UDP通信程序

UDP发送数据

package IPDemo;

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

public class SendDemo {
    public static void main(String[] args) throws IOException {
        DatagramSocket dgs = new DatagramSocket();
        byte[] bytes = "我爱你中国".getBytes();
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length, InetAddress.getByName("192.168.18.126"), 10086);
        dgs.send(dp);
        dgs.close();
    }
}

UDP接受数据

package IPDemo;

import com.sun.org.apache.xpath.internal.operations.String;

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

public class RerviceDemo {
    public static void main(String[] args) throws IOException {
        DatagramSocket dgs = new DatagramSocket(10086);
        byte[] bys = new byte[1024];
        DatagramPacket dgp = new DatagramPacket(bys, bys.length);
        dgs.receive(dgp);

//        byte[] datas = dgp.getData();
//        int length = dgp.getLength();
//        String s = new String(datas,0,length);
        System.out.println(new String(dgp.getData(), 0, dgp.getLength()));

        dgs.close();


    }
}