UDP发送方接收方模拟的Java程序

public class UDPReceiveDemo {
    public static void main(String[] args) throws IOException {
        //创建UDP接收端套接字对象
        DatagramSocket ds = new DatagramSocket(10086);

        //创建一个数据报，用于接收发来的数据
        byte[] bys = new byte[1024];
        int length = bys.length;
        DatagramPacket dp = new DatagramPacket(bys, length);

        //调用ds对象的receive()方法接收数据
        ds.receive(dp);
        System.out.println(dp.getLength());

        //从接收到的包中读出信息
        byte[] bys2 = dp.getData();
        int realLen = dp.getLength();
        String s = new String(bys2, 0, realLen);
        InetAddress ia = dp.getAddress();

        System.out.println( ia.getHostAddress() + "发来了"+ s);
        
        //释放资源
        ds.close();
    }
}

public class UDPsendDemo {
    public static void main(String[] args) throws IOException {
        //创建发送端的UDP套接字对象
        DatagramSocket ds = new DatagramSocket();

        //创建数据报包
        byte[] bys = "hello，UDP,我来了".getBytes();
        int length = bys.length;
//        InetAddress ia = InetAddress.getByName("PC-20200320HQPC");
        InetAddress ia = InetAddress.getByName("192.168.42.194");
        int port = 10086;
        DatagramPacket dp = new DatagramPacket(bys, length, ia,port);

        //调用Socket对象的send()方法
        ds.send(dp);

        //释放资源
        ds.close();
    }
}