jishiben.java

程序人员在编程过程中如果遇到相关问题可以来这里进行参考

    copyBtn=new JButton(new ImageIcon("images/copy.gif"));
     copyBtn.setToolTipText("复制");
    toolBar1.add(copyBtn); 
      
      pasteBtn=new JButton(new ImageIcon("images/paste.gif"));
      toolBar1.add(pasteBtn);
      pasteBtn.setToolTipText("粘贴");
      //创建"文字工具"工具栏
      JToolBar toolBar2=new JToolBar("文字工具",SwingConstants.HORIZONTAL);
      toolBar2.add(comFont);
      toolBar2.add(comSize);
      toolBar2.addSeparator();
      toolBar2.add(bold);
      toolBar2.add(italic);
       //toolBar2.add(lineBtn);
      toolBar2.addSeparator();
      toolBar2.add(undoBtn);
       toolBar2.add(redoBtn);
      
       //创建日期工具栏
       JToolBar toolBar3=new JToolBar("当前日期",SwingConstants.HORIZONTAL);
       toolBar3.add(time);
       toolBar3.add(time1);
          class ClockThread extends Thread {
Date date = new Date();
Calendar calendar = new GregorianCalendar();
public ClockThread() {
calendar.setTime(date);
}
public void run() {
while (true) {
SimpleDateFormat dateFormat = new SimpleDateFormat(
"yyyy-MM-dd    HH:mm:ss     EEEE");
calendar.set(Calendar.SECOND,
calendar.get(Calendar.SECOND) + 1);
time1.setText(dateFormat.format(calendar.getTime()));
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
new ClockThread().start();
     
       //将各工具栏加入面板
      JPanel p=new JPanel(new FlowLayout(FlowLayout.LEFT));
      p.add(toolBar);
      p.add(toolBar1);
      p.add(toolBar2);
      p.add(toolBar3);
      c.add(p,BorderLayout.NORTH);
      //将按钮注册给动作事件的监听者
     openBtn.addActionListener(this);
     newBtn.addActionListener(this);
     cutBtn.addActionListener(this);
     copyBtn.addActionListener(this);
     pasteBtn.addActionListener(this);
     saveBtn.addActionListener(this);
     undoBtn.addActionListener(this);
      redoBtn.addActionListener(this);
//  lineBtn.addActionListener(this);
     //设置事件监听器，监听游标，动态显示行数和列数  

     text.addCaretListener(new CaretListener()
       {
         public void caretUpdate(CaretEvent e)
         {
           try
           {
              int pos = text.getCaretPosition();
              //Gets the position of the text insertion caret（游标） for this text component
               //获取行数
              int lineOfC = text.getLineOfOffset(pos) + 1;
             //Translates an offset into the components text to a line number. 
              
               //获取列数
              int col = pos - text.getLineStartOffset(lineOfC - 1) + 1;
              // Determines the offset of the start of the given line.
              statusBar.setText("当前光标位置       " + lineOfC + " 行  , " + col + " 列  ");
            }
            catch(Exception ex)
            {
              statusBar.setText("      无法获得当前光标位置");
            }
         }
       });
 

  //监听文档内容是否发生变化
text.getDocument().addDocumentListener(
new DocumentListener() {
public void changedUpdate(DocumentEvent de) {
    isChange = true;
}
public void insertUpdate(DocumentEvent de) {
    isChange = true;
}
public void removeUpdate(DocumentEvent de) {
    isChange = true;
   }
  }
 );

 }
   
    
  //辅助方法：测试JTextArea中文本是否有变化
    private boolean hasChange() {
 return isChange;
    }

  
     //内部方法：响应菜单事件
 private void newPerformed() {
 int value = -1;
 if(hasChange()) //若文件已更改
  if(fileName != null && fileName.exists()) {//文件名不为空并且文件名存在
     String[] buttonTexts = {"保存", "不保存", "取消"};
     value = JOptionPane.showOptionDialog(this, "源程序已经改变，请确认是否保存！", "保存更改？", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
     if(value == JOptionPane.YES_OPTION)
        savePerformed();
     else if(value == JOptionPane.NO_OPTION) {//不保存，初始化当前编辑器
        fileName = null;
        text.setText("");
        setTitle("小小记事本");
        return;
        }
     else if(value == JOptionPane.CANCEL_OPTION)
        return;
  }
  else {     //若文件名不存在，则另存，初始化当前编辑器
     saveAsPerformed();
   //  fileName = null;
     //text.setText("");
    // setTitle("程序编辑器");
    // return;
    }
 fileName = null;//文件未更改ho或已处理，初始化当前编辑器
 text.setText("");
 setTitle("小小记事本");
 isChange = false;
 return;
 
    }
 private void openPerformed() {
 BufferedReader input = null;
 String textString;
 int ret = fileChooser.showOpenDialog(this);
 if(ret != JFileChooser.APPROVE_OPTION)
    return;
 newPerformed();
 fileName = fileChooser.getSelectedFile();
 if(fileName.exists() && fileName.canRead()) {
     setTitle("小小记事本: " + fileName.getName()); 
     try{
         input = new BufferedReader(new FileReader(fileName));
         while((textString = input.readLine()) != null)
      text.append(textString + "\n");
         input.close();
     }
     catch(IOException e) {
         JOptionPane.showMessageDialog(this, "文件打开错误，没有打开");
     }
     finally {
  input = null;
     }
 }
 isChange = false;
 return;
    }

    private void savePerformed() { 
 if(!hasChange())
  return;
 FileWriter output = null;
 if(fileName != null && fileName.exists()) {
     try{
     output = new FileWriter(fileName);
     output.write(text.getText());
     }
     catch(IOException e)
     {
         JOptionPane.showMessageDialog(this, "文件写入错误，没有保存");
     }
     finally {
        try{ output.close();}catch(IOException ee){}
        output = null;
     }
     isChange = false;
      }
 else 
     saveAsPerformed();
   
   
    }
    private void saveAsPerformed() {
  if(!hasChange())
     return;
 FileWriter output = null;
 int ret = fileChooser.showSaveDialog(this);
 if(ret != JFileChooser.APPROVE_OPTION) { 
       isChange = true; 
     return;
 }
 fileName = fileChooser.getSelectedFile();
 setTitle("小小记事本: " + fileName.getName()); 
 try{
     output = new FileWriter(fileName);
          output.write(text.getText());  
 }
 catch(IOException e){
  JOptionPane.showMessageDialog(this, "文件写入错误，没有保存"); 
 }
 finally{
try{ output.close();}catch(IOException ee){}
     output = null;
 }
 isChange = false;
 return;
    }

   private void exitPerformed() {
 String[] buttonTexts = {"保存退出", "不保存退出", "取消"};
 int value = -1;
 if(hasChange()) {
     value = JOptionPane.showOptionDialog(this, "源程序已经改变，请是否选择保存或直接退出！", "退出程序", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
     switch(value)
     {
         case JOptionPane.YES_OPTION:
  savePerformed();
  break;
         case JOptionPane.NO_OPTION:
  System.exit(0);
  break;
         case JOptionPane.CANCEL_OPTION:
  isChange = true;
  return;
     }
 }
 else
     System.exit(0);
    }
  private void undoPerformed() {
 try{
  if(undo.canUndo())
   undo.undo();
 }catch(CannotUndoException e) {
  JOptionPane.showMessageDialog(this, "无法执行撤销操作", "撤销异常", JOptionPane.WARNING_MESSAGE);
 }
    }
   private void redoPerformed() {
 try{
  if(undo.canRedo())
   undo.redo();
 }catch(CannotRedoException e) {
  JOptionPane.showMessageDialog(this, "无法执行恢复操作", "恢复异常", JOptionPane.WARNING_MESSAGE);
 }
    }
 private void cutPerformed() {
 //textArea.cut();
 placeHolder=text.getSelectedText();
    	
        text.replaceRange("",text.getSelectionStart(),text.getSelectionEnd());
        statusBar.setText("执行了cut操作");
    }
    private void copyPerformed() {
// textArea.copy();
    	placeHolder=text.getSelectedText();
    	statusBar.setText("执行了copy操作");
    
    
    }
    private void pastePerformed() {
 //textArea.paste();
 
 	text.insert(placeHolder,text.getCaretPosition());
    	statusBar.setText("执行了Paste操作");
    }
    private void deletePerformed() {
 text.replaceRange(null, text.getSelectionStart(), text.getSelectionEnd());
    }
    private void foreColorPerformed(){
     color1=color.showDialog(this,"请选择字体颜色",Color.BLACK);
        text.setForeground(color1);     
    }
     private void backColorPerformed(){
     color2=color.showDialog(this,"请选择背景颜色",Color.WHITE);
        text.setBackground(color2);     
    }
        private void selectAllPerformed() {
 text.selectAll();
        }
        private void timePerformed() {
 text.insert((new Date()).toString(), text.getSelectionEnd());
    }
   private void findPerformed() {
         FindDialog dFind = new FindDialog(text, JiShiBen.this);
   dFind.setVisible(true);

    }
    private void findNextPerformed() {
 FindDialog dFind = new FindDialog(text, JiShiBen.this);
   dFind.setVisible(true); 

    }
    private void replacePerformed() {