                               
          // upload file here and when the fileUpload is complete the you save it to the array.. thats wat i think is best.. because you never know
          //Thread  or asynctask                         
      }

    System.out.println("Source file uri is " + sourceFileUri);
    if (sourceFileUri.contains(".pdf")) {
        fileName = sourceFileUri; /* +"default.jpg" */

        long unixTime = System.currentTimeMillis() / 1000L;
        fileName = "file:///" + sourceFileUri;
        HeyfileName =    unixTime + ".pdf"; 


    } else { 
        MessageDialog.showMessage("Alert!", "Please upload only pdf file!",
                User_dashboard.this);

    }


    try {

        InputStream contentInputStream = getContentResolver()
                .openInputStream(Uri.parse(fileName));
        URL url = new URL(upLoadServerUri);

        // Open a HTTP connection to the URL
        conn = (HttpURLConnection) url.openConnection();
        conn.setDoInput(true); // Allow Inputs
        conn.setDoOutput(true); // Allow Outputs
        conn.setUseCaches(false); // Don't use a Cached Copy
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.setRequestProperty("ENCTYPE", "multipart/form-data");
        // conn.setRequestProperty("Content-Type", "application/pdf" +
        // boundary);
        conn.setRequestProperty("Content-Type",
                "multipart/form-data;boundary=" + boundary);
        conn.setRequestProperty("uploaded_file", HeyfileName);

        dos = new DataOutputStream(conn.getOutputStream());

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"PDF_File\";filename=\""
                + HeyfileName + "\"" + lineEnd);
        // dos.writeBytes
        // ("Content-Disposition: form-data; name="uploadedfile";filename="" + selectedPath + """
        // + lineEnd);
        dos.writeBytes(lineEnd);

        // create a buffer of maximum size
        bytesAvailable = contentInputStream.available();

        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        buffer = new byte[bufferSize];

        // read file and write it into form...
        bytesRead = contentInputStream.read(buffer, 0, bufferSize);

        while (bytesRead > 0) {

            dos.write(buffer, 0, bufferSize);
            bytesAvailable = contentInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            bytesRead = contentInputStream.read(buffer, 0, bufferSize);

        }

        // send multipart form data necesssary after file data...
        dos.writeBytes(lineEnd);
        dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
        // Map<String, List<String>> response = conn.getRequestProperties();
        // Responses from the server (code and message)
        // serverResponseCode = conn.getResponseMessage();

        String serverResponseMessage = conn.getResponseMessage();

        Log.i("uploadfile", "HTTP Response is : " + serverResponseMessage
                + ": " + serverResponseCode);

        if (serverResponseCode == 200) {

            /*
             * runOnUiThread(new Runnable() { public void run() {
             * 
             * String msg =
             * "File Upload Completed.\n\n See uploaded file here : \n\n"
             * +" http://demo.spearheadss.com/twerck/public/resource/image/"
             * +uploadFileName;
             * 
             * messageText.setText(msg); Toast.makeText(UploadToServer.this,
             * "File Upload Complete.", Toast.LENGTH_SHORT).show(); } });
             */
        }

        // close the streams //*/
        BufferedReader in = new BufferedReader(new InputStreamReader(
                conn.getInputStream()));
        String inputLine;
        String LogString = "";

        while ((inputLine = in.readLine()) != null) {
            LogString = LogString + inputLine;
        }
        responseServer = LogString.toString();
        // Log.i(Utils.TAG, LogString);
        // close streams
        contentInputStream.close();
        dos.flush();
        dos.close();

    } catch (MalformedURLException ex) {

        pdialog.dismiss();
        ex.printStackTrace();

        runOnUiThread(new Runnable() {
            public void run() {
                // messageText.setText("MalformedURLException Exception : check script url.");
                Toast.makeText(User_dashboard.this,
                        "MalformedURLException", Toast.LENGTH_SHORT).show();
            }
        });

        Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
    } catch (Exception e) {
        System.out.println("Error in uploading: " + e);
        pdialog.dismiss();
        e.printStackTrace();

        runOnUiThread(new Runnable() {
            public void run() {
                // messageText.setText("Got Exception : see logcat ");
                Toast.makeText(User_dashboard.this,
                        "Uploading failed : please retry",
                        Toast.LENGTH_SHORT).show();
            }
        });
        Log.e("Upload file to server Exception",
                "Exception : " + e.getMessage(), e);
    }

    try {

        inStream = new DataInputStream(conn.getInputStream());
        String str;

        while ((str = inStream.readLine()) != null) {

            Log.e("Debug", "Server Response " + str);

        }

        inStream.close();

    } catch (IOException ioex) {
        Log.e("Debug", "error: " + ioex.getMessage(), ioex);
    }
    pdialog.dismiss();
    return responseServer;

    // } // End else block
}

but i want to upload multiple files i have a list of files here

List<String> fileNameList = new ArrayList<String>();
fileNameList .add(file1);
fileNameList .add(file2);
fileNameList .add(file3);

assuming file name is as follows;

  file1 = "/sdcard/selected1.pdf";
  file2 = "/sdcard/selected1.pdf";
  file3 = "/sdcard/selected1.pdf";

this is giving me exception

InputStream contentInputStream = getContentResolver()
                .openInputStream(Uri.parse(myFiles.toString()));

now i am not getting how to pass fileNameList so that i can upload this. is there any way?

Answer 1

Since you already have a sending class you could iterate through that list and pass one filename at time? Something like that comes to mind:

for (String fileName: fileNameList){ 
uploadFile(fileName);}