Whois Query - Java Network

Description

Whois Query
Demo Code


import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.util.regex.Pattern;

public class WhoisQuery {

    public static void main(String[] args) {
        if (args.length < 1) {
            System.err.println("Usage: java WhoisQuery [port] host...");
            return;
        }/*from w w w.  j av a2  s .  c  o m*/

        int port = 43;
        int firstArg = 0;
        if (Pattern.matches("[0-9]+", args[0])) {
            port = Integer.parseInt(args[0]);
            ++firstArg;
        }

        for (int i = firstArg; i < args.length; i++) {
            String host = args[i];

            try {
                query(host, port);
            } catch (IOException e) {
                System.err.println(host + ": " + port + "=" + e);
            }

        }

    }

    private static void query(String host, int port) throws IOException {
        InetAddress i = InetAddress.getByName("whois.internic.net");
        InetSocketAddress isa = new InetSocketAddress(i, port);
        ByteBuffer buf = ByteBuffer.allocateDirect(2048);

        try (SocketChannel sc = SocketChannel.open()) {
            sc.connect(isa);

            buf.clear();
            buf.put(host.getBytes());
            buf.putChar('\r');
            buf.putChar('\n');
            buf.flip();
            sc.write(buf);

            buf.clear();
            while (sc.read(buf) > -1) {
                buf.flip();
                byte[] receivedData = new byte[buf.remaining()];
                buf.get(receivedData);
                System.out.println(new String(receivedData));
                buf.clear();
            }

        } finally {

        }
    }

}
Whois Query - Java Network

Description

Demo Code

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