pkcspassworddialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: PKCSPasswordDialog.java,v 1.3 2001/05/07 12:37:22 kunugi Exp $
**
** Copyright (c) 2000-2001 Jeff Gay
** on behalf of ICEMail.org <http://www.icemail.org>
** Copyright (c) 1998-2000 by Timothy Gerard Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
*/

package org.icemail.mail.smime;


import java.awt.*;
import java.awt.event.*;
import java.net.InetAddress;

import javax.swing.*;
import javax.swing.border.*;

import javax.mail.*;

import org.icemail.util.AWTUtilities;


public class PKCSPasswordDialog
  extends JDialog
  implements ActionListener
{
  private String         password;
  private boolean        clickedOK;
  private JPasswordField passField;


  public
  PKCSPasswordDialog( Frame parent, String title, String addr ) {
    super( parent, title, true );
    this.establishContents( addr );
    this.pack();

    this.addWindowListener(
      new WindowAdapter()
        {
        public void
        windowActivated( WindowEvent event )
          {
          passField.requestFocus();
          passField.selectAll();
          }
        }
      );
  }

  public String
  getPassword() {
    return this.password;
  }

  public void
  actionPerformed( ActionEvent event ) {
    boolean doDispose = false;
    String command = event.getActionCommand();

    if ( command.equals( "OK" ) ) {
      doDispose = true;
      this.clickedOK = true;
      this.password = new String( this.passField.getPassword() );
    } else if ( command.equals( "CANCEL" ) ) {
      doDispose = true;
      this.clickedOK = false;
      this.password = null;
    } else if ( event.getSource() == this.passField ) {
      doDispose = true;
      this.clickedOK = true;
      this.password = new String( this.passField.getPassword() );
    }

    if ( doDispose ) {
      this.dispose();
    }
  }

  protected void
  establishContents( String addr ) {
    int row = 0;
    JLabel lbl = null;

    Container contentPane = this.getContentPane();
    contentPane.setLayout( new GridBagLayout() );

    JPanel content = new JPanel();
    content.setLayout( new GridBagLayout() );
    content.setBorder( new EmptyBorder( 5, 5, 5, 5 ) );
    contentPane.add( content );

    lbl = new NoFocusLabel( "EMail Address:" );
    lbl.setForeground( Color.black );
    lbl.setBorder( new EmptyBorder( 1, 1, 1, 4 ) );
    AWTUtilities.constrain( content, lbl, GridBagConstraints.NONE,
                            GridBagConstraints.WEST, 0, row, 1, 1, 0.0, 0.0 );

    JLabel addrLbl = new NoFocusLabel( addr );
    addrLbl.setHorizontalAlignment( JLabel.LEFT );
    addrLbl.setBorder( new CompoundBorder
        ( new EmptyBorder( 2, 0, 6, 0 ),
          new CompoundBorder
            ( new BevelBorder( BevelBorder.LOWERED ),
              new EmptyBorder( 1, 2, 1, 2 ) ) ) );

    AWTUtilities.constrain( content, addrLbl, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

    lbl = new NoFocusLabel( "Password:" );
    lbl.setForeground( Color.black );
    lbl.setBorder( new EmptyBorder( 1, 1, 1, 4 ) );
    AWTUtilities.constrain( content, lbl, GridBagConstraints.NONE,
                            GridBagConstraints.WEST, 0, row, 1, 1, 0.0, 0.0 );

    this.passField = new JPasswordField( 20 );
    this.passField.setEchoChar( '*' );
    this.passField.addActionListener( this );
    AWTUtilities.constrain( content, this.passField, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

    AWTUtilities.constrain( content, new JSeparator( JSeparator.HORIZONTAL ),
                            GridBagConstraints.HORIZONTAL, GridBagConstraints.WEST,
                            0, row++, 2, 1, 1.0, 0.0, new Insets( 7, 0, 0, 0 ) );

    JPanel ctlPan = new JPanel();
    ctlPan.setLayout( new BorderLayout() );

    AWTUtilities.constrain( content, ctlPan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 0.0 );

    JPanel btnPanel = new JPanel();
    btnPanel.setLayout( new GridLayout( 1, 2, 25, 7 ) );
    btnPanel.setBorder( new EmptyBorder( 8, 5, 1, 1 ) );

    JButton okBtn = new JButton( "Ok" );
    okBtn.setActionCommand( "OK" );
    okBtn.addActionListener( this );
    btnPanel.add( okBtn );

    JButton canBtn = new JButton( "Cancel" );
    canBtn.setActionCommand( "CANCEL" );
    canBtn.addActionListener( this );
    btnPanel.add( canBtn );

    ctlPan.add( BorderLayout.EAST, btnPanel );
    }

  private class NoFocusLabel
    extends JLabel
  {
    public
    NoFocusLabel( String text ) {
      super( text );
    }

    public boolean
    isFocusTraversable() {
      return false;
    }
  }
}