UDP---client+sever

public class UDP_Client {

       public static void main(String[] args) throws Exception {

             //1、创建服务 + 端口

            DatagramSocket client = new DatagramSocket(6666);

             //2、准备数据

            String msg = "我喜欢你" ;

             byte[] data = msg.getBytes();

             //3、打包（发送地点+端口）

            DatagramPacket packet =

                   new DatagramPacket(data, data.length , new InetSocketAddress("localhost" ,8888));

             //4、发送

            client.send(packet);

             //5、释放

            client.close();

      }

}

---

public class UDP_Server {

       public static void main(String[] args) throws Exception {

             //1、创建服务端+端口

            DatagramSocket server = new DatagramSocket(8888);

             //2、准备容器接收

             byte[] container = new byte[1024];

             //3、封装成包

            DatagramPacket packet = new DatagramPacket(container,container.length );

             //4、接受数据

            server.receive(packet);

             //5、分析数据

             byte[] data = packet.getData();

             int len = packet.getLength();

            System. out.println(new String(data, 0, len));

             //6、释放

            server.close();

            

      }

}