J++ using ping command

I'm trying to write a windows app that uses the dos ping command. Simply help, how do you do go about reading/writing text write "ping" and then read the response. Any pointers in the right direction would be great.
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An example from Inquirt.com...

This program opens a connection to the echo server (always port 7) of a given host (using the domain name instead of the IP address, hope that's okay), sends the string "Hello," reads the response, then compares it with the string sent:

import java.io.*;
import java.net.*;

class Ping {

   public static void main(String args[]) {
      try {
         Socket t = new Socket(args[0], 7);
         DataInputStream is = new DataInputStream(t.getInputStream());
         PrintStream os = new PrintStream(t.getOutputStream());

         String str = is.readLine();

         if (str.equals("Hello"))
           System.out.println("Alive :-)") ;
            System.out.println("Dead :-(");


      catch (IOException e) {System.out.println("Error: " + e);}

run it like...

java Ping [host name]

You could also use the exec command to execute the Ping command from a dos box.

Do you need to know how to do this? Well you can do it like this...

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
 * Workaround for jdk 1.1 bug in NT where Process.waitFor()
 * never comes back.  This has only been tested on NTW 4.0.
public class SystemCall {
  public static void main( String args[]) {
  try {
    Runtime r = Runtime.getRuntime();
    Process p = r.exec( "ping");
    InputStream  in  = p.getInputStream();
    boolean finished = false;  // Set to true when p is finished
    while( !finished) {
      try {
        while( in.available() > 0) {
          // Print the output of our system call.
          Character c = new Character( (char) in.read());
          System.out.print( c);
        // Ask the process for its exitValue.  If the process
        // is not finished, an IllegalThreadStateException
        // is thrown.  If it is finished, we fall through and
        // the variable finished is set to true.
        finished = true;
      } catch (IllegalThreadStateException e) {

    // Sleep a little to save on CPU cycles

} catch (Exception e) { System.err.println( e); }

This fires off the ping command in a dos shell and captures the output from it so you can print it our or examine it.


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Cheers, GrahamOrr.

Only a B though? Must have made a spelling mistake...:)
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