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

    }
 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 pageSetPerformed() {
 System.out.println("显示页面设置对话框");
    }
    private void printPerformed() {
 System.out.println("显示打印对话框");
    }*/
   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 findPerformed() {
 String findString = JOptionPane.showInputDialog(this, );
    }
    private void findNextPerformed() {
 System.out.println("查找下一个");
    }
    private void replacePerformed() {
 System.out.println("替换");
    }
    private void goToLinePerformed() {
 System.out.println("转到");
    }
    private void selectAllPerformed() {
 textArea.selectAll();
    }
    private void timePerformed() {
 textArea.insert((new Date()).toString(), textArea.getSelectionEnd());
    }
    private void autoNextLinePerformed() {
 System.out.println("自动换行");
    }
    private void fontPerformed() {
 System.out.println("字体");
    }
    private void helpPerformed() {
 System.out.println("帮助主题");
    }
    private void aboutPerformed() {
 System.out.println("关于程序");
    }
 */
  
  
  
   /**
    *<p>Title: </p>
    *<p>Description: 处理菜单出发的事件</p>
    *<p>Copyright: Copyright (c) 2005</p>
    *<p>Company: </p>
    *@author 红色彼岸
    *@version 0.1
    */
    class MenuItemEventHandler implements ActionListener{
 public void actionPerformed(ActionEvent e) {
     JMenuItem item = (JMenuItem)e.getSource();
     if(item == mi_File_New||item==pi_New)
  newPerformed();
     else if(item == mi_File_Open)
  openPerformed();
     else if(item == mi_File_Save )
  savePerformed();
     else if(item == mi_File_LSave)
  saveAsPerformed();
  //   else if(item == pageSetItem)
  //pageSetPerformed();
  //   else if(item == printItem)
 // printPerformed();
     else if(item == mi_File_Exit)
  exitPerformed();
   //  else if(item == undoItem)
  //undoPerformed();
   //  else if(item == redoItem)
  //redoPerformed();
     else if(item == mi_Edit_Cut)
  cutPerformed();
     else if(item == mi_Edit_Copy)
  copyPerformed();
     else if(item == mi_Paste_Part)
  pastePerformed();
     else if(item == pi_Del)
  deletePerformed();
     else if(item==foreColor)
         foreColorPerformed();
       else if(item==backColor)
         backColorPerformed();
 //    else if(item == findItem)
  //findPerformed();
 //    else if(item == findNextItem)
//  findNextPerformed();
 //    else if(item == replaceItem)
 // replacePerformed();
  //   else if(item == goToLineItem)
 //goToLinePerformed();
  //   else if(item == selectAllItem)
//  selectAllPerformed();
//     else if(item == timeItem)
 // timePerformed();
 //    else if(item == autoNextLineItem)
 // autoNextLinePerformed();
 //    else if(item == fontItem)
 // fontPerformed();
 //    else if(item == helpItem)
//  helpPerformed();
//     else if(item == aboutItem)
// aboutPerformed();
 }
    }
 
  
  
   
   
   
   
   //类SimpleEditor作为动作事件的监听器，方法中要区分事件源
    public void actionPerformed(ActionEvent e){
   
        Object m=e.getSource();
   
     if((JButton)m==cutBtn)
    {
    	
       cutPerformed();
   } 
          else if((JButton)m ==saveBtn)
        {
          savePerformed();
        } 
    
    else if((JButton)m ==newBtn)
        {
          newPerformed();
        }
 
  else if(m==copyBtn)
    {
    copyPerformed();
    }
    else if(m==pasteBtn)
    {
    pastePerformed();
    }
   else if(m==openBtn)  
       openPerformed();
//color.showDialog(this,"color",Color.BLACK);
    }  
  //  else if(m==selectAll)
  //  {
  //  	text.selectAll();
 //   }
  

    public static void main(String args[])
    {
        JiShiBen f = new JiShiBen();
        f.setSize(300,200);
        f.setVisible(true);
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we)  {
                System.exit(0);
            }
        });
    }
}