UDP网络编程

package java2;

import org.junit.Test;

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

public class UDPTest {
    //发送端
    @Test
    public void sender() throws IOException {
        DatagramSocket socket = new DatagramSocket();

        String str = new String("我是一个以UDP方式发送的数据");
        byte[] data = str.getBytes();
        InetAddress inet = InetAddress.getByName("127.0.0.1");
        DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,8888);

        socket.send(packet);
        socket.close();
    }

    //接收端
    @Test
    public void receiver() throws IOException {
        DatagramSocket socket = new DatagramSocket(8888);

        byte[] buffer = new byte[100];
        DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);

        socket.receive(packet);
        System.out.println(new String(packet.getData(),0,packet.getLength()));

        socket.close();
    }
}