java - php

Hi i want to send a file to php (with post) and i also want to set a
variable in the same form. example ("&myvar=" + myvar).

I have gotten the first piece to work but i dont know how to set the
variable under the same session, any help would be appriciated!

Here is the send file metod (that i want to extend to include setting
the variable)

    public void postFile(String exsistingFileName) {
    try {
        FileInputStream fileInputStream = new FileInputStream( new
                                   File(exsistingFileName) );

        // Open a HTTP connection to the URL
        System.out.println("Connecting to server...");

        conn = (HttpsURLConnection) (new URL(urlString)).openConnection();

        // Allow Input/Output
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary="+boundary);

        dos = new DataOutputStream(conn.getOutputStream() );
        if (!SecureConnection.isSecure(conn)) {
        System.out.println("Connection not secure!");
        return;
        }

        System.out.println("Sending query to server...");

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data;
name=\"datafile\";"
               + " filename=\"" + exsistingFileName +"\"" + 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);
        }

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

//----------------------- i guess i should set the var before i close
the streams
//----------------------- how? i dont know

        // close streams
        fileInputStream.close();
        dos.flush();
        dos.close();
    }
    catch (MalformedURLException ex) {
        System.out.println("From ServletCom CLIENT REQUEST:"+ex);
    }
    catch (IOException ioe) {
        System.out.println("From ServletCom CLIENT REQUEST:"+ioe);
    }

    //read the server response
    try {
        BufferedReader br = new BufferedReader(new
InputStreamReader(conn.getInputStream()));
        String str;

        while (( str = br.readLine()) != null) {
        System.out.println("Server response is: "+str);
        System.out.println("");
        }
        br.close();
        System.out.println("Cosed connnection to server.");
    }
    catch (IOException ioex) {
        System.out.println("From (ServerResponse): "+ioex);
        
    }
    }