[Java][Android] Upload funktioniert nur bei kleinen Dateien und ein Fortsch.anz.problem

final long fileSize = sourceFile.length();

// open a URL connection to the Servlet

FileInputStream fileInputStream = new FileInputStream(sourceFile);

URL url = new URL(upLoadServerUri);

Authenticator.setDefault (new Authenticator() {

    protected PasswordAuthentication getPasswordAuthentication() {

        return new PasswordAuthentication ("user", "pw".toCharArray());

    }

});

long sentBytes = 0;

HttpsURLConnection.setDefaultHostnameVerifier(new NullHostNameVerifier());

SSLContext context = SSLContext.getInstance("TLS");

context.init(null, new X509TrustManager[]{new NullX509TrustManager()}, new SecureRandom());

HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());

// 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", "multipart/form-data;boundary=" + boundary);

conn.setRequestProperty("uploaded_file", fileName);

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

dos.writeBytes(twoHyphens + boundary + lineEnd);

dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\"" + fileName + "\"" + lineEnd);

dos.writeBytes(lineEnd);

// create a buffer of  maximum size

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

buffer = new byte[bufferSize];

// read file and write it into form...

bytesRead = fileInputStream.read(buffer, 0, bufferSize);

while (bytesRead > 0) {

    dos.write(buffer, 0, bufferSize);

    bytesAvailable = fileInputStream.available();

    bufferSize = Math.min(bytesAvailable, maxBufferSize);

    bytesRead = fileInputStream.read(buffer, 0, bufferSize);

    sentBytes += bytesRead;

    progressBar(fileSize,sentBytes);

}

// send multipart form data necesssary after file data...

dos.writeBytes(lineEnd);

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

// Responses from the server (code and message)

int serverResponseCode = conn.getResponseCode();

String serverResponseMessage = conn.getResponseMessage();

//Log.i(TAG, "HTTP Response is : "

  //      + serverResponseMessage + ": " + serverResponseCode);

if(serverResponseCode == 200)

{

//

}

//close the streams //

fileInputStream.close();

dos.flush();

dos.close();