import java.io.*;
import java.lang.*;
import java.net.*;
public class uclient
{
 private DatagramSocket cli;
 private DatagramPacket pac;
 private byte sb[];
 private String sen;
 public uclient()
 {
  Init();
 }
 public void Init()
 {
  try
  {

   cli=new DatagramSocket(10002);
   sb=new byte[1024];
   sen="UDP方式發送數據";
   sb=sen.getBytes();
   pac=new DatagramPacket(sb,sb.length,InetAddress.getByName("localhost"),10005);
   cli.send(pac);
   }
   catch(SocketException se)
   {
     se.printStackTrace();
   }
   catch(IOException ie)
   {
     ie.printStackTrace();
   }
 }
 public static void main(String args[])
 {
  new uclient();
 }
}


import java.io.*;
import java.lang.*;
import java.net.*;
public class userve
{
 private DatagramSocket ser;
 private DatagramPacket pac;
 private byte rb[];
 private String rev;
 public userve()
 {
   Init();
 }
 public void Init()
 {
  try
  {
   ser=new DatagramSocket(10005);
   rb=new byte[1024];
   pac=new DatagramPacket(rb,rb.length);