与Java相伴的日子
相识，相知，相恋，到相守......我的日子因你的到来而充实,我的日子因你的存在而多姿！
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用Swing 组件编写的记事本

       以下是我用Swing 组件编写的记事本，功能是模仿微软的，使用了观感，自我觉得界面比Win的记事本更为好看（臭屁一下吧）。除了没有做字体选择之外，其他功能基本都有了吧。

/**
 *Author: Zhang Zhijian 
 *Mail: qnjian@163.com
 *Created  on 2005-5-22
 * 声明：本程序版权归作者所有，允许以学习目的的传播，
 * 但必须保留本作者署名及源程序的完整！
  */

package  com.qnjian.notpad;

 import  javax.swing. * ;
 import  java.io. * ;
 import  java.awt. * ;
 import  java.awt.event. * ;

 public   class  NotePad  extends  JFrame  implements  ActionListener,ItemListener
 {
     boolean  haveCreated = false ;
    File file = null ;
    String strtext = "" ;
     int  findIndex = 0 ;
    String findStr;
    
      JMenuBar menubar    =   new  JMenuBar();
    JMenu meFile        =   new  JMenu( " 文件 " );
    JMenu meEdit        =   new  JMenu( " 编辑 " );
    JMenu meStyle       =   new  JMenu( " 风格 " );
    JMenu meHelp        =   new  JMenu( " 帮助 " );
        
    JMenuItem miCreate  =   new  JMenuItem( " 新建 " );    
    JMenuItem miOpen    =   new  JMenuItem( " 打开 " );    
    JMenuItem miSave    =   new  JMenuItem( " 保存 " );    
    JMenuItem miSaveAs  =   new  JMenuItem( " 另存为 " );    
    JMenuItem miExit    =   new  JMenuItem( " 退出 " );    
    
    JMenuItem miUndo    =   new  JMenuItem( " 撤消 " );    
    JMenuItem miCut     =   new  JMenuItem( " 剪切 " );    
    JMenuItem miCopy    =   new  JMenuItem( " 复制 " );    
    JMenuItem miPaste   =   new  JMenuItem( " 粘贴 " );    
    JMenuItem miDelete  =   new  JMenuItem( " 删除 " );    
    JMenuItem miFind    =   new  JMenuItem( " 查找 " );    
    JMenuItem miNext    =   new  JMenuItem( " 查找下一个 " );    
    JMenuItem miReplace =   new  JMenuItem( " 替换 " );
    
     // 右键弹出菜单项
    JMenuItem pmUndo    =   new  JMenuItem( " 撤消 " );
    JMenuItem pmCut     =   new  JMenuItem( " 剪切 " );        
    JMenuItem pmCopy    =   new  JMenuItem( " 复制 " );        
    JMenuItem pmPaste   =   new  JMenuItem( " 粘贴 " );        
    JMenuItem pmDelete  =   new  JMenuItem( " 删除 " );
    
    JCheckBoxMenuItem miNewLine =   new  JCheckBoxMenuItem( " 自动换行 " );
    JMenu smLookFeel    =   new  JMenu( " 观感 " );
    JMenuItem metal     =   new  JMenuItem( " Metal " );
    JMenuItem motif     =   new  JMenuItem( " Motif " );
    JMenuItem windows   =   new  JMenuItem( " Windows " );
        
    JMenuItem miAbout   =   new  JMenuItem( " 关于 " );
    
    JPopupMenu popupMenu;    
    JTextArea text      =   new  JTextArea();

        
     public  NotePad()
     {
         super ( " 我的记事本 " );
         // 为便于区分事件源，设定名字
        miCreate.setActionCommand( " create " );
        miOpen.setActionCommand( " open " );
        miSave.setActionCommand( " save " );
        miSaveAs.setActionCommand( " saveAs " );
        miExit.setActionCommand( " exit " );        
        
        miUndo.setActionCommand( " undo " );
        miCut.setActionCommand( " cut " );
        miCopy.setActionCommand( " copy " );
        miPaste.setActionCommand( " paste " );
        miDelete.setActionCommand( " delete " );
        miFind.setActionCommand( " find " );
        miNext.setActionCommand( " next " );
        miReplace.setActionCommand( " replace " );
        
        miNewLine.setActionCommand( " newLine " );    
        miAbout.setActionCommand( " about " );
        
        pmUndo.setActionCommand( " undo " );
        pmCut.setActionCommand( " cut " );
        pmCopy.setActionCommand( " copy " );
        pmPaste.setActionCommand( " paste " );
        pmDelete.setActionCommand( " delete " );
        
         this .setSize( 500 , 500 );
         this .setLocation( 300 , 150 );
         this .setJMenuBar(menubar);
        
        meFile.setFont( new  Font( " 宋体 " ,Font.BOLD, 15 ));
        meEdit.setFont( new  Font( " 宋体 " ,Font.BOLD, 15 ));
        meStyle.setFont( new  Font( " 宋体 " ,Font.BOLD, 15 ));
        meHelp.setFont( new  Font( " 宋体 " ,Font.BOLD, 15 ));
        
        menubar.add(meFile);
        menubar.add(meEdit);
        menubar.add(meStyle);
        menubar.add(meHelp);
        
        meFile.add(miCreate);
        meFile.add(miOpen);
        meFile.add(miSave);
        meFile.add(miSaveAs);
        meFile.addSeparator();
        meFile.add(miExit);    
        
        meEdit.add(miUndo);
        meEdit.addSeparator();        
        meEdit.add(miCut);
        meEdit.add(miCopy);
        meEdit.add(miPaste);
        meEdit.add(miDelete);
        meEdit.addSeparator();
        meEdit.add(miFind);
        meEdit.add(miNext);
        meEdit.addSeparator();
        meEdit.add(miReplace);
        
        meStyle.add(miNewLine);
        meStyle.add(smLookFeel);
        smLookFeel.add(metal);
        smLookFeel.add(motif);
        smLookFeel.add(windows);
        
        meHelp.add(miAbout);
         // 添加到右键弹出菜单
        popupMenu = new  JPopupMenu();
        popupMenu.add(pmUndo);
        popupMenu.addSeparator();
        popupMenu.add(pmCut);
        popupMenu.add(pmCopy);
        popupMenu.add(pmPaste);
        popupMenu.add(pmDelete);
         // 添加按钮事件监听
        meHelp.addActionListener( this );
        miCreate.addActionListener( this );
        miOpen.addActionListener( this );
        miSave.addActionListener( this );
        miSaveAs.addActionListener( this );
        miExit.addActionListener( this );
        
        miUndo.addActionListener( this );
        miCut.addActionListener( this );
        miCopy.addActionListener( this );
        miPaste.addActionListener( this );
        miDelete.addActionListener( this );
        miFind.addActionListener( this );
        miNext.addActionListener( this );
        miReplace.addActionListener( this );
        
        miNewLine.addItemListener( this );                
        miAbout.addActionListener( this );
        metal.addActionListener( this );
        motif.addActionListener( this );
        windows.addActionListener( this );
        
         // 添加右键按钮事件监听器
        pmUndo.addActionListener( this );
        pmCut.addActionListener( this );
        pmCopy.addActionListener( this );
        pmPaste.addActionListener( this );
        pmDelete.addActionListener( this );
        
         // 文本区内容没有选中时某些按钮不可用
        miCut.setEnabled( false );
        miCopy.setEnabled( false );
        miDelete.setEnabled( false );
        
        pmCut.setEnabled( false );
        pmCopy.setEnabled( false );
        pmDelete.setEnabled( false );
            
        JScrollPane scrollPane  = new  JScrollPane(text);    
        getContentPane().add(scrollPane, " Center " );
        text.setFont( new  Font( " Fixedsys " ,Font.TRUETYPE_FONT, 15 ));                
        setVisible( true );
        
         // 添加键盘输入监听器
        text.addFocusListener( new  MyFocusAdapter());
         // 添加鼠标监听器，用于激活右键弹出菜单
        text.addMouseListener( new  MouseAdapter()
             {
                 public   void  mouseReleased(MouseEvent e)
                 {
                     if (e.isPopupTrigger())
                     {
                        popupMenu.show(e.getComponent(),e.getX(),e.getY());
                    }
                }
            } );
         // 添加窗口关闭监听器    
        addWindowListener( new  WindowAdapter()
             {
                 public   void  windowClosing(WindowEvent e)
                 { // 询问是否保存时选择撤消
                     int  i;
                     if ( (i = askForSave()) == 3 )
                     {
                         return ;    
                    }
                    System.exit( 0 );                    
                }
            } );        
            
    
    }
////////////////////////// Methods //////////////////////////////////// /
     // 打开
     public   void  open()
     {        
        JFileChooser jc  = new  JFileChooser();
        jc.showOpenDialog( this );
        File f  =  jc.getSelectedFile();
         if (f == null ) // 没有选择文件则退出
         {
             return ;
        }
        file = f; // file 是File类的对象,为本类属性,在保存当前内容时用
         this .setTitle(f.getName() + " --记事本 " );        
        FileReader fr = null ;
         int  len = ( int )f.length();
         char [] ch = new   char [len];
         int  num = 0 ;
         try
         {
            fr =   new  FileReader(f);
             while (fr.ready())
             {
                num += fr.read(ch,num,len - num);
            }
             // 保存在属性strtext中，为了便于撤消恢复及监视内容是否改变            
            strtext = new  String(ch, 0 ,num);
            haveCreated = false ;
            text.setText(strtext);
        }
         catch (Exception e)
         {
            JOptionPane.showMessageDialog( this , " 出错:  " + e.getMessage());
        }
         finally
         {
             try
             {
                fr.close();                
            }
             catch (IOException e)
             {
                JOptionPane.showMessageDialog( this , " 出错:  " + e.getMessage());
            }
        }         
    }
     // 保存
     public   void  save(File f)
     {
        String saveStr = text.getText();
        FileWriter fw = null ;
         try
         {
            fw =   new  FileWriter(f);
            fw.write(saveStr);
            fw.flush();
        }
         catch (Exception e)
         {
            JOptionPane.showMessageDialog( this , " 出错:  " + e.getMessage());
        }
         finally
         {
             try
             {
                fw.close();                
            }
             catch (IOException e)
             {
                JOptionPane.showMessageDialog( this , " 出错:  " + e.getMessage());
            }
        }
        haveCreated = false ;
        JOptionPane.showMessageDialog( this , " 文件保存成功! " );        
    }
     // 另存为
     public   void  saveAs()
     {
        JFileChooser fs  = new  JFileChooser();
        fs.showSaveDialog( this );
        File f  =  fs.getSelectedFile();
         if (f != null )
         {
            save(f);
             this .setTitle(f.getName() + " --记事本 " );
            file = f;
        }
        
    }
     /** 如果显示的文件内容与原来有改变，询问是否保存
     * @return  int 0: no operation  1:yes  2:no   3:cancel -1:error return
      */
     public   int  askForSave()
     {    
         if (haveCreated && text.getText() == "" )
         {
             return   0 ;
        }
        
         if (text.getText().equals(strtext) == false )
         {
            String fn;
             if (file != null )
             {
                fn = "" + file.getName();
            }
             else
             {
                fn = " 未命名 " ;
            }
             int  i = JOptionPane.showConfirmDialog( this , " 文件 " + fn + " 的文字已经改变。 " +
             " \n要保存文件吗？ " , " 记事本 " ,JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
            
             if (i == JOptionPane.YES_OPTION)
             {
                 if (file == null )
                 {
                    saveAs();
                }
                 else
                 {
                    save(file);