how to send data with file upload to the server

Question

I am currently uploading file in android. Now I want to send some data lets say and ID with that fileupload. So I will deal with this ID on the server side. Here is how I am uploading file. This code works perfectly fine.

Here is the code

public int uploadFile(String sourceFileUri, final String imageName) {
    //Toast.makeText(getApplicationContext(), imageName, Toast.LENGTH_LONG).show();
    String upLoadServerUri = "http://www.example.com/android/fileupload.php";
    String fileName = sourceFileUri;
    //Toast.makeText(getApplicationContext(), sourceFileUri, Toast.LENGTH_LONG).show();
    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;

    File sourceFile = new File(sourceFileUri);
    if (!sourceFile.isFile()) {
        Log.e("uploadFile", "Source File Does not exist");
        return 0;
    }

    try { 
        // open a URL connection to the Servlet
        FileInputStream fileInputStream = new FileInputStream(sourceFile);
        URL url = new URL(upLoadServerUri);
        conn = (HttpURLConnection) url.openConnection(); // Open a HTTP  connection to  the URL
        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);

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

        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);
        }

        // send multipart form data necesssary after file data...
        dos.writeBytes(lineEnd);
        dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        // Responses from the server (code and message)
        serverResponseCode = conn.getResponseCode();
        String serverResponseMessage = conn.getResponseMessage();

        Log.i("uploadFile", "HTTP Response is : " + serverResponseMessage + ": " + serverResponseCode);
        if(serverResponseCode == 200){
            runOnUiThread(new Runnable() {
                 public void run() {
                     //tv.setText("File Upload Completed.");
                     if(fileData(globalUID, imageName)) {
                         Toast.makeText(Camera.this, "File Upload Complete.", Toast.LENGTH_SHORT).show();
                     }
                 }
            });
        }
        //close the streams //
        fileInputStream.close();
        dos.flush();
        dos.close();

    } catch (MalformedURLException ex) {
        dialog.dismiss();
        ex.printStackTrace();
        Toast.makeText(Camera.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
        Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
    } catch (Exception e) {
        dialog.dismiss();
        e.printStackTrace();
        Toast.makeText(Camera.this, "Exception : " + e.getMessage(), Toast.LENGTH_SHORT).show();
        Log.e("Upload file to server Exception", "Exception : " + e.getMessage(), e);
    }

    dialog.dismiss();
    return serverResponseCode;
}

Answer 1

You can write query string onto output stream.

OutputStream os = conn.getOutputStream();
os.write( yourQueryString.getBytes( withSpecificCharset ) );

And in the server php script you can read query parameters as usual.

$param1 = $_POST[ "param1" ];

You can refer to BalusC's community wiki answer on How to use java.net.URLConnection to fire and handle HTTP requests?. It discussed with examples on HTTP Post with file upload and query parameters.