dialogauthentication.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: DialogAuthentication.java,v 1.4 2001/05/07 12:37:21 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;

import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Point;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.net.InetAddress;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JDialog;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.JMenu;

import javax.swing.border.EmptyBorder;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

import org.icemail.util.AWTUtilities; 
import org.icemail.util.ComponentFactory; 
import org.icemail.util.JFCUtilities; 


/**
 * This class represents an object that knows how to obtain authentication for
 * network connections from a user via a dialog.
 *
 * @see javax.mail.Authenticator
 */
public class DialogAuthentication
  extends Authenticator
{
  private AuthDialog    dialog_;

  /**
   * Default constructor.
   */
  public
  DialogAuthentication() {
    super();
  }

  /**
   * Called when password authentication is needed.
   * <p>
   * Implementation of javax.mail.Authenticator.getDialogUserName()
   *
   * @return authentication collected from user input, or null if none is provided
   */
  protected PasswordAuthentication
  getPasswordAuthentication() {
    dialog_ = this.new AuthDialog();

    dialog_.pack();

    Point loc = AWTUtilities.computeDialogLocation( dialog_ );

    dialog_.setLocation( loc.x, loc.y );

    dialog_.show();
    
    PasswordAuthentication result = dialog_.getAuthentication();

    return result;
  }

  private String
  getDialogPrompt() {
  // given a prompt?
    String prompt = getRequestingPrompt();
    if ( prompt == null )
      prompt = "Login to:";
    
  // protocol
    String protocol = getRequestingProtocol();
    if ( protocol == null )
      protocol = "Unknown";

  // get the host
    String host = null;
    InetAddress inet = getRequestingSite();
    if ( inet != null )
      host = inet.getHostName();
    if ( host == null )
      host = "Unknown";
    
  // port
    String port = "";
    int portnum = getRequestingPort();
    if ( portnum != -1 )
      port = "Port # " + portnum;

  // Build the info string
    Object[] xargs = new Object[4];
    xargs[0] = prompt;
    xargs[1] = host;
    xargs[2] = port;
    xargs[3] = protocol;
    String result = ICEMail.getBundle().getFormatString( "Authentication.Prompt", xargs );

    return result;
  }

  private String
  getUserName() {
    return super.getDefaultUserName();
  }

//............................................................

  private class AuthDialog
    extends JDialog
    implements ActionListener
  {
    private JTextField             userField;
    private JPasswordField         passField;

    private PasswordAuthentication authentication;

    public
    AuthDialog() {
      super();
      this.setModal( true );
      this.setTitle( ICEMail.getBundle().getString( "Authentication.Title" ) );
      this.authentication = null;
      this.establishContents();
    }

    public PasswordAuthentication
    getAuthentication() {
      return this.authentication;
    }

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

      if ( event.getSource() == this.userField ) {
        command = "NOOP";
        this.passField.requestFocus();
      } else if ( event.getSource() == this.passField ) {
        command = "OK";
      }

      if ( command.equals( "OK" ) ) {
        this.authentication =
          new PasswordAuthentication( this.userField.getText(),
                                      new String( this.passField.getPassword() ) );
        this.dispose();
      } else if ( command.equals( "CANCEL" ) ) {
        this.authentication = null;
        this.dispose();
      }
    }

    public void
    addNotify() {
      super.addNotify();

      if ( this.userField.getText().length() < 1 )
        this.userField.requestFocus();
      else
        this.passField.requestFocus();
    }

    public void
    establishContents() {
      int row = 0;

      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 );

      String prompt = getDialogPrompt();

    // prompt
      JLabel xlabel = new JLabel( prompt );
      xlabel.setHorizontalAlignment( JLabel.CENTER );
      xlabel.setBorder( new EmptyBorder( 2, 0, 4, 0 ) );
      AWTUtilities.constrain( content, xlabel, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 0, row++, 2, 1, 1.0, 0.0 );

    // information about the person we want back
      xlabel = ComponentFactory.getLabel( ICEMail.getBundle(), "Authentication.Username" );
      AWTUtilities.constrain( content, xlabel, GridBagConstraints.NONE,
                              GridBagConstraints.WEST, 0, row, 1, 1, 0.0, 0.0 );
      String defUser = getUserName();
      this.userField = new JTextField( defUser, 20 );
      this.userField.addActionListener( this );
      AWTUtilities.constrain( content, this.userField, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

      xlabel = ComponentFactory.getLabel( ICEMail.getBundle(), "Authentication.Password" );
      AWTUtilities.constrain( content, xlabel, 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 );

      JPanel btnPanel = new JPanel();
      btnPanel.setLayout( new GridLayout( 1, 2, 25, 10 ) );
      btnPanel.setBorder( JFCUtilities.StandardBorder );
      
      AWTUtilities.constrain( content, btnPanel, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 0, row++, 2, 1, 1.0, 0.0 );

      JButton xbutton;
      xbutton = ComponentFactory.getButton( ICEMail.getBundle(), "Authentication.OK",
                                            this, null );
      btnPanel.add( xbutton );

      xbutton = ComponentFactory.getButton( ICEMail.getBundle(), "Authentication.Cancel",
                                            this, null );
      btnPanel.add( xbutton );
    }
  }

}