Updated 28 July 2023
Most of the time we have to upload our file on server from our Application but when we try to find a way we got all the different ways to do so that make us more confused. Some says to use some library and some says not to. So here is a method to upload a file to the server via Http Multi-part form data, it doesn’t need any external library and is quiet efficient as well.
Through it you can have a put request to send you file with extra data like in my case I have to send an additional reference tag along with it. So lets start. Here I am supposing that you have a File Adapter and you have selected the file you have to send. Basically you have the URI of the file. If you don’t please follow the link.
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public class UploadFile extends AsyncTask<Object, String, String> { String file_name = ""; @Override protected String doInBackground(Object[] params) { try { String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; int bytesRead, bytesAvailable, bufferSize; byte[] buffer; int maxBufferSize = 1024 * 1024; //todo change URL as per client ( MOST IMPORTANT ) URL url = new URL("http://webkul.com/upload"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); // Allow Inputs & Outputs. connection.setDoInput(true); connection.setDoOutput(true); connection.setUseCaches(false); // Set HTTP method to POST. connection.setRequestMethod("POST"); connection.setRequestProperty("Connection", "Keep-Alive"); connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary); FileInputStream fileInputStream; DataOutputStream outputStream; outputStream = new DataOutputStream(connection.getOutputStream()); outputStream.writeBytes(twoHyphens + boundary + lineEnd); outputStream.writeBytes("Content-Disposition: form-data; name=\"reference\""+ lineEnd); outputStream.writeBytes(lineEnd); outputStream.writeBytes("my_refrence_text"); outputStream.writeBytes(lineEnd); outputStream.writeBytes(twoHyphens + boundary + lineEnd); outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadFile\";filename=\"" + uri.getLastPathSegment() +"\"" + lineEnd); outputStream.writeBytes(lineEnd); fileInputStream = new FileInputStream(uri.getPath()); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); buffer = new byte[bufferSize]; // Read file bytesRead = fileInputStream.read(buffer, 0, bufferSize); while (bytesRead > 0) { outputStream.write(buffer, 0, bufferSize); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); bytesRead = fileInputStream.read(buffer, 0, bufferSize); } outputStream.writeBytes(lineEnd); outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); // Responses from the server (code and message) int serverResponseCode = connection.getResponseCode(); String result = null; if (serverResponseCode == 200) { StringBuilder s_buffer = new StringBuilder(); InputStream is = new BufferedInputStream(connection.getInputStream()); BufferedReader br = new BufferedReader(new InputStreamReader(is)); String inputLine; while ((inputLine = br.readLine()) != null) { s_buffer.append(inputLine); } result = s_buffer.toString(); } fileInputStream.close(); outputStream.flush(); outputStream.close(); if (result != null) { Log.d("result_for upload", result); file_name = getDataFromInputStream(result, "file_name"); } } catch (Exception e) { e.printStackTrace(); } return file_name; } } |
So here are you. with this code you can send your file to server with extra form data.
If you have more details or questions, you can reply to the received confirmation email.
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8 comments
The code work for me but the file uploaded/file received in server contain only “my_reference_text” not content of my pdf file! Please help me with the issue!