URLs and URIs - Java Network Programming - page 165

Example 5-11. A GUI authenticator
import java.awt.* ;
import java.awt.event.* ;
import java.net.* ;
import javax.swing.* ;
public class DialogAuthenticator extends Authenticator {
private JDialog passwordDialog ;
private JTextField usernameField = new JTextField ( 20 );
private JPasswordField passwordField = new JPasswordField ( 20 );
private JButton okButton = new JButton ( "OK" );
private JButton cancelButton = new JButton ( "Cancel" );
private JLabel mainLabel
= new JLabel ( "Please enter username and password: " );
public DialogAuthenticator () {
this ( "" , new JFrame ());
}
public DialogAuthenticator ( String username ) {
this ( username , new JFrame ());
}
public DialogAuthenticator ( JFrame parent ) {
this ( "" , parent );
}
public DialogAuthenticator ( String username , JFrame parent ) {
this . passwordDialog = new JDialog ( parent , true );
Container pane = passwordDialog . getContentPane ();
pane . setLayout ( new GridLayout ( 4 , 1 ));
JLabel userLabel = new JLabel ( "Username: " );
JLabel passwordLabel = new JLabel ( "Password: " );
pane . add ( mainLabel );
JPanel p2 = new JPanel ();
p2 . add ( userLabel );
p2 . add ( usernameField );
usernameField . setText ( username );
pane . add ( p2 );
JPanel p3 = new JPanel ();
p3 . add ( passwordLabel );
p3 . add ( passwordField );
pane . add ( p3 );
JPanel p4 = new JPanel ();
p4 . add ( okButton );
p4 . add ( cancelButton );
pane . add ( p4 );
passwordDialog . pack ();
ActionListener al = new OKResponse ();