udp服务器

package com.zy;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UdpSever {

public static void main(String[] args) throws Exception {
    // TODO Auto-generated method stub
            DatagramSocket ds=new DatagramSocket(9999);
            byte b[]=new byte[1024];
            DatagramPacket dp=new DatagramPacket(b, b.length);
            ds.receive(dp);
            System.out.println(new String(b).trim());
            String s="你好服务器";
            DatagramPacket ndp=new DatagramPacket(s.getBytes(), s.getBytes().length,InetAddress.getLocalHost(),8888 );
            ds.send(ndp);
}

}