Autenticarsi ad un web service

[scrittore80]

Ciao,
sto sviluppando un client di un web service più o meno in questo modo:

import javax.xml.soap.*;
 import java.util.*;
 import java.net.URL;
 public class Request { 
public static void main(String[] args)
{ 
try 
{
 SOAPConnectionFactory soapConnectionFactory = SOAPConnectionFactory.newInstance(); 
SOAPConnection connection = soapConnectionFactory.createConnection(); SOAPFactory soapFactory = SOAPFactory.newInstance();
 MessageFactory factory =MessageFactory.newInstance();
 SOAPMessage message = factory.createMessage(); 
SOAPHeader header = message.getSOAPHeader(); 
//rimuovo questo nodo dall'alberatura header.detachNode(); 
//oppure header.addHeaderElement... 
SOAPBody body = message.getSOAPBody(); 
Name bodyName = soapFactory.createName("GetLastTradePrice", "m","http://wombats.ztrade.com");
 SOAPBodyElement bodyElement =body.addBodyElement(bodyName);
 Name name = soapFactory.createName("symbol"); 
SOAPElement symbol =bodyElement.addChildElement(name); symbol.addTextNode("SUNW"); 
URL endpoint = new URL("http://wombat.ztrade.com/quotes"); 
response =connection.call(message, endpoint); 
connection.close(); 
SOAPBody soapBody = response.getSOAPBody();
 Iterator iterator =soapBody.getChildElements(bodyName); 
bodyElement = (SOAPBodyElement)iterator.next(); 
String lastPrice = bodyElement.getValue(); 
System.out.print("The last price for SUNW is "); 
System.out.println(lastPrice); 
} catch (Exception ex) 
{ ex.printStackTrace(); }
 } 
} 

E quello che mi chiedo è: ma se io devo connettermi utilizzando username e password? coem posso fare?
Google-ando ho trovato questo metodo ma non mi convince.. c'è qualcosa di migliore?

Authenticator.setDefault(new Authenticator() { 
                @Override
                 protected PasswordAuthentication getPasswordAuthentication() {                     
return new PasswordAuthentication( username, password.toCharArray()); 
 } 
 });

Grazie!