notepad.java

基于原本对该课题的了解

		});
	
		//创建"查找与替换"对话框的界面
		JPanel bottomPanel=new JPanel();
		JPanel centerPanel=new JPanel();
		JPanel topPanel=new JPanel();
	
		JPanel direction=new JPanel();
		direction.setBorder(BorderFactory.createTitledBorder("方向"));
		direction.add(up);
		direction.add(down);
		
		JPanel replacePanel=new JPanel();
		replacePanel.setLayout(new GridLayout(2,1));
		replacePanel.add(replace);
		replacePanel.add(replaceAll);

		topPanel.add(searchContentLabel);
		topPanel.add(findText);
		topPanel.add(searchNext);
		centerPanel.add(replaceContentLabel);
		centerPanel.add(replaceText);
		centerPanel.add(replacePanel);
		bottomPanel.add(matchcase);
		bottomPanel.add(direction);
		bottomPanel.add(cancel);

		con.add(topPanel);
		con.add(centerPanel);
		con.add(bottomPanel);
		
		//设置"查找与替换"对话框的大小、可更改大小(否)、位置和可见性
		findDialog.setSize(410,210);
		findDialog.setResizable(false);
		findDialog.setLocation(230,280);
		findDialog.setVisible(true);
		
	}			/*方法mySearch()结束*/	
	
    
	//实现ActionListener的事件处理方法public void actionPerformed(ActionEvent e)
	public void actionPerformed(ActionEvent e)
	{
		//新建
		if(e.getSource()==fileMenu_New)
			{
				editArea.requestFocus();
				String currentValue=editArea.getText();
				boolean isTextChange=(currentValue.equals(oldValue))?false:true;				
				if(isTextChange){					
					int saveChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存。是否保存?","提示",JOptionPane.YES_NO_CANCEL_OPTION);					
					if(saveChoose==JOptionPane.YES_OPTION)
					{
						String str=null;							
						JFileChooser fileChooser=new JFileChooser();
						fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
						fileChooser.setApproveButtonText("确定");
						fileChooser.setDialogTitle("另存为");						
						int result=fileChooser.showSaveDialog(this);						
						if(result==JFileChooser.CANCEL_OPTION){
							statusLabel.setText("您没有选择任何文件");
							return;
						}						
						File saveFileName=fileChooser.getSelectedFile();					
						if(saveFileName==null||saveFileName.getName().equals(""))
							JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
						else {
								try{
									FileWriter fw=new FileWriter(saveFileName);
									BufferedWriter bfw=new BufferedWriter(fw);
									bfw.write(editArea.getText(),0,editArea.getText().length());
									bfw.flush();
									fw.close();									
									isNewFile=false;
									currentFile=saveFileName;
									oldValue=editArea.getText();									
									this.setTitle(saveFileName.getName()+"  - 记事本");
									statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());
								}
								
								catch(IOException ioException){					
								}				
						}				
					}
								
					else if(saveChoose==JOptionPane.NO_OPTION){
						editArea.replaceRange("", 0, editArea.getText().length()); 
						statusLabel.setText("　新建文件");
						this.setTitle("无标题 - 记事本");
						isNewFile=true;
//						undo.discardAllEdits();	//撤消所有的"撤消"和"重做"操作																	        popupMenu_Undo.setEnabled(false);					 
						popupMenu_Redo.setEnabled(false);
						oldValue=editArea.getText();
					}
					
					else if(saveChoose==JOptionPane.CANCEL_OPTION)
					{
						return;
					}
				}
				
				else
				{
					editArea.replaceRange("", 0, editArea.getText().length()); 
					statusLabel.setText("　新建文件");
					this.setTitle("无标题 - 记事本");
					isNewFile=true;
//					undo.discardAllEdits(); 					
					popupMenu_Undo.setEnabled(false);					
					popupMenu_Redo.setEnabled(false); 
					oldValue=editArea.getText();	
				}
			}//新建处理结束
			
		//打开
		else if(e.getSource()==fileMenu_Open)
			{	
				editArea.requestFocus();
				String currentValue=editArea.getText();
				boolean isTextChange=(currentValue.equals(oldValue))?false:true;				
				if(isTextChange){					
					int saveChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存。是否保存?","提示",JOptionPane.YES_NO_CANCEL_OPTION);					
					if(saveChoose==JOptionPane.YES_OPTION)
					{			
						String str=null;						
						JFileChooser fileChooser=new JFileChooser();
						fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
						fileChooser.setApproveButtonText("确定");
						fileChooser.setDialogTitle("另存为");
						
						int result=fileChooser.showSaveDialog(this);
						
						if(result==JFileChooser.CANCEL_OPTION){
							statusLabel.setText("您没有选择任何文件");
							return;
						}								
						File saveFileName=fileChooser.getSelectedFile();
					
						if(saveFileName==null||saveFileName.getName().equals(""))
							JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
						else {
								try{
									FileWriter fw=new FileWriter(saveFileName);
									BufferedWriter bfw=new BufferedWriter(fw);
									bfw.write(editArea.getText(),0,editArea.getText().length());
									bfw.flush();
									fw.close();
									
									isNewFile=false;
									currentFile=saveFileName;
									oldValue=editArea.getText();
									
									this.setTitle(saveFileName.getName()+"  - 记事本");
									statusLabel.setText("当前打开文件:"+saveFileName.getAbsoluteFile());
								}
								catch(IOException ioException){					
								}				
						}
					}
					else if(saveChoose==JOptionPane.NO_OPTION){
						String str=null;							
						JFileChooser fileChooser=new JFileChooser();
						fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
						fileChooser.setApproveButtonText("确定");
						fileChooser.setDialogTitle("打开文件");
						
						int result=fileChooser.showOpenDialog(this);
						
						if(result==JFileChooser.CANCEL_OPTION){
							statusLabel.setText("您没有选择任何文件");
							return;
						}						
						File fileName=fileChooser.getSelectedFile();					
						if(fileName==null||fileName.getName().equals(""))
							JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
						else {
						
							try{
								FileReader fr=new FileReader(fileName);
								BufferedReader bfr=new BufferedReader(fr);							
								editArea.setText("");							
								while((str=bfr.readLine())!=null){//每次读取一行，直到文件结束
									editArea.append(str+"\15\12");
								}//endwhile					
								this.setTitle(fileName.getName()+"  - 记事本");
								statusLabel.setText("　当前打开文件:"+fileName.getAbsoluteFile());											
								fr.close();
								isNewFile=false;
								currentFile=fileName;
								oldValue=editArea.getText();
							}							
							catch(IOException ioException){
							}
						}
					}
					else{
							return;
					}
				}
					
				else{
					String str=null;
					
					JFileChooser fileChooser=new JFileChooser();
					fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
					fileChooser.setApproveButtonText("确定");
					fileChooser.setDialogTitle("打开文件");					
					int result=fileChooser.showOpenDialog(this);					
					if(result==JFileChooser.CANCEL_OPTION){
						statusLabel.setText("　您没有选择任何文件");
						return;
					}
						
					File fileName=fileChooser.getSelectedFile();
				
					if(fileName==null||fileName.getName().equals(""))
						JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
					else {						
						try{
							FileReader fr=new FileReader(fileName);
							BufferedReader bfr=new BufferedReader(fr);
							
							editArea.setText("");
							
							while((str=bfr.readLine())!=null){//每次读取一行，直到文件结束
								editArea.append(str+"\15\12");
							}//endwhile
								
							this.setTitle(fileName.getName()+"  - 记事本");
							statusLabel.setText("　当前打开文件:"+fileName.getAbsoluteFile());
										
							fr.close();
							isNewFile=false;
							currentFile=fileName;
							oldValue=editArea.getText();
						}							
						catch(IOException ioException){
						}
					}
				
				}
			}//"打开"处理结束
		
		//保存	
		else if(e.getSource()==fileMenu_Save)
			{
				editArea.requestFocus();
				if(isNewFile){
				
					String str=null;
					
					JFileChooser fileChooser=new JFileChooser();
					fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
					fileChooser.setApproveButtonText("确定");
					fileChooser.setDialogTitle("另存为");
					
					int result=fileChooser.showSaveDialog(this);
					
					if(result==JFileChooser.CANCEL_OPTION){
						statusLabel.setText("　您没有选择任何文件");
						return;
					}					
	
					File saveFileName=fileChooser.getSelectedFile();
				
					if(saveFileName==null||saveFileName.getName().equals(""))
						JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
					else {
						try{
							FileWriter fw=new FileWriter(saveFileName);
							BufferedWriter bfw=new BufferedWriter(fw);
							bfw.write(editArea.getText(),0,editArea.getText().length());
							bfw.flush();
							fw.close();
							
							isNewFile=false;
							currentFile=saveFileName;
							oldValue=editArea.getText();
							
							this.setTitle(saveFileName.getName()+"  - 记事本");
							statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());
						}							
						catch(IOException ioException){					
						}				
					}
				}
				else
				{
					try{
						FileWriter fw=new FileWriter(currentFile);
						BufferedWriter bfw=new BufferedWriter(fw);
						bfw.write(editArea.getText(),0,editArea.getText().length());
						bfw.flush();
						fw.close();
					}							
					catch(IOException ioException){					
					}
				}
			}//"保存"处理结束
		
		//另存为	
		else if(e.getSource()==fileMenu_SaveAs)
			{
				editArea.requestFocus();
				String str=null;
				
				JFileChooser fileChooser=new JFileChooser();
				fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
				fileChooser.setApproveButtonText("确定");
				fileChooser.setDialogTitle("另存为");				
				int result=fileChooser.showSaveDialog(this);				
				if(result==JFileChooser.CANCEL_OPTION){
					statusLabel.setText("　您没有选择任何文件");
					return;
				}				

				File saveFileName=fileChooser.getSelectedFile();
			
				if(saveFileName==null||saveFileName.getName().equals(""))
					JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
				else {
					try{
						FileWriter fw=new FileWriter(saveFileName);
						BufferedWriter bfw=new BufferedWriter(fw);
						bfw.write(editArea.getText(),0,editArea.getText().length());
						bfw.flush();
						fw.close();
						oldValue=editArea.getText();
						
						this.setTitle(saveFileName.getName()+"  - 记事本");
						statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());
					}						
					catch(IOException ioException){					
					}				
				}
			
			}//"另存为"处理结束
		
		
		//退出
		else if(e.getSource()==fileMenu_Exit){
                    	editArea.requestFocus();
				String currentValue=editArea.getText();
				boolean isTextChange=(currentValue.equals(oldValue))?false:true;
				
				if(isTextChange){
					
					int saveChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存。是否保存?","提示",JOptionPane.YES_NO_CANCEL_OPTION);
					
					if(saveChoose==JOptionPane.YES_OPTION)
					{			
						String str=null;
						
						JFileChooser fileChooser=new JFileChooser();
						fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
						fileChooser.setApproveButtonText("确定");
						fileChooser.setDialogTitle("另存为");
						
						int result=fileChooser.showSaveDialog(this);
						
						if(result==JFileChooser.CANCEL_OPTION){
							statusLabel.setText("您没有选择任何文件");
							return;
						}					
			
						File saveFileName=fileChooser.getSelectedFile();
					
						if(saveFileName==null||saveFileName.getName().equals(""))
							JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
						else {
								try{
									FileWriter fw=new FileWriter(saveFileName);
									BufferedWriter bfw=new BufferedWriter(fw);
									bfw.write(editArea.getText(),0,editArea.getText().length());
									bfw.flush();
									fw.close();
									
									isNewFile=false;
									currentFile=saveFileName;
									oldValue=editArea.getText();
									
									this.setTitle(saveFileName.getName()+"  - 记事本");
									statusLabel.setText("当前打开文件:"+saveFileName.getAbsoluteFile());
								}
								catch(IOException ioException){					
								}				
						}
					}
					else if(saveChoose==JOptionPane.NO_OPTION){
						String str=null;
							
						JFileChooser fileChooser=new JFileChooser();
						fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
						fileChooser.setApproveButtonText("确定");
						fileChooser.setDialogTitle("打开文件");
						
						int result=fileChooser.showOpenDialog(this);
						
						if(result==JFileChooser.CANCEL_OPTION){
							statusLabel.setText("您没有选择任何文件");
							return;
						}
							
						File fileName=fileChooser.getSelectedFile();
						
						if(fileName==null||fileName.getName().equals(""))
							JOptionPane.showMessageDialog(this,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
						else {
						
							try{
								FileReader fr=new FileReader(fileName);
								BufferedReader bfr=new BufferedReader(fr);
								
								editArea.setText("");
								
								while((str=bfr.readLine())!=null){//每次读取一行，直到文件结束
									editArea.append(str+"\15\12");
								}//endwhile
								
								this.setTitle(fileName.getName()+"  - 记事本");
								statusLabel.setText("　当前打开文件:"+fileName.getAbsoluteFile());
											
								fr.close();
								isNewFile=false;
								currentFile=fileName;
								oldValue=editArea.getText();
							}							
							catch(IOException ioException){
							}
						}
					}
					else{
							return;
					}
				}
			
			else{			
				System.exit(0);
			}
		}
             

		//剪切
		else if(e.getSource()==editMenu_Cut||e.getSource()==popupMenu_Cut)
			{
				editArea.requestFocus();
				String text=editArea.getSelectedText();
       			StringSelection selection=new StringSelection(text);
       			clipBoard.setContents(selection,null);
       			editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());
//       			checkMenuItemEnabled();	//设置剪切、复制、粘贴、删除等功能的可用性
			}
		
		//复制
		else if(e.getSource()==editMenu_Copy||e.getSource()==popupMenu_Copy)
			{
				editArea.requestFocus();
			    String text=editArea.getSelectedText();
       			StringSelection selection=new StringSelection(text);
       			clipBoard.setContents(selection,null);
//       			
			}