import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class demol26 {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds=new DatagramSocket();
        Scanner sc=new Scanner(System.in);
        while (true){
            System.out.println("输入你要发的内容：");
            String s=sc.nextLine();
            if ("886".equals(s)){
                break;
            }
            byte[] bytes = s.getBytes();
            InetAddress sd=InetAddress.getByName("127.0.0.1");
            int port=10086;
            DatagramPacket dp=new DatagramPacket(bytes,bytes.length,sd,port);
            ds.send(dp);
        }
        ds.close();

    }
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class demol27 {
    public static void main(String[] args) throws IOException {
        DatagramSocket si=new DatagramSocket(10086);
        byte[]d=new byte[122];
        DatagramPacket sd=new DatagramPacket(d,d.length);
        while (true){
            si.receive(sd);
            byte[] e = sd.getData();
            int len=sd.getLength();
            String name = sd.getAddress().getHostName();
            System.out.println(name+"发送了："+new String(e,0,len));
        }

    }
}