java HTML文件文档编辑器 使用 JTextPane

 java HTML文件文档编辑器 使用 JTextPane 
/* HTMLDocumentEditor.java
* @author: Charles Bell
* @version: May 27, 2002
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.undo.*;
/**HTML文件文档编辑器*/
public class HTMLDocumentEditor extends JFrame implements ActionListener
{
 /** 声明一个网页文档对象变量*/
 private HTMLDocument document;
 /** 创建一个文本编辑板*/
 private JTextPane textPane = new JTextPane();
 private boolean debug = false;
 /** 声明一个文件对象变量*/
 private File currentFile;
 
 /** 侦听在当前文档上的编辑器 */
 protected UndoableEditListener undoHandler = new UndoHandler();
 
 /** 添加撤消管理器 */
 protected UndoManager undo = new UndoManager();
 
 /** 添加撤消侦听器*/
 private UndoAction undoAction = new UndoAction();
 /** 添加恢复侦听器*/
 private RedoAction redoAction = new RedoAction();
 
 /** 添加剪切侦听器*/
 private Action cutAction = new DefaultEditorKit.CutAction();
 /** 添加复制侦听器*/
 private Action copyAction = new DefaultEditorKit.CopyAction();
 /** 添加粘贴侦听器*/
 private Action pasteAction = new DefaultEditorKit.PasteAction();
 
 /** 添加加粗侦听器*/
 private Action boldAction = new StyledEditorKit.BoldAction();
 /** 添加加下划线侦听器*/
 private Action underlineAction = new StyledEditorKit.UnderlineAction();
 /** 添加倾斜侦听器*/
 private Action italicAction = new StyledEditorKit.ItalicAction();
 
 private Action insertBreakAction = new DefaultEditorKit.InsertBreakAction();
 private HTMLEditorKit.InsertHTMLTextAction unorderedListAction = new HTMLEditorKit.InsertHTMLTextAction("Bullets", "<