用Swing 組件編寫的記事本

 原文地址：http://www.blogjava.net/qnjian/archive/2006/04/15/41183.html

     以下是我用Swing 組件編寫的記事本，功能是模仿微軟的，使用了觀感，自我覺得界面比Win的記事本更爲好看（臭屁一下吧）。除了沒有做字體選擇之外，其他功能基本都有了吧。

/** **/ /**
 *Author: Zhang Zhijian 
 *Mail: [email protected]
 *Created  on 2005-5-22
 * 聲明：本程序版權歸作者所有，允許以學習目的的傳播，
 * 但必須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( " 編輯 " );
    JMenu meStyle       =   new  JMenu( " 風格 " );
    JMenu meHelp        =   new  JMenu( " 幫助 " );
        
    JMenuItem miCreate  =   new  JMenuItem( " 新建 " );    
    JMenuItem miOpen    =   new  JMenuItem( " 打開 " );    
    JMenuItem miSave    =   new  JMenuItem( " 保存 " );    
    JMenuItem miSaveAs  =   new  JMenuItem( " 另存爲 " );    
    JMenuItem miExit    =   new  JMenuItem( " 退出 " );    
    
    JMenuItem miUndo    =   new  JMenuItem( " 撤消 " );    
    JMenuItem miCut     =   new  JMenuItem( " 剪切 " );    
    JMenuItem miCopy    =   new  JMenuItem( " 複製 " );    
    JMenuItem miPaste   =   new  JMenuItem( " 粘貼 " );    
    JMenuItem miDelete  =   new  JMenuItem( " 刪除 " );    
    JMenuItem miFind    =   new  JMenuItem( " 查找 " );    
    JMenuItem miNext    =   new  JMenuItem( " 查找下一個 " );    
    JMenuItem miReplace =   new  JMenuItem( " 替換 " );
    
     // 右鍵彈出菜單項
    JMenuItem pmUndo    =   new  JMenuItem( " 撤消 " );
    JMenuItem pmCut     =   new  JMenuItem( " 剪切 " );        
    JMenuItem pmCopy    =   new  JMenuItem( " 複製 " );        
    JMenuItem pmPaste   =   new  JMenuItem( " 粘貼 " );        
    JMenuItem pmDelete  =   new  JMenuItem( " 刪除 " );
    
    JCheckBoxMenuItem miNewLine =   new  JCheckBoxMenuItem( " 自動換行 " );
    JMenu smLookFeel    =   new  JMenu( " 觀感 " );
    JMenuItem metal     =   new  JMenuItem( " Metal " );
    JMenuItem motif     =   new  JMenuItem( " Motif " );
    JMenuItem windows   =   new  JMenuItem( " Windows " );
        
    JMenuItem miAbout   =   new  JMenuItem( " 關於 " );
    
    JPopupMenu popupMenu;    
    JTextArea text      =   new  JTextArea();

        
     public  NotePad()
     {
         super ( " 我的記事本 " );
         // 爲便於區分事件源，設定名字
        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( " 宋體 " ,Font.BOLD, 15 ));
        meEdit.setFont( new  Font( " 宋體 " ,Font.BOLD, 15 ));
        meStyle.setFont( new  Font( " 宋體 " ,Font.BOLD, 15 ));
        meHelp.setFont( new  Font( " 宋體 " ,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);
         // 添加到右鍵彈出菜單
        popupMenu = new  JPopupMenu();
        popupMenu.add(pmUndo);
        popupMenu.addSeparator();
        popupMenu.add(pmCut);
        popupMenu.add(pmCopy);
        popupMenu.add(pmPaste);
        popupMenu.add(pmDelete);
         // 添加按鈕事件監聽
        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 );
        
         // 添加右鍵按鈕事件監聽器
        pmUndo.addActionListener( this );
        pmCut.addActionListener( this );
        pmCopy.addActionListener( this );
        pmPaste.addActionListener( this );
        pmDelete.addActionListener( this );
        
         // 文本區內容沒有選中時某些按鈕不可用
        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 );
        
         // 添加鍵盤輸入監聽器
        text.addFocusListener( new  MyFocusAdapter());
         // 添加鼠標監聽器，用於激活右鍵彈出菜單
        text.addMouseListener( new  MouseAdapter()
             {
                 public   void  mouseReleased(MouseEvent e)
                 {
                     if (e.isPopupTrigger())
                     {
                        popupMenu.show(e.getComponent(),e.getX(),e.getY());
                    }
                }
            } );
         // 添加窗口關閉監聽器    
        addWindowListener( new  WindowAdapter()
             {
                 public   void  windowClosing(WindowEvent e)
                 { // 詢問是否保存時選擇撤消
                     int  i;
                     if ( (i = askForSave()) == 3 )
                     {
                         return ;    
                    }
                    System.exit( 0 );                    
                }
            } );        
            
    
    }
////////////////////////// Methods //////////////////////////////////// /
     // 打開
     public   void  open()
     {        
        JFileChooser jc  = new  JFileChooser();
        jc.showOpenDialog( this );
        File f  =  jc.getSelectedFile();
         if (f == null ) // 沒有選擇文件則退出
         {
             return ;
        }
        file = f; // file 是File類的對象,爲本類屬性,在保存當前內容時用
         this .setTitle(f.getName() + " --記事本 " );        
        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);
            }
             // 保存在屬性strtext中，爲了便於撤消恢復及監視內容是否改變            
            strtext = new  String(ch, 0 ,num);
            haveCreated = false ;
            text.setText(strtext);
        }
         catch (Exception e)
         {
            JOptionPane.showMessageDialog( this , " 出錯:  " + e.getMessage());
        }
         finally
         {
             try
             {
                fr.close();                
            }
             catch (IOException e)
             {
                JOptionPane.showMessageDialog( this , " 出錯:  " + 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 , " 出錯:  " + e.getMessage());
        }
         finally
         {
             try
             {
                fw.close();                
            }
             catch (IOException e)
             {
                JOptionPane.showMessageDialog( this , " 出錯:  " + e.getMessage());
            }
        }
        haveCreated = false ;
        JOptionPane.showMessageDialog( this , " 文件保存成功! " );        
    }
     // 另存爲
     public   void  saveAs()
     {
        JFileChooser fs  = new  JFileChooser();
        fs.showSaveDialog( this );
        File f  =  fs.getSelectedFile();
         if (f != null )
         {
            save(f);
             this .setTitle(f.getName() + " --記事本 " );
            file = f;
        }
        
    }
     /** */ /** 如果顯示的文件內容與原來有改變，詢問是否保存
     * @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 + " 的文字已經改變。 " +
             " /n要保存文件嗎？ " , " 記事本 " ,JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
            
             if (i == JOptionPane.YES_OPTION)
             {
                 if (file == null )
                 {
                    saveAs();
                }
                 else
                 {
                    save(file);
                }
                 return   1 ;
                
            }
             if (i == JOptionPane.NO_OPTION)
             {
                 return   2 ;
            }
             if (i == JOptionPane.CANCEL_OPTION)
             {
                 return   3 ;
            }
        }
         return   - 1 ;
    }
     // 查找
     public   void  find(String str,  int  cur)
     {
         int  i = text.getText().indexOf(str,cur);
         if (i >= 0 )
         {
             this .text.setSelectionStart(i); // 使找到的字符串反白選中
             this .text.setSelectionEnd(i + str.length());
            findIndex =++ i; // 用於查找下一個
        }
         else
         {
            JOptionPane.showMessageDialog( this , " 查找完畢！ " ,  " 記事本 " ,
                JOptionPane.OK_OPTION  +  JOptionPane.INFORMATION_MESSAGE);    
        }     
    }
     // 替換全部
     public   void  replaceAll(String fromStr,String toStr, int  cur, int  end)
     {
         if (cur > end)
         {        
             return ;
        }
         else
         {    
             int  i = text.getText().indexOf(fromStr,cur);        
             if (i >= 0 )
             {
                text.setSelectionStart(i); // 使找到的字符串反白選中
                text.setSelectionEnd(i + fromStr.length());
                text.replaceSelection(toStr); // 替換
                cur =++ i;
            }
             else
             {
                JOptionPane.showMessageDialog( this , " 替換完畢！ " ,  " 記事本 " ,
                JOptionPane.OK_OPTION  +  JOptionPane.INFORMATION_MESSAGE);
                 return ;    
            }
            replaceAll(fromStr,toStr,cur,end);  // 遞歸查找與替換
        }
    }
     // 切換觀感    
     public   void  changeLookFeel(Component c, String plafName)
     {
         try
         {
            UIManager.setLookAndFeel(plafName);    
            SwingUtilities.updateComponentTreeUI(c);
        }
         catch (Exception e)
         {
            JOptionPane.showMessageDialog( this , " 觀感加載失敗！ " , " 記事本 " ,
                JOptionPane.YES_OPTION + JOptionPane.INFORMATION_MESSAGE);
        }
    }
//////////////////////// 實現監聽類的方法(本類實現了相應接口) ////////////////////////////////// /


     public   void  itemStateChanged(ItemEvent e)
     {
         if (e.getStateChange() == e.SELECTED)
         {
            text.setLineWrap( true );
        }
         else
         {
            text.setLineWrap( false );
        }
    }
    
     public   void  actionPerformed(ActionEvent e)
     {
        String com = e.getActionCommand();
         if (com.equals( " create " ))
         {     // 當前顯示的文件內容如有改變，詢問是否保存
             // 返回:詢問是否保存時選擇否        
             // 返回3:詢問是否保存時選擇撤消
             int  i;
             if ((i = askForSave()) == 3 )
             {
                 return ;
            }         
            text.setText( "" );
            file = null ;
             this .setTitle( " 未命名--記事本 " );
            strtext = "" ;                    
            haveCreated = true ;        
        }
         if (com.equals( " open " ))
         { // 詢問是否保存時選擇撤消
             int  i;
             if ((i = askForSave()) == 3 )
             {
                 return ;
            }         
            open();
            strtext = text.getText();
        }
         if (com.equals( " saveAs " ))
         {
            saveAs();
            strtext = text.getText();
        }
         if (com.equals( " save " ))
         {
             if (haveCreated || file == null )
             {
                saveAs();
            }
             else
             {
                save(file);
            }
            strtext = text.getText();            
        }
         if (com.equals( " undo " ))
         {
            text.setText(strtext);
        }
         if (com.equals( " cut " ))
         {
             // 先保存文本區內容,供撤消後恢復使用
            strtext = text.getText();
            text.cut();    
        }
         if (com.equals( " copy " ))
         {
            text.copy();
        }
         if (com.equals( " paste " ))
         {
            strtext = text.getText();
            text.paste();
        }
         if (com.equals( " delete " ))
         {
            strtext = text.getText();
            text.replaceSelection( "" );
        }
         if (com.equals( " find " ))
         {    
            findIndex = 0 ;            
            FindDialog fd  =   new  FindDialog( this );                    
        }
         if (com.equals( " next " ))
         {
             // 沒有選中內容則從頭開始查找
            String str  =  text.getSelectedText();
             if (str == "" || str == null )
             {
                findIndex = 0 ;
            }
             if (str == null )
             {
                FindDialog fd  =   new  FindDialog( this );
            }
             else
             {
                find(str,text.getSelectionStart() + 1 );
            }     
        }
         if (com.equals( " replace " ))
         {
            ReplaceDialog rd  =   new  ReplaceDialog( this );
        }         
         if (com.equals( " about " ))
         {
            JOptionPane.showMessageDialog( this , " 我的記事本  V1.0/n作者：ZhiJian Zhang /n2005/5/25 Copyright " ,
                 " 關於我的記事本 " ,JOptionPane.OK_OPTION + JOptionPane.INFORMATION_MESSAGE);
        }     
         // 觀感選擇
         if (e.getActionCommand().equals( " Metal " ))
         {
            String metal_str = " javax.swing.plaf.metal.MetalLookAndFeel " ;
            changeLookFeel( this ,metal_str);
        }
         if (e.getActionCommand().equals( " Motif " ))
         {
            String motif_str = " com.sun.java.swing.plaf.motif.MotifLookAndFeel " ;
            changeLookFeel( this ,motif_str);
        }
         if (e.getActionCommand().equals( " Windows " ))
         {
             // String windows_str="com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel"
            String windows_str = " com.sun.java.swing.plaf.windows.WindowsLookAndFeel " ;
            changeLookFeel( this ,windows_str);    
        }                     
         if (e.getActionCommand().equals( " exit " ))
         {
             int  i;
             if ( (i = askForSave()) == 3 )
             {
                 return ;
            }
            System.exit( 0 );
        }         
    }
////////////////////////////// /內部監聽類 ////////////////////////////
// 監聽文本區變動
     class  MyFocusAdapter  extends  FocusAdapter
     { // 如果文本區沒有選中的內容，則相應菜單項不可用
         public   void  focusLost(FocusEvent e)
         {
            String str  =  text.getSelectedText();
             if (str != "" && str != null )
             {
                 // 菜單項
                miCut.setEnabled( true );
                miCopy.setEnabled( true );
                miDelete.setEnabled( true );
                 // 右鍵菜單項
                pmCut.setEnabled( true );
                pmCopy.setEnabled( true );
                pmDelete.setEnabled( true );
            }
             else
             {
                miCut.setEnabled( false );
                miCopy.setEnabled( false );
                miDelete.setEnabled( false );
            
                pmCut.setEnabled( false );
                pmCopy.setEnabled( false );
                pmDelete.setEnabled( false );    
            }             
        }
    }     
     public   static   void  main(String[] args)
     {
        NotePad nt  =   new  NotePad();
        
    }
    
} // End of main class

////////////////////////// 外部類 ////////////////////////////////
//////////////////// /查找對對話框類 ////////////////////////////
class  FindDialog  extends  JDialog  implements  ActionListener
{
     // 引入np屬性是爲了通過構造器的參數傳入NotePad的對象,
     // 從而方便訪問其內部屬性與方法
    NotePad np;
    JTextField tex;
    JLabel label;
    JButton find;
    JButton exit;
     public  FindDialog(NotePad owener)
     {
         super (owener, " 查找 " , false );
          this .np  =  owener;
         label    =   new  JLabel( "   查找內容 " );
         tex     =   new  JTextField( 5 );            
         find     =   new  JButton( " 查找下一個 " );
         exit     =   new  JButton( " 取消 " );
         Container contentPane  =  getContentPane();
         contentPane.setLayout( new  GridLayout( 2 , 2 ));
         contentPane.add(label);
         contentPane.add(tex);
         contentPane.add(find);
         contentPane.add(exit);
          this .setSize( 210 , 80 );
          this .setLocation( 450 , 350 );         
          this .setResizable( false );
         
         find.addActionListener( this );
         exit.addActionListener( this );
         tex.addKeyListener( new  MyKeyAdapter());
         find.setEnabled( false );         
          this .setVisible( true );
         
    }
     public   void  actionPerformed(ActionEvent e)
     {
        String str = np.text.getSelectedText();
         if (str == "" || str == null )
         {
            np.findIndex = 0 ;
        }
         if (e.getSource() == find)
         {            
            np.find(tex.getText(),np.findIndex);
        }
         else   if (e.getSource() == exit)
         {
             this .dispose();
        }
    }
     class  MyKeyAdapter  extends  KeyAdapter
     {        
         public   void  keyReleased(KeyEvent e)
         {
             if (np.text.getSelectedText() != "" )
             {
                find.setEnabled( true );
            }
        }
    }
}
////////////////////// 查找替換對話框 //////////////////////// /
class  ReplaceDialog  extends  JDialog  implements  ActionListener
{
    NotePad np;
    JTextField ft;
    JTextField rt;
    JLabel b1;
    JLabel b2;
    JButton find;
    JButton rp;
    JButton rpa;
    JButton exit;
     public  ReplaceDialog(NotePad owener)
     {
         super (owener, " 替換 " , false );
          this .np  =  owener;
         b1  =   new  JLabel( " 查找內容 " );
         b2  =   new  JLabel( " 替  換  爲　 " );
         ft = new  JTextField( 8 );
          // 初始狀態將已查找到的字符串放在此文本框中
         ft.setText(owener.text.getSelectedText());
         rt = new  JTextField( 8 );
                     
         find  =   new  JButton( " 查找下一個 " );
         rp    = new  JButton( " 替     換 " );
         rpa   = new  JButton( " 全部替換 " );
         exit     =   new  JButton( " 取       消 " );
         Container cp  =  getContentPane();
         JPanel p1 =   new  JPanel();
         JPanel p2 =   new  JPanel();
         JPanel p3 =   new  JPanel();
         
         p1.setLayout( new  GridLayout( 2 , 3 , 5 , 2 ));
         p1.add(b1);
         p1.add(ft);
         p1.add(find);
         p1.add(b2);
         p1.add(rt);
         p1.add(rp);         
         cp.add(p1,BorderLayout.NORTH);
         
         p2.setLayout( new  FlowLayout(FlowLayout.RIGHT));
         p2.add(rpa);
         p2.add(exit);
         cp.add(p2,BorderLayout.SOUTH);     
         
          this .setSize( 350 , 120 );
          this .setLocation( 400 , 350 );         
          this .setResizable( false );
         
         find.addActionListener( this );
         rp.addActionListener( this );
         rpa.addActionListener( this );
         exit.addActionListener( this );
         
         ft.addKeyListener( new  MyKeyAdapter());
         rt.addKeyListener( new  MyKeyAdapter());
         find.setEnabled( false );
         rp.setEnabled( false );
         rpa.setEnabled( false );
                  
          this .setVisible( true );
    }
    
     public   void  actionPerformed(ActionEvent e)
     {        
         if (e.getSource() == find)
         {    
             /**/ /* String str=np.text.getSelectedText();
            if(str==""||str==null)
            {
                np.findIndex=0;
            } */
             if (ft.getText().equals(np.findStr) == false )
             {
                np.findIndex = 0 ;
            }     
            np.findStr = ft.getText();    
            np.find(np.findStr,np.findIndex);                
        }
         if (e.getSource() == rp)
         {
            String str = np.text.getSelectedText();
             if (str != "" && str != null )
             {
                np.text.replaceSelection(rt.getText());
            }             
        }
         if (e.getSource() == rpa)
         {
             int  n = np.text.getText().length();
            np.replaceAll(ft.getText(),rt.getText(), 0 ,n);
        }
         else   if (e.getSource() == exit)
         {
             this .dispose();
        }
    }
     class  MyKeyAdapter  extends  KeyAdapter
     { // 如果查找或替換框內沒有內容則相應按鈕不可用        
         public   void  keyReleased(KeyEvent e)
         {
             if (ft.getText() != "" )
             {
                find.setEnabled( true );
            }
             if (rt.getText() != "" )
             {
                rp.setEnabled( true );
                rpa.setEnabled( true );
            }
        }
    }
}

      我將上面源代碼編譯後，打成可執行的Jar包，運行效果如下：