UDP Client (Java)

import java.io.*;
import java.net.*;

public class JavaUDPClient {
    public static void main(String args[])
    {
     int portout=6666;

     try {
        String host = "127.0.0.1";

        if (args.length > 0)
           host = args[0];
        if (args.length > 1)
           portout = Integer.parseInt(args[1]);

      BufferedReader in =
        new BufferedReader(new InputStreamReader(System.in));

      DatagramSocket clientSocket = new DatagramSocket();

      InetAddress IP = InetAddress.getByName(host);
      System.out.println ("Connessione a " + IP +
                          " tramite la porta UDP "+ portout);

      byte[] datiInviati ;
      while (true) {
        System.out.print("Scrivi messaggio: ");
        String s = in.readLine();
        if (s.equals("CIAO"))
            break;
        datiInviati = s.getBytes();

        System.out.println ("Invio di un pacchetto di " + datiInviati.length +
                          " byte al server.");
        DatagramPacket sendPacket =
         new DatagramPacket(datiInviati, datiInviati.length, IP, portout);

        clientSocket.send(sendPacket);

      }
      clientSocket.close();
     }
   catch (Exception e) {
     System.err.println(e);
    }
  }
}