UDP通讯协议实例

1.服务端

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

public class UDPDemo {

    public static void main(String[] args) {
        try {
            String info ="mm";
            byte[] bytes = info.getBytes();
            /* 数据报*/
            DatagramPacket dp = new DatagramPacket(
                    bytes,0,bytes.length, InetAddress.getByName("127.0.0.1"),8888);
            /* 本程序的端口*/
            DatagramSocket socket = new DatagramSocket(9000);
            socket.send(dp);
            socket.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

2.客户端

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

public class UDPClient {

    public static void main(String[] args) {
        byte[] bytes = new byte[1024];
        /* 数据报*/
        DatagramPacket dp = new DatagramPacket(bytes,bytes.length);

        try {
            DatagramSocket socket = new DatagramSocket(8888);
            socket.receive(dp);
            String s = new String(dp.getData(),0,dp.getLength());
            System.out.println(s);
            socket.close();
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}