UDP Time Client : UDP Client « Network « Java Tutorial

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Java Tutorial » Network » UDP Client 
19. 17. 3. UDP Time Client
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.DatagramChannel;

public class UDPTimeClient {

  public static void main(String[] argsthrows Exception {

    DatagramChannel channel = DatagramChannel.open();
    // port 0 selects any available port
    SocketAddress address = new InetSocketAddress(0);
    DatagramSocket socket = channel.socket();
    socket.setSoTimeout(5000);
    socket.bind(address);

    SocketAddress server = new InetSocketAddress("time.nist.gov"37);
    ByteBuffer buffer = ByteBuffer.allocate(8192);
    // time protocol always uses big-endian order
    buffer.order(ByteOrder.BIG_ENDIAN);
    // Must put at least one byte of data in the buffer;
    // it doesn't matter what it is.
    buffer.put((byte65);
    buffer.flip();

    channel.send(buffer, server);

    buffer.clear();
    buffer.put((byte0).put((byte0).put((byte0).put((byte0);
    channel.receive(buffer);
    buffer.flip();
    long secondsSince1970 = buffer.getLong();

    System.out.println(secondsSince1970);
    channel.close();

  }
}
19. 17. UDP Client
19. 17. 1. UDP Echo Client
19. 17. 2. UDP Discard Client
19. 17. 3. UDP Time Client
19. 17. 4. Send a Datagram
19. 17. 5. Sending a Datagram
19. 17. 6. Receiving a Datagram
19. 17. 7. Read and write with DatagramPacket
19. 17. 8. User Datagram Protocol Programming
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