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Java code:

//·þÎñÆ÷¶Ë
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class TestServer
{

public static void main(String[] args) throws IOException
{
DatagramSocket chatUDPSocket = new DatagramSocket(8888);
while(true)
{
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket = new DatagramPacket(recvBuf , recvBuf.length);
chatUDPSocket.receive(recvPacket);
System.out.println(recvPacket.getSocketAddress().toString());
}
}

}



Java code:

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;

public class TestClient
{

public static void main(String[] args) throws IOException
{
DatagramSocket clienttoclient = new DatagramSocket();
String sendStr = "hello";
byte[] sendBuf = sendStr.getBytes();
InetAddress addr = InetAddress.getByName("125.34.69.243");


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import java.io.*;
class FileTest
{
public static void main(String [] args) throws Exception
{

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