UDPsocket编程

package com.wtd.socket.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class UDPServer {
    public static void main(String[] args) {
        try {
            DatagramSocket sever= new DatagramSocket(9000);
            byte[] data= new byte[100];
            DatagramPacket dPacket= new DatagramPacket(data, 0, data.length);
            sever.receive(dPacket);
            String string= new String(data, 0, data.length);
            byte[] data2= "hello client".getBytes();
            System.out.println(dPacket.getData());
            DatagramPacket dPacket2= new DatagramPacket(data2, 0, data2.length,dPacket.getSocketAddress());
            sever.close();
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
        }
        
    }
}

package com.wtd.socket.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class UDPClint {
    public static void main(String[] args) {
        try {
            DatagramSocket clint= new DatagramSocket();
            String str= "hello world";
            byte[] data= str.getBytes();
            DatagramPacket daPacket= new DatagramPacket(data, 0, data.length, new InetSocketAddress("127.0.0.1", 9000));
            clint.send(daPacket);
            clint.close();
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
}