certificateinfopanel.java

一个用java写的mail.里面的代码值得我们去研究！学习。

                              GridBagConstraints.EAST, 0, row, 1, 1, 0.0, 0.0 );

      this.after = new JLabel( " " );
      this.after.setHorizontalAlignment( JLabel.LEFT );
      this.after.setForeground( Color.black );
      this.after.setBorder( commonBorder );

      AWTUtilities.constrain( this, this.after, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

      lbl = new JLabel( "Algorithm:" );
      lbl.setForeground( Color.black );
      lbl.setBorder( commonBorder );

      AWTUtilities.constrain( this, lbl, GridBagConstraints.NONE,
                              GridBagConstraints.EAST, 0, row, 1, 1, 0.0, 0.0,
                              new Insets( 23, 0, 0, 0 ) );

      this.algorithm = new JLabel( " " );
      this.algorithm.setHorizontalAlignment( JLabel.LEFT );
      this.algorithm.setForeground( Color.black );
      this.algorithm.setBorder( commonBorder );

      AWTUtilities.constrain( this, this.algorithm, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0,
                              new Insets( 23, 0, 0, 0 ) );

      lbl = new JLabel( "Serial Number:" );
      lbl.setForeground( Color.black );
      lbl.setBorder( commonBorder );

      AWTUtilities.constrain( this, lbl, GridBagConstraints.NONE,
                              GridBagConstraints.EAST, 0, row, 1, 1, 0.0, 0.0 );

      this.serial = new JLabel( " " );
      this.serial.setHorizontalAlignment( JLabel.LEFT );
      this.serial.setForeground( Color.black );
      this.serial.setBorder( commonBorder );

      AWTUtilities.constrain( this, this.serial, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

      lbl = new JLabel( "Fingerprint:" );
      lbl.setForeground( Color.black );
      lbl.setBorder( commonBorder );

      AWTUtilities.constrain( this, lbl, GridBagConstraints.NONE,
                              GridBagConstraints.EAST, 0, row, 1, 1, 0.0, 0.0 );

      this.finger = new JLabel( " " );
      this.finger.setHorizontalAlignment( JLabel.LEFT );
      this.finger.setForeground( Color.black );
      this.finger.setBorder( commonBorder );

      AWTUtilities.constrain( this, this.finger, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, row++, 1, 1, 1.0, 0.0 );

      AWTUtilities.constrain( this, new JPanel(), GridBagConstraints.BOTH,
                              GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 1.0 );
    }

    public void
    setCurrentCertificate( X509Certificate cert ) {
      Name nm = (Name) cert.getSubjectDN();
      String fName = nm.getRDN( ObjectID.friendlyName );
      if ( fName == null || fName.length() == 0 )
        fName = nm.getRDN( ObjectID.commonName );

      if ( fName == null || fName.length() == 0 )
        fName = nm.getRDN( ObjectID.organization );

      if ( fName == null || fName.length() == 0 )
        fName = nm.getRDN( ObjectID.organizationalUnit );

      if ( fName == null || fName.length() == 0 )
        fName = "Not available";

      this.friendlyName.setText( fName );

      AlgorithmID signAlg = cert.getSignatureAlgorithm();
      this.algorithm.setText( signAlg.getName() );

      SimpleDateFormat dFmt = new SimpleDateFormat( "EEE, dd MM yyyy HH:mm:ss" );

      Date notBefore = cert.getNotBefore();
      Date notAfter = cert.getNotAfter();
      String befStr = dFmt.format( notBefore );
      String aftStr = dFmt.format( notAfter );
      this.before.setText( befStr );
      this.after.setText( aftStr );

      BigInteger serNum = cert.getSerialNumber();
      this.serial.setText( serNum.toString() );

      char[] hex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                     'A', 'B', 'C', 'D', 'E', 'F' };

      byte[] fBytes = cert.getFingerprint();
      StringBuffer buf = new StringBuffer();
      for ( int i = 0 ; i < fBytes.length ; ++i ) {
        byte b = fBytes[i];
        
        int low = ( b & 15 );
        int high = ( (b >> 4) & 15 );

        buf.append( hex[high] );
        buf.append( hex[low] );
      }

      this.finger.setText( buf.toString() );
    }
  }

  private class CertDescriptionPanel
    extends JPanel
  {
    private JTextArea    text;
    private JScrollPane  scroller;

    public
    CertDescriptionPanel() {
      super();

      this.setLayout( new BorderLayout() );
      this.text = new JTextArea();
      this.scroller = new JScrollPane( text );
      this.add( BorderLayout.CENTER, this.scroller );
    }

    public void
    setCurrentCertificate( X509Certificate cert ) {
      if ( cert == null ) {
        this.text.setText( "" );
      } else {
        this.text.setText( cert.toString( true ) );
      }
    }
  }

  private class CertImportPanel
    extends JPanel
  {
    private JButton  btn;
    private JLabel   email;


    public
    CertImportPanel() {
      super();

      this.setLayout( new GridBagLayout() );

      int row = 0;

      JTextArea help = new JTextArea();

      help.setText(
          "Clicking the import button will add the selected\n"
        + "certificate into your list of certificates. This will\n"
        + "allow you to send encrypted email to the email\n"
        + "address shown with the certificate."
        );

      help.setOpaque( false );
      help.setEditable( false );

      this.btn = new JButton( "Import Certificate" );
      btn.setActionCommand( "IMPORTCERT" );
      btn.addActionListener( CertificateInfoPanel.this );
      btn.setEnabled( false );

      this.email = new JLabel( "No certificate is selected." );
      this.email.setForeground( Color.black );
      this.email.setHorizontalAlignment( SwingConstants.CENTER );

      JPanel pan = new JPanel();
      pan.setLayout( new BorderLayout() );
      pan.add( BorderLayout.CENTER, help );

      AWTUtilities.constrain( this, pan, GridBagConstraints.NONE,
                              GridBagConstraints.SOUTH, 0, 0, 1, 1, 1.0, 0.4 );

      AWTUtilities.constrain( this, this.email, GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.CENTER, 0, 1, 1, 1, 1.0, 0.0,
                              new Insets( 25, 1, 10, 1 ) );

      AWTUtilities.constrain( this, this.btn, GridBagConstraints.NONE,
                              GridBagConstraints.NORTH, 0, 2, 1, 1, 1.0, 0.6 );
    }

    public void
    setCurrentCertificate( X509Certificate cert ) {
      if ( cert == null ) {
        this.email.setText( "No certificate is selected." );
      } else {
        Name nm = (Name) cert.getSubjectDN();

        String emailStr = nm.getRDN( ObjectID.emailAddress );

        if ( emailStr != null && emailStr.length() > 0 ) {
          this.email.setText( emailStr );
          this.btn.setEnabled( true );
        } else {
          this.email.setText( "Selected certificate has no email address." );
          this.btn.setEnabled( false );
        }
      }
    }
  }

  private class CertRDNPanel
    extends JPanel
  {
    private JList        list;
    private JScrollPane  scroller;

    public
    CertRDNPanel() {
      super();

      this.setLayout( new BorderLayout() );

      this.list = new JList();

      this.scroller = new JScrollPane( this.list );

      this.add( BorderLayout.CENTER, this.scroller );
    }

    public void
    setCurrentCertificate( X509Certificate cert ) {
      Name nm = (Name) cert.getSubjectDN();

      Vector lv = new Vector();

      Enumeration renum = nm.elements();
      for ( ; renum.hasMoreElements() ; ) {
        RDN r = (RDN) renum.nextElement();

        Enumeration aEnum = r.elements();
        for ( ; aEnum.hasMoreElements() ; ) {
          AVA a = (AVA) aEnum.nextElement();

          String val = (String) a.getValue();
          String name = a.getType().getShortName();
          lv.addElement( name + "=" + val );
        }
      }

      this.list.setListData( lv );
    }
  }

}