UDPsocket编程

socket编程ＵＤＰ模式，

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();

        }

    }

}