quickviewer.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: QuickViewer.java,v 1.10 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;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Image;
import java.awt.Insets;

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

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.PrintWriter;

import java.net.URL;

import java.text.DecimalFormat;
import java.text.SimpleDateFormat;

import java.util.Enumeration;
import java.util.Date;

import javax.mail.Address;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;

import javax.mail.internet.ContentType;
import javax.mail.internet.InternetHeaders;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.ParseException;

import javax.activation.CommandInfo;
import javax.activation.DataHandler;
import javax.activation.MimeType;
import javax.activation.MimeTypeParseException;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JEditorPane;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;

import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

import javax.swing.undo.UndoManager;

import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.EditorKit;
import javax.swing.text.StyledDocument;

import javax.swing.border.EmptyBorder;

import org.icemail.Package;

import org.icemail.smime.SMIMELibrary;
import org.icemail.smime.MissingCertificateException;
import org.icemail.smime.PasswordCancelException;

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


/**
 * QuickViewer allows the contents of a message to be viewed.
 * The message contents are determined, displaying the headers and body in
 * separate panes. If there are attachments (multi-part messages) then an
 * additional pane is added which contains a button for each part.
 * 
 * FIX ME; at this time, QuickViewer is closely tied to MainPanel due to
 * the interworkings of buttons and actions. These need to be separate in
 * future versions.
 */
public class QuickViewer
  extends JPanel
  implements ActionDistributor
{
  private static final int Debug_ = Package.DEBUG ? Package.getLevel( "QuickViewer" ) : 0;

  private static ImageIcon AttUnknownIcon = null;

  private boolean         showFullHeaders_ = false;
  private boolean         parseSMimeMessages_ = true;
  private int             maxBodyPartSize_ = (48 * 1024);

  private JPanel          attachPane_ = null;
  private JEditorPane     editorPane_ = null;
  private JPanel          theAttachPane_ = null;
  private UndoManager     undo_ = null;

  private Message         outerMessage_ = null;
  private Part            message_ = null;
  private JScrollPane     editorScroller_ = null;
  private JScrollPane     attachScroller_ = null;
  private JSplitPane      bodySplit_ = null;
  private int             bodyDivLoc_ = 5;

  private Component       body_ = null;
  private Part            popupAttachPart_ = null;
  private JPopupMenu      popupMenu_ = null;

  private JTextArea       hdrTextArea_ = null;
  private JScrollPane     hdrScroller_ = null;
  private JSplitPane      hdrSplit_ = null;

  private Action          signedAction_ = null;
  private Action          envelopedAction_ = null;

  private IActionListener actionListener_ = new IActionListener();


  static {
    try {
      Image iconImg =
        AWTUtilities.getImageResource( "/org/icemail/mail/images/attunknown.gif" );
      QuickViewer.AttUnknownIcon = new ImageIcon( iconImg );
    } catch ( Exception ex ) {
      System.err.println( "QuickViewer.static: Error " + "loading icon: " + ex.getMessage() );
    }
  }

  public
  QuickViewer() {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer()" );
    }
    
    parseSMimeMessages_ = ( ICEMail.getSMIMELibrary() != null );

    setLayout( new BorderLayout() );

    int row = 0;

    hdrTextArea_ = new JTextArea( "" );
    hdrTextArea_.setBorder( new EmptyBorder( 1, 3, 1, 3 ) );
    hdrTextArea_.setEditable( false );

    hdrScroller_ = new JScrollPane();
    hdrScroller_.getViewport().add( hdrTextArea_ );
    hdrScroller_.setMinimumSize( new Dimension(50, 15) );
    hdrScroller_.setPreferredSize( new Dimension(600, 78) );

    editorScroller_ = new JScrollPane();
    editorScroller_.getViewport().add( new JTextArea() );
    editorScroller_.setMinimumSize( new Dimension(50, 75) );
    editorScroller_.setPreferredSize( new Dimension(400, 400) );

    theAttachPane_ = new JPanel();
    theAttachPane_.setLayout( new BoxLayout( theAttachPane_, BoxLayout.Y_AXIS ) );

    attachScroller_ = new JScrollPane();
    attachScroller_.getViewport().add( theAttachPane_ );
    attachScroller_.setMinimumSize( new Dimension(5, 50) );

    bodySplit_ = new JSplitPane( JSplitPane.HORIZONTAL_SPLIT,
                                     editorScroller_, attachScroller_ );

    bodySplit_.setMinimumSize( new Dimension(50, 50) );
    bodySplit_.setContinuousLayout( true );
    bodySplit_.setDividerSize( 3 );

    bodySplit_.setDividerLocation( bodyDivLoc_ );

    hdrSplit_ = new JSplitPane( JSplitPane.VERTICAL_SPLIT,
                                    hdrScroller_, editorScroller_ );
    
    hdrSplit_.setMinimumSize( new Dimension(50, 50) );
    hdrSplit_.setContinuousLayout( true );
    hdrSplit_.setDividerSize( 3 );

    add( hdrSplit_, BorderLayout.CENTER );

    popupMenu_ = ComponentFactory.getPopupMenuAndItems( ICEMail.getBundle(),
                                                            "QuickViewer.attachment",
                                                            actionListener_ );

    maxBodyPartSize_ = UserProperties.getProperty( "maxBodyPartSize", (128 * 1024) );

    Image img = null;

    try {
      img = AWTUtilities.getImageResource( "/org/icemail/mail/images/signed.gif" );
    } catch ( IOException ex ) {
      img = null;
    }

    signedAction_ = new AbstractAction()
                        {
                          public void actionPerformed( ActionEvent event ) {
                            SwingUtilities.invokeLater(
                                new Runnable()
                                {
                                  public void run() { showSigners(); }
                                }
                              );
                            }
                        };

    signedAction_.setEnabled( false );
    signedAction_.putValue( Action.SMALL_ICON, new ImageIcon( img ) );

    try {
      img = AWTUtilities.getImageResource( "/org/icemail/mail/images/enveloped.gif" );
    } catch ( IOException ex ) {
      img = null;
    }

    envelopedAction_ = new AbstractAction()
                           {
                             public void actionPerformed( ActionEvent event )
                             {
                               SwingUtilities.invokeLater(
                                   new Runnable()
                                   {
                                     public void run() { showEnvelope(); }
                                   }
                                 );
                             }
                           };

    envelopedAction_.setEnabled( false );
    envelopedAction_.putValue( Action.SMALL_ICON, new ImageIcon( img ) );

    setMinimumSize( new Dimension( 50, 50 ) );
    setPreferredSize( new Dimension( 600, 250 ) );
  }

//............................................................
// Accessors

  public Action
  getSignedAction() {
    return signedAction_;
  }

  public Action
  getEnvelopedAction() {
    return envelopedAction_;
  }

  public String
  getTextSelection() {
    String result = "";

    if ( editorPane_ != null ) {
      result = editorPane_.getSelectedText();
    }

    return result;
  }

//............................................................
// Mutators

  public void
  setFullHeaders( boolean full ) {
    showFullHeaders_ = full;
    getHeaderComponent();
    hdrScroller_.revalidate();
  }

  public void
  setParseSMimeMessages( boolean parse ) {
    parseSMimeMessages_ = parse;
    setMessage( outerMessage_ );
  }

  /**
   * sets the current message to be displayed in the viewer
   */
  public void
  setMessage( Message msg ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.setMessage(m)" );
    }

  // The outerMessage ONLY differs from the message when the
  // message being displayed is signed or encrypted. In this
  // case, the outerMessage is the PKCS SMIME message, while
  // message is the inner "wrapped MIME" message
    outerMessage_ = msg;

    message_ = outerMessage_;

    int divLoc = 50;

    int hdrDivLoc = hdrSplit_.getDividerLocation();

    try {
      if ( outerMessage_ != null ) {
        Folder f = outerMessage_.getFolder();

        MailUtilities.setFolderOpenAndReady( f, Folder.READ_WRITE );
      }
    } catch ( MessagingException ex ) {
      // UNDONE what do upon failure???
    }

    boolean wasSplit = attachPane_ != null;

    if ( wasSplit ) {
      bodyDivLoc_ = bodySplit_.getDividerLocation();
    }

    undo_ = new UndoManager();
    editorPane_ = null;
    attachPane_ = null;

    getHeaderComponent();

    if ( parseSMimeMessages_ && outerMessage_ instanceof MimeMessage ) {
      ICEMail.getSMIMELibrary().clearState();

      try {
        if ( ICEMail.getSMIMELibrary().isSMimeMessage( outerMessage_ ) ) {
          message_ = ICEMail.getSMIMELibrary().getContentMessage( ICEMail.getDefaultSession(),
                                                                      outerMessage_ );
        }
      } catch ( MissingCertificateException ex ) {
        ComponentFactory.showDialog( ICEMail.getBundle(), "QuickViewer.SMimeError",
                                     0, JOptionPane.WARNING_MESSAGE, null );

        message_ = outerMessage_;
      } catch ( PasswordCancelException ex ) {
        ComponentFactory.showDialog( ICEMail.getBundle(), "QuickViewer.SMimeError",
                                     0, JOptionPane.WARNING_MESSAGE, null );

        message_ = outerMessage_;
      } catch ( MessagingException ex ) {
        message_ = outerMessage_;
      }

      signedAction_.setEnabled( ICEMail.getSMIMELibrary().isSigned( message_ ) );
      envelopedAction_.setEnabled( ICEMail.getSMIMELibrary().isEnveloped( message_ ) );
    } else {
      signedAction_.setEnabled( false );
      envelopedAction_.setEnabled( false );
    }

    parseMessagePart( message_ );

    if ( editorPane_ == null ) {
      editorPane_ = new JTextPane( new DefaultStyledDocument() );
    }

    editorScroller_.getViewport().removeAll();
    editorScroller_.getViewport().add( editorPane_ );
    editorScroller_.revalidate();

    if ( attachPane_ == null ) {
      body_ = editorScroller_;   
    } else {
      bodySplit_.setLeftComponent( editorScroller_ );
      bodySplit_.setRightComponent( attachScroller_ );

      bodySplit_.invalidate();
      bodySplit_.validate();

      body_ = bodySplit_;
    }

    editorPane_.setCaretPosition( 0 );
    editorPane_.moveCaretPosition( 0 );

    hdrScroller_.getViewport().removeAll();
    hdrScroller_.getViewport().add( hdrTextArea_ );
    hdrScroller_.revalidate();

    hdrSplit_.setBottomComponent( body_ );
    hdrSplit_.setDividerLocation( hdrDivLoc );
    hdrSplit_.invalidate();
    hdrSplit_.validate();

    if ( attachPane_ != null ) {
      bodySplit_.setDividerLocation( bodyDivLoc_ );
      attachPane_.invalidate();