*** UDP Discard Client mod *** 

package untitled12;

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

public class UDPDiscardClientmod {

  public final static int port = 9;

  static byte[] buffer = new byte[65507];  /* mod */

  public static void main(String[] args) {

    String hostname;

    if (args.length > 0) {
      hostname = args[0];
    }
    else {
      hostname = "localhost";
    }

    try {


      DatagramPacket dp = new DatagramPacket(buffer, buffer.length);/* mod */


      String theLine;
      DatagramPacket theOutput;

      InetAddress server = InetAddress.getByName(hostname);
      DataInputStream userInput = new DataInputStream(System.in);
      DatagramSocket theSocket = new DatagramSocket();
      while (true) {
        theLine = userInput.readLine();
        if (theLine.equals(".")) break;
        byte[] data = new byte[theLine.length()];
        theLine.getBytes(0, theLine.length(), data, 0);
        theOutput = new DatagramPacket(data, data.length, server, port);
        theSocket.send(theOutput);
        theSocket.receive(dp);      /* mod */
        String s = new String(dp.getData(), 0, 0, dp.getLength());  /* mod */
        System.out.println("Data e hora: " + s);/* mod */
      }  // end while
    }  // end try
    catch (UnknownHostException e) {
      System.err.println(e);
    }  
    catch (SocketException se) {
      System.err.println(se);
    }
    catch (IOException e) {
      System.err.println(e);
    }

  }  // end main

}







	*** UDP Discard Server mod *** 


package untitled12;

import java.net.*;
import java.io.*;
import java.util.*;   /* mod */

public class UDPDiscardServermod {

  public final static int discardPort = 9;
  static byte[] buffer = new byte[65507];

  public static void main(String[] args) {

    int port;

    try {
      port = Integer.parseInt(args[0]);
    }
    catch (Exception e) {
      port = discardPort;
    }

    try {
      DatagramSocket ds = new DatagramSocket(port);
      DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
      while (true) {
        try {
          ds.receive(dp);
          String s = new String(dp.getData(), 0, 0, dp.getLength());
          Date d = new Date ();
          System.out.println(dp.getAddress() + " at port " + dp.getPort() + " says " + s  /*+"hora " + d*/);
          String x = d.toString();
          byte[] data = new byte[x.length()];
          x.getBytes(0, x.length(), data, 0);
          dp.setData(data);  // DatagramPacket saida = new DatagramPacket(data, data.length, dp.getAddress(), 9);
          dp.setLength(data.length);
          ds.send(dp);
        }
        catch (IOException e) {
          System.err.println(e);
        }
       } // end while
    }  // end try
    catch (SocketException se) {
      System.err.println(se);
    }  // end catch

  }  // end main

}