Input Stream to Output Stream

Question

I have a problem with my Post of a file to a REST API. The documentInputStream comes from a previous function to get the InputStream of a file and it works (it writes the file to my filesystem.

I also checked while debugging and documentInputStream has count = 35125 which is my file size (35Kb)

But the server is not getting any file. (This is not a server issue because it works with postman).

Any help?

  // Send document
    HttpURLConnection submitConnection = (HttpURLConnection) new URL(submitURL).openConnection();
    submitConnection.setRequestMethod("POST");
    submitConnection.setDoOutput(true);
    submitConnection.setUseCaches(false);
    // creates a unique boundary based on time stamp
    String boundary = "===" + System.currentTimeMillis() + "===";
    submitConnection.setRequestProperty("Content-Type","multipart/form-data; boundary=" + boundary);
    submitConnection.setRequestProperty("User-Agent", "Test Agent");

    // Get output stream
    DataOutputStream dataStream = new DataOutputStream(submitConnection .getOutputStream()); 

    // Write file input stream to the connection stream
    IOUtils.copy(documentInputStream, dataStream);
    // Flush
    dataStream.flush();

    // Get the response 
    BufferedReader rd = new BufferedReader(new InputStreamReader(submitConnection.getInputStream()));

this may be helpful: https://stackoverflow.com/questions/11766878/sending-files-using-post-with-httpurlconnection — mangusta, Oct 31 '18 at 12:14
the difference is that you're using IOUtils for some reason. try using OutputStream instead — mangusta, Oct 31 '18 at 12:53
I was using IOUtils to pass the inputstream of the file to the outputstream — user10498758, Oct 31 '18 at 13:16
so have you tried preparing the file wrapper and sending it directly to OutputStream without IOUtils? — mangusta, Oct 31 '18 at 13:18
you may save the file bytes from "documentInputStream" into a buffer first, then send that buffer to outputstream. I don't mean that you should send it that way. For now this is done for the sake of testing — mangusta, Oct 31 '18 at 14:00

Input Stream to Output Stream

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