Java网络编程UDP通信

发送端

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

public class UDPSend {
    public static void main(String[] args) throws IOException {
        DatagramSocket datagramSocket = new DatagramSocket();
        byte[] bytes = "hello,upd,我来了".getBytes();
        int length = bytes.length;
        InetAddress address = InetAddress.getByName("192.168.121.1");
        int port = 10086;
        DatagramPacket datagramPacket = new DatagramPacket(bytes, length, address, port);
        datagramSocket.send(datagramPacket);
        datagramSocket.close();
    }
}

接收端

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

public class UDPReceive {
    public static void main(String[] args) throws IOException {
        DatagramSocket datagramSocket = new DatagramSocket(10086);
        byte[] bytes = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length);
        datagramSocket.receive(datagramPacket);
        byte[] datas = datagramPacket.getData();
        int length = datagramPacket.getLength();
        String dataString = new String(datas,0,length);
        System.out.println("数据是："+dataString);
        datagramSocket.close();
    }
}