quickviewer.java

一个用java写的mail.里面的代码值得我们去研究！学习。

    JDialog dlg = new PropertiesDialog( null, part, false );
    dlg.show();
  }

  private void
  viewMessagePart( Part part ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.viewMessagePart(p)" );
    }

    String action = ICEMail.getBundle().getString( "QuickViewer.viewing" );

    if ( ! okLargeAttachment( part, action ) )
      return;

    MainFrame.getInstance().setWaitCursor();

    try {
      DataHandler dh = part.getDataHandler();

      Object viewer = getMailcapViewer( dh );

      if ( viewer != null ) {
        if ( viewer instanceof Component ) {
          String title = MessageUtilities.getFileName( part );

          if ( title == null || title.length() < 1 )
            title = "Attachment";

          ComponentFrame frame =
            new ComponentFrame( (Component)viewer, title, dh.getDataSource() );

          frame.show();
        }
      }
    } catch ( MessagingException ex ) {
      ex.printStackTrace( System.err );
    }

    MainFrame.getInstance().resetCursor();
  }

  private void
  viewMessagePartAs( Part part ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.viewMessagePartAs(p)" );
    }

    String action = ICEMail.getBundle().getString( "QuickViewer.viewing" );

    if ( ! okLargeAttachment( part, action ) )
      return;

    try {
      DataHandler dh = part.getDataHandler();

      ViewAsDialog dlg = new ViewAsDialog( (Frame) getTopLevelAncestor(), part );

      dlg.show();

      String viewAsType = dlg.getViewAsType();

      if ( viewAsType != null ) {
        ViewAsDataSource newSource = new ViewAsDataSource( viewAsType, dh );

        DataHandler newDh = new DataHandler( newSource );

        Object viewer = getMailcapViewer( newDh );

        if ( viewer != null ) {
          if ( viewer instanceof Component ) {
            ComponentFrame frame =
              new ComponentFrame( (Component)viewer, "Attachment", newSource );

            frame.show();
          }
        }
      }
    } catch ( MessagingException ex ) {
      ex.printStackTrace( System.err );
    } catch ( MimeTypeParseException ex ) {
      ex.printStackTrace( System.err );
    }
  }

  private Object
  getMailcapViewer( DataHandler dh ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.getMailcapViewer(d): " + dh );
    }

    Object bean = null;
    String xtext = null;

    CommandInfo ci = dh.getCommand( "view" );

    if ( Package.DEBUG && Debug_ > 0 ) {
      System.out.println( "QuickViewer.getMailcapViewer(d): CommandInfo - " + ci );
    }

    if ( ci == null ) {
      String contentType = dh.getContentType();

      try {
        MimeType mime = new MimeType( contentType );
        contentType = mime.getBaseType();
      } catch ( MimeTypeParseException ex ) {
      }

      Object[] xargs = new Object[1];
      xargs[0] = contentType;
      xtext = ICEMail.getBundle().getFormatString( "QuickViewer.noviewcommand", xargs );
    } else {
      try {
        bean = dh.getBean( ci );
      } catch ( Exception ex ) {
        if ( Package.DEBUG && Debug_ > 0 ) {
          System.out.println( "QuickViewer.getMailcapViewer(d): getBean(ci) failed - " + ex );
        }
        bean = null;
      }
      if ( bean == null ) {
        Object[] xargs = new Object[2];
        xargs[0] = ci.getCommandName();
        xargs[1] = ci.getCommandClass();
        xtext = ICEMail.getBundle().getFormatString( "QuickViewer.noviewer", xargs );
      }
    }

    if ( bean == null ) {
      bean = new JTextArea( xtext );
    }
    return bean;
  }

  private ImageIcon
  getMailcapIcon( DataHandler dh ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.getMailcapIcon(d): " + dh );
    }

    ImageIcon result = QuickViewer.AttUnknownIcon;

    CommandInfo ci = dh.getCommand( "icon" );

    if ( ci != null ) {
      result = (ImageIcon) dh.getBean( ci );
    }

    return result;
  }

  private void
  saveMessagePartToFile( Part part ) {
    if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
      System.out.println( "QuickViewer.saveMessagePartToFile(p)" );
    }

    String action = ICEMail.getBundle().getString( "QuickViewer.saving" );

    if ( ! okLargeAttachment( part, action ) )
      return;

    try {
      String fileName = MessageUtilities.getFileName( part );

      FileDialog dialog =
          new FileDialog( (Frame)getTopLevelAncestor(),
                          ICEMail.getBundle().getString( "QuickViewer.SaveAttachment" ),
                          FileDialog.SAVE );

      dialog.setFile( fileName );

      dialog.show();

      fileName = dialog.getFile();
      String dirName = dialog.getDirectory();

      if ( fileName != null && dirName != null ) {
        MainFrame.getInstance().setWaitCursor();

        InputStream is = null;
        FileOutputStream os = null;

        File outputFile = new File( dirName, fileName );

        try {
          is = part.getInputStream();
          os = new FileOutputStream( outputFile );

          byte[] buf = new byte[ 16 * 1024 ];

          for ( ; ; ) {
            int bytes = is.read( buf );

            if ( bytes < 0 )
              break;

            if ( bytes > 0 )
              os.write( buf, 0, bytes );
          }

          is.close();
          os.close();
        } catch ( IOException ex ) {
          ex.printStackTrace( System.err );

          try {
            if ( is != null ) is.close();
            if ( os != null ) os.close();
          } catch ( IOException iox ) {
          }

          Object[] xargs = new Object[2];
          xargs[0] = new String( "IOException" );
          xargs[1] = ex.getMessage();
          ComponentFactory.showDialog( ICEMail.getBundle(), "QuickViewer.SaveError",
                                       0, JOptionPane.ERROR_MESSAGE, xargs );
        }

        MainFrame.getInstance().resetCursor();
      }
    } catch ( MessagingException ex ) {
      Object[] xargs = new Object[2];
      xargs[0] = new String( "MessagingException" );
      xargs[1] = ex.getMessage();
      ComponentFactory.showDialog( ICEMail.getBundle(), "QuickViewer.SaveError",
                                   0, JOptionPane.ERROR_MESSAGE, xargs );
    }
  }

  private boolean
  okLargeAttachment( Part part, String action ) {
    boolean result = true;

    try {
      int partSize = part.getSize();
      if ( partSize > (2048 * 1024) ) {
        double megs = ((double)partSize) / ( 1024.0 * 1024.0 );

        DecimalFormat fmt = new DecimalFormat( "#,##0.00" );

        Object[] xargs = new Object[2];
        xargs[0] = fmt.format( megs );
        xargs[1] = action;
        int option =
          ComponentFactory.showDialog( ICEMail.getBundle(), "QuickViewer.LargeAttach",
                                       0, JOptionPane.QUESTION_MESSAGE, xargs );

        if ( option == JOptionPane.YES_OPTION )
          result = true;
        else
          result = false;
      }
    } catch ( MessagingException ex ) {
    }

    return result;
  }

//............................................................
// I N N E R    C L A S S E S
//............................................................

  private class IActionListener
    implements ActionListener
  {
    /**
     * Invoked when an action occurs.
     * <p>
     * Implementation of java.awt.event.ActionListener.actionPerformed()
     *
     * @param event the action event that occured
     */
    public void
    actionPerformed( ActionEvent event ) {
      String command = event.getActionCommand();

      if ( Package.DEBUG && Package.isTraceable( "QuickViewer" ) ) {
        System.out.println( "IActionListener.actionPerformed(ae): " + command );
      }      

      if ( command.startsWith( "POPUP:" ) ) {
        if ( command.equals( "POPUP:SAVE" ) ) {
          saveMessagePartToFile( popupAttachPart_ );
        } else if ( command.equals( "POPUP:VIEW" ) ) {
          viewMessagePart( popupAttachPart_ );
        } else if ( command.equals( "POPUP:VIEWAS" ) ) {
          viewMessagePartAs( popupAttachPart_ );
        } else if ( command.equals( "POPUP:PROPS" ) ) {
          viewPartProperties( popupAttachPart_ );
        }
      } else if ( command.equals( "CUT" ) ) {
        if ( editorPane_ != null ) {
          editorPane_.cut();
        }
      } else if ( command.equals( "COPY" ) ) {
        if ( editorPane_ != null ) {
          editorPane_.copy();
        }
      } else if ( command.equals( "PASTE" ) ) {
        if ( editorPane_ != null ) {
          editorPane_.paste();
        }
      } else if ( command.equals( "UNDO" ) ) {
        if ( undo_ != null && undo_.canUndoOrRedo() ) {
          undo_.undoOrRedo();
        }
      }
    }
  }

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

  private class SaveAttachementAction
    implements ActionListener
  {
    Part i_part_;

    public
    SaveAttachementAction( Part part ) {
      i_part_ = part;
    }

    public void
    actionPerformed( ActionEvent e ) {
      saveMessagePartToFile( i_part_ );
    }
  }

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

  private class ViewAttachementAction
    implements ActionListener
  {
    Part i_part_;

    public
    ViewAttachementAction( Part part ) {
      i_part_ = part;
    }

    public void
    actionPerformed( ActionEvent e ) {
      viewMessagePart( i_part_ );
    }
  }

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

  private class IMouseAdapter
    extends MouseAdapter
  {
    private Component  i_parent_ = null;
    private JPopupMenu i_popupmenu_ = null;
    private Part       i_part_ = null;
    private boolean    i_isPopupTrigger_ = false;

    public
    IMouseAdapter( Component parent, JPopupMenu menu, Part bodyPart ) {
      super();
      i_parent_ = parent;
      i_popupmenu_ = menu;
      i_part_ = bodyPart;
    }

    public void
    mousePressed( MouseEvent event ) {
      i_isPopupTrigger_ = false;

      if ( event.isPopupTrigger() ) {
        i_isPopupTrigger_ = true;
        popupAttachPart_ = i_part_;
        i_popupmenu_.show( i_parent_, event.getX(), event.getY() );
      }
    }

    public void
    mouseReleased( MouseEvent event ) {
      if ( i_isPopupTrigger_ )
        return;

      if ( event.isPopupTrigger() ) {
        i_isPopupTrigger_ = true;
        popupAttachPart_ = i_part_;
        i_popupmenu_.show( i_parent_, event.getX(), event.getY() );
      }
    }

    public void
    mouseClicked( MouseEvent event ) {
      if ( i_isPopupTrigger_ ) {
        i_isPopupTrigger_ = false;
      }
    }
  }

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

  private class IHyperlinkListener
    implements HyperlinkListener
  {
    public void
    hyperlinkUpdate( HyperlinkEvent event ) {
      HyperlinkEvent.EventType type = event.getEventType();
      Object source = event.getSource();
      URL url = event.getURL();

      if ( type == HyperlinkEvent.EventType.ACTIVATED ) {
        MainFrame.getInstance().setWaitCursor();

        HotJavaMailBrowser.setBrowserDocumentURL( url );

        MainFrame.getInstance().resetCursor();
      } else if ( type == HyperlinkEvent.EventType.ENTERED ) {
        // This and EXITED do not work (why?)! When they
        // do, we will probably want to toggle the cursor.
      } else if ( type == HyperlinkEvent.EventType.EXITED ) {
      }
    }
  }

}