Help with ping in cmd?

Question

hello there
i've made a small program that pings on a dns using cmd
and my problem here that :i want to do some action if the result is replay
and do some other action if the result is request,how to do that?
here is my code:
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.io.InputStream;
public class PingCheck {
    public static void main(String[] args) throws Exception {
         JTextArea textarea=new JTextArea(15,15);
         JScrollPane scrollpane=new JScrollPane(textarea);
         textarea.setFont(new Font("Courier New",Font.BOLD,13));
         textarea.setEditable(false);
         JFrame frame=new JFrame("Ping Check");
         frame.add(scrollpane);
         frame.setSize(500,220);
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);               
        InputStream is=Runtime.getRuntime().exec("ping 212.122.224.10 -t").getInputStream();
         int x;    
         while((x=(int) is.read())!=-1) {        
              textarea.append(""+(char)x);
            textarea.setCaretPosition( textarea.getDocument().getLength() );          
}

Answer 1

(because you sound desperate... :)
If you must use ping with Runtime.getRuntime().exec (and a byte input stream) then ...
import java.lang.Process;... so that you can get a handle on the ping subprocess and shut it down.
The following waits for 4 replies (whether timed-out or not) and then updates the textarea:
     try {
          Process proc = Runtime.getRuntime().exec("ping 212.122.224.10");
          InputStream is = proc.getInputStream();
          int x, lines = 0;
          StringBuffer sb = new StringBuffer();
          while(((x=(int)is.read())!=-1)&&(lines<7))
               sb.append((char)x);
               if (x == '\n') lines++;
          proc.destroy(); // shutdown the subprocess
          String response = new String(sb);
          textarea.setText(response);
          textarea.setCaretPosition( textarea.getDocument().getLength());
          if(response.indexOf("Reply") > -1)
              System.out.println("Reply Received");
          else
              System.out.println("Request timed out");
     } catch (IOException e) {
          e.printStackTrace();