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Thread: Trying to create a GUI front end for a TELNET application

  1. #1
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    Default Trying to create a GUI front end for a TELNET application

    Dear Members,

    I am trying to create a GUI which will accept an IP ( in a JText Field ) and will connect to a TELNET server.
    It will then issue a couple of telnet commands (like username, password and another command ) and then it will close.

    I am trying to make use of the Java Cookbook's Telnet Client program (Section 16.9) and accommodate it to run with a simple input field and button in a GUI.

    TELNET Program:
    import java.net.*;
    import java.io.*;
    /**
     * Telnet - very minimal (no options); connect to given host and service
     */
    public class Telnet {
        String host;
        int portNum;
        public static void main(String[] argv) {
            new Telnet().talkTo(argv);
        }
        private void talkTo(String av[]) {
            if (av.length >= 1)
                host = av[0];
            else
                host = "localhost";
            if (av.length >= 2)
                portNum = Integer.parseInt(av[1]);
            else portNum = 23;
            System.out.println("Host " + host + "; port " + portNum);
            try {
                Socket s = new Socket(host, portNum);
                // Connect the remote to our stdout
                new Pipe(s.getInputStream(), System.out).start();
                // Connect our stdin to the remote
                new Pipe(System.in, s.getOutputStream()).start();
            } catch(IOException e) {
                System.out.println(e);
                return;
            }
            System.out.println("Connected OK");
        }
    }
    /* This class handles one half of a full-duplex connection.
     * Line-at-a-time mode.
     */
    class Pipe extends Thread {
        BufferedReader is;
        PrintStream os;
        /** Construct a Pipe to read from "is" and write to "os" */
        Pipe(InputStream is, OutputStream os) {
            this.is = new BufferedReader(new InputStreamReader(is));
            this.os = new PrintStream(os);
        }
        /** Do the reading and writing. */
        public void run() {
            String line;
            try {
                while ((line = is.readLine()) != null) {
                    os.print(line);
                    os.print("\r\n");
                    os.flush();
                }
            } catch(IOException e) {
                throw new RuntimeException(e.getMessage());
            }
        }
    }

    My problem is that I do not know how to combine the TELNET program which is a console input with a button that will read a user given text.

    What I am trying to achieve:
       private void JB_updateActionPerformed(java.awt.event.ActionEvent evt) {                                          
            // TODO add your handling code here:
            String user_IP;
     
            //Get IP from Java Text Field
            user_IP = JTF_Input.getText();
     
            // Do nothing if text field is empty
            // Or Print out IP 
            if (!"".equals(user_IP)) {
                //Start Telnet client and pass IP
                //Pass Username password
                //Pass command
                //Receive Confirmation
                //Disconnect on successful confirmation
     
            }
        }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: Trying to create a GUI front end for a TELNET application

    Quote Originally Posted by arkroan View Post
    My problem is that I do not know how to combine the TELNET program which is a console input with a button that will read a user given text.
    public class PrettyTelnet extends Telnet

    set up your dialog to drop user input on the outgoing stream to the server and the user's display to show what the server sends back.

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