UDP编程简单案例

package UDP;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
//接收端
public class TestUdpR {

    public static void main(String[] args) throws IOException {
        //建立UDP的服务
        DatagramSocket socket = new DatagramSocket(9000);
        //准备空数据包用于存储数据
        byte buf[] = new byte[1024];
        DatagramPacket dataPacket = new DatagramPacket(buf, buf.length);
        //调用UDP服务接收数据
        socket.receive(dataPacket);
        System.out.println(new String(buf, 0, dataPacket.getLength()));//getLength()获取接收数据的长度
        //关闭资源
        socket.close();
        
    }

}

package UDP;

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

//发送端
public class TestUdpT {

    public static void main(String[] args) throws IOException {
        //建立UDP的服务
        DatagramSocket dgs = new DatagramSocket();
        //准备数据，把数据封装到数据包中
        String data = "This is UDP Packet";
        //创建一个数据包
        DatagramPacket packet = new DatagramPacket(data.getBytes(), data.getBytes().length,InetAddress.getLocalHost(),9000);
        //调用UDP的服务发送数据
        dgs.send(packet);
        //关闭资源
        dgs.close();
    }

}