Letting my program command the command prompt

[Smokey.]

Hi all,

I need to create a program that can send commands to the command prompt, and be able to control the telnet client. How can i accomplish this?

EDIT: btw, I'm using a Swing GUI.

[Smokey.]

 try {
            Runtime rt = Runtime.getRuntime();
            String command = "telnet 192.168.2.254";
            Process pr = rt.exec(command);

            BufferedReader processOutput = new BufferedReader(new InputStreamReader(pr.getInputStream()));
            BufferedWriter processInput = new BufferedWriter(new OutputStreamWriter(pr.getOutputStream()));

            String commandToSend = "";
            processInput.write(commandToSend);
            processInput.flush();

            int lineCounter = 0;
            while (true)
            {
                String line = processOutput.readLine();
                if (line == null)
                {
                    break;
                }
                System.out.println(++lineCounter + ": " + line);
            }

            processInput.close();
            processOutput.close();
            pr.waitFor();
        } catch (Exception x) {
            x.printStackTrace();
        }
    }

I know the coding isnt complete, but when i try to lauch it i get an exception:

java.io.IOException: Cannot run program "telnet": CreateProcess error=2, Het systeem kan het opgegeven bestand niet vinden (system cant find file)
at java.lang.ProcessBuilder.start(ProcessBuilder.java :460)
at java.lang.Runtime.exec(Runtime.java:593)
at java.lang.Runtime.exec(Runtime.java:431)
at java.lang.Runtime.exec(Runtime.java:328)
at testcmdsender.Main.main(Main.java:12)

help? =D

[toadaly]

It appears that 'telnet' is not in the path, since the exception is complaining that it can't find it. You might try giving a full path to telnet, or ensuring your environment is properly set up from the account launching it.

[Smokey.]

Thnx, I'll try that. On the other hand, i have no clue how to get my envirement "ready". Could you spare some tips? :) Im totally new to threading within java.

[toadaly]

How you set up your environment path completely depends on your OS. The path has nothing to do with java or threads, it's an OS issue.