java网络通讯udp

UDPClient

public class UDPClient {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(9999);
        byte[] data = new byte[1024];
        DatagramPacket packet = new DatagramPacket(data, data.length);
        socket.receive(packet);
        System.out.println("【客户端接收到的数据】" + new String(packet.getData(), 0, packet.getLength()));
        socket.close();
    }
}

UDPServer

public class UDPServer {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(9000);
        byte[] data = "hello world".getBytes();
        DatagramPacket packet = new DatagramPacket(data, 0, data.length, InetAddress.getByName("localhost"), 9999);
        socket.send(packet);
        socket.close();
    }
}