Talk to Java Runtime Process.getOutputStream()

Question

Hi Experts,
Good day. I just want to ask I'm actually having this problem. I'm trying to talk to the outputstream and submit a message to telnet but it seems to be that it's not accepting my message.
private void sendMessage(String message) {
          try {
               runtime = Runtime.getRuntime();
               process = runtime.exec("telnet computer_name 9800");
               System.out.println(process.getOutputStream());
               PrintWriter pw = new PrintWriter(process.getOutputStream());
               pw.println(message);
               BufferedReader in1 = new BufferedReader(new InputStreamReader(process.getInputStream()));
               BufferedReader in2 = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               boolean error = false;
               String data;
               StringBuffer inputStream = new StringBuffer();
               while ((data = in1.readLine()) != null) {
                    error = true;
                    System.out.println(data);
                    inputStream.append(data + "\n");
               } while ((data = in2.readLine()) != null) {
                    error = true;
                    System.out.println(data);
                    inputStream.append(data);
                    inputStream.append("\n");
               in1.close();
               in2.close();
               pw.flush();
               pw.close();
          } catch(Exception e) {
               e.printStackTrace();
}For the record I have my server running using the correct port number assigned above. If I access the server manually in command prompt, submitting a message is working, however my code does not.
Edited by: The_Developer on May 9, 2008 8:17 AM

Answer 1

The_Developer wrote:
Mine is GUI application and not a command console application, part of it has thread specially reading through the input stream what I have written here is a small version only and I don't need to actually copy the whole code from the site just to understand it :)
Edited by: The_Developer on May 9, 2008 8:44 AMAlso, there is a further problem then since the OS stdout stream has a 4K (ish) buffer and you will not see any output until the process closes OR until the buffer fills OR the process calls flush().