notepad.java

基于原本对该课题的了解

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package javaapplication6;


 
 
 //import java packages 
 import java.awt.*;
 import java.awt.event.*;
 import java.text.*;
 import java.util.*;
 import java.io.*;
 import javax.swing.undo.*;
 import javax.swing.border.*;
 import javax.swing.*;
 import javax.swing.text.*;
 import javax.swing.event.*;
 import java.awt.datatransfer.*;
 

 public class Notepad extends JFrame implements ActionListener/*,DocumentListener*/{
 	 
  	//定义变量
  	
  	//菜单
 	JMenu fileMenu,editMenu,formatMenu;
 	
 	//"文件"的菜单项
 	JMenuItem fileMenu_New,fileMenu_Open,fileMenu_Save,fileMenu_SaveAs,fileMenu_PageSetup,fileMenu_Print,fileMenu_Exit;
 
 	//"编辑"的菜单项	
 	JMenuItem editMenu_Undo,editMenu_Redo,editMenu_Cut,editMenu_Copy,editMenu_Paste,editMenu_Delete,editMenu_Find,editMenu_FindNext,editMenu_Replace,
			  editMenu_GoTo,editMenu_SelectAll,editMenu_TimeDate;
 			
 	//"格式"的菜单项
	JCheckBoxMenuItem formatMenu_LineWrap;
	JMenu formatMenu_Color; 
	JMenuItem formatMenu_Font,formatMenu_Color_FgColor,formatMenu_Color_BgColor;
 		
 	//"帮助"的菜单项
 	JMenuItem helpMenu_HelpTopics,helpMenu_About;
 	
 	//文本编辑区域
 	JTextArea editArea;
 	
 	//状态栏标签
 	JLabel statusLabel;
 	
 	//弹出菜单及菜单项
 	JPopupMenu popupMenu;
 	JMenuItem popupMenu_Undo,popupMenu_Redo,popupMenu_Cut,popupMenu_Copy,popupMenu_Paste,popupMenu_Delete,popupMenu_SelectAll;
	
	//系统剪贴板
	Toolkit toolKit=Toolkit.getDefaultToolkit();
	Clipboard clipBoard=toolKit.getSystemClipboard();
	
	//其它变量
	boolean isNewFile=true;	//是否新文件(未保存过的)
	File currentFile;		//当前文件名
	String oldValue;		//存放编辑区原来的内容，用于比较文本是否有改动
	JButton fontOkButton;	//字体设置里的"确定"按钮
			
	//创建撤消操作管理器
/*	protected UndoManager undo = new UndoManager(); 
	protected UndoableEditListener undoHandler = new UndoHandler();*/
	
	//设置编辑区默认字体 
	protected Font defaultFont=new Font("宋体",Font.PLAIN,12);
		
	//构造函数开始 
	public Notepad()
	{
		super("欢迎使用");
		
		//获取容器
		Container container=getContentPane();

		//创建菜单条
		JMenuBar menuBar = new JMenuBar(); 
				
		//创建文件菜单及菜单项并注册事件监听
		JMenu fileMenu = new JMenu("文件(F)", true); 
		fileMenu.setMnemonic('F'); 

		fileMenu_New = new JMenuItem("新建(N)", 'N'); 
		fileMenu_New.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK)); 
		fileMenu_New.addActionListener(this); 

		fileMenu_Open = new JMenuItem("打开(O)...", 'O'); 
		fileMenu_Open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK)); 
		fileMenu_Open.addActionListener(this); 

		fileMenu_Save = new JMenuItem("保存(S)", 'S'); 
		fileMenu_Save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK)); 
		fileMenu_Save.addActionListener(this); 
                
		fileMenu_SaveAs = new JMenuItem("另存为(A)...", 'A'); 
		fileMenu_SaveAs.addActionListener(this); 
                
		fileMenu_Exit = new JMenuItem("退出(X)",'X'); 
		fileMenu_Exit.addActionListener(this); 	
                
		//创建编辑菜单及菜单项并注册事件监听
		JMenu editMenu = new JMenu("编辑(E)", true);
		editMenu.setMnemonic('E'); 
		editMenu.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e){
				}
			}
		);		
		editMenu_Cut = new JMenuItem("剪切(T)",'T'); 
		editMenu_Cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK)); 
		editMenu_Cut.addActionListener(this); 

		editMenu_Copy = new JMenuItem("复制(C)",'C'); 
		editMenu_Copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK)); 
		editMenu_Copy.addActionListener(this); 

		editMenu_Paste = new JMenuItem("粘贴(P)",'P'); 
		editMenu_Paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK)); 
		editMenu_Paste.addActionListener(this);
		
		editMenu_Delete = new JMenuItem("删除(L)",'L'); 
		editMenu_Delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0)); 
		editMenu_Delete.addActionListener(this); 
		
		editMenu_Find = new JMenuItem("查找(F)...",'F'); 
		editMenu_Find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_MASK)); 
		editMenu_Find.addActionListener(this);
		
		editMenu_FindNext = new JMenuItem("查找下一个(N)",'N');
		editMenu_FindNext.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3,0));
		editMenu_FindNext.addActionListener(this); 

		editMenu_Replace = new JMenuItem("替换(R)...",'R'); 
		editMenu_Replace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H, InputEvent.CTRL_MASK)); 
		editMenu_Replace.addActionListener(this); 

		editMenu_GoTo = new JMenuItem("转到(G)...",'G'); 
		editMenu_GoTo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G, InputEvent.CTRL_MASK)); 
		editMenu_GoTo.addActionListener(this); 

		editMenu_SelectAll = new JMenuItem("全选",'A'); 
		editMenu_SelectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK)); 
		editMenu_SelectAll.addActionListener(this); 
		
		editMenu_TimeDate = new JMenuItem("时间/日期(D)",'D');
		editMenu_TimeDate.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5,0));
		editMenu_TimeDate.addActionListener(this);

		//创建格式菜单及菜单项并注册事件监听
		JMenu formatMenu = new JMenu("格式(O)", true);
		formatMenu.setMnemonic('O'); 
		
		formatMenu_LineWrap = new JCheckBoxMenuItem("自动换行(W)"); 
		formatMenu_LineWrap.setMnemonic('W'); 
		formatMenu_LineWrap.setState(true); 
		formatMenu_LineWrap.addActionListener(this); 
		formatMenu_Font = new JMenuItem("字体(F)...",'F');
		formatMenu_Font.addActionListener(this);
		formatMenu_Color = new JMenu("设置颜色"); 
		formatMenu_Color_FgColor=new  JMenuItem("字体颜色");
		formatMenu_Color_FgColor.addActionListener(this);
		formatMenu_Color_BgColor=new JMenuItem("背景颜色");
		formatMenu_Color_BgColor.addActionListener(this);
                addWindowListener(new closeWindow());
                
                
		//向菜单条添加"文件"菜单及菜单项 
		menuBar.add(fileMenu); 
		fileMenu.add(fileMenu_New); 
		fileMenu.add(fileMenu_Open); 
		fileMenu.add(fileMenu_Save); 
		fileMenu.add(fileMenu_SaveAs); 
		fileMenu.addSeparator();		//分隔线		
		fileMenu.add(fileMenu_Exit); 
		
		//向菜单条添加"编辑"菜单及菜单项 
		menuBar.add(editMenu); 		 
		editMenu.addSeparator();		//分隔线 
		editMenu.add(editMenu_Cut); 
		editMenu.add(editMenu_Copy); 
		editMenu.add(editMenu_Paste); 
		editMenu.add(editMenu_Delete); 
		editMenu.addSeparator(); 		//分隔线
		editMenu.add(editMenu_Find); 
		editMenu.add(editMenu_FindNext); 
		editMenu.add(editMenu_Replace);		 
		editMenu.addSeparator();  		//分隔线
		editMenu.add(editMenu_SelectAll); 
		editMenu.add(editMenu_TimeDate);
		
		//向菜单条添加"格式"菜单及菜单项		
		menuBar.add(formatMenu); 
		
		formatMenu.add(formatMenu_Font); 
		formatMenu.addSeparator();
		formatMenu.add(formatMenu_Color);
		formatMenu_Color.add(formatMenu_Color_FgColor);
		formatMenu_Color.add(formatMenu_Color_BgColor); 
                
		//向窗口添加菜单条				
		this.setJMenuBar(menuBar);				
		//创建文本编辑区并添加滚动条
		editArea=new JTextArea(20,50);
		JScrollPane scroller=new JScrollPane(editArea);
		scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		container.add(scroller,BorderLayout.CENTER);//向容器添加文本编辑区
		editArea.setWrapStyleWord(true);			//设置单词在一行不足容纳时换行
		editArea.setLineWrap(true);					//设置文本编辑区自动换行默认为true,即会"自动换行"
		editArea.setFont(defaultFont);				//设置编辑区默认字体
                editArea.setBackground(Color.white);		//设置编辑区默认背景色
                editArea.setForeground(Color.black);		//设置编辑区默认前景色
		oldValue=editArea.getText();				//获取原文本编辑区的内容		
		

		
		
		//创建右键弹出菜单
		popupMenu=new JPopupMenu();
		popupMenu_Undo=new JMenuItem("撤消(U)",'U');
		popupMenu_Redo=new JMenuItem("重做(R)",'R');
		popupMenu_Cut =new JMenuItem("剪切(T)",'T');
		popupMenu_Copy=new JMenuItem("复制(C)",'C');
		popupMenu_Paste=new JMenuItem("粘贴(P)",'P');
		popupMenu_Delete=new JMenuItem("删除(D)",'D');
		popupMenu_SelectAll=new JMenuItem("全选(A)",'A');		
	
		popupMenu_Undo.setEnabled(false);			//撤消选项初始设为不可用
		popupMenu_Redo.setEnabled(false);			//重做选项初始设为不可用
		
		//向右键菜单添加菜单项和分隔符
		popupMenu.add(popupMenu_Undo);
		popupMenu.add(popupMenu_Redo);
		popupMenu.addSeparator();
		popupMenu.add(popupMenu_Cut);
		popupMenu.add(popupMenu_Copy);		
		popupMenu.add(popupMenu_Paste);	
		popupMenu.add(popupMenu_Delete);
		popupMenu.addSeparator();
		popupMenu.add(popupMenu_SelectAll);
		
		//右键菜单注册事件
		popupMenu_Undo.addActionListener(this);
		popupMenu_Redo.addActionListener(this);
		popupMenu_Cut.addActionListener(this);
		popupMenu_Copy.addActionListener(this);
		popupMenu_Paste.addActionListener(this);
		popupMenu_Delete.addActionListener(this);
		popupMenu_SelectAll.addActionListener(this);
		
		//文本编辑区注册右键菜单事件
		editArea.addMouseListener(
			new MouseAdapter(){
				public void mousePressed(MouseEvent e)
				{
					checkForTriggerEvent(e);
				}				
				public void mouseReleased(MouseEvent e)
				{
					checkForTriggerEvent(e);
				}				
				private void checkForTriggerEvent(MouseEvent e)
				{
					if(e.isPopupTrigger())
						popupMenu.show(e.getComponent(),e.getX(),e.getY());
					editArea.requestFocus();	//编辑区获取焦点
				}				
			});																							
		//创建和添加状态栏
		statusLabel=new JLabel("　按F1获取帮助");
		container.add(statusLabel,BorderLayout.SOUTH);
		
		//改变标题栏窗口左侧默认图标	
		Toolkit tk=Toolkit.getDefaultToolkit();     
  		Image   image=tk.createImage("Icons/notepad.gif");   
  		this.setIconImage(image);
  		
  		//设置窗口在屏幕上的位置、大小和可见性 
		this.setLocation(100,100);
		this.setSize(650,550);
		this.setVisible(true);		
		editArea.requestFocus();			 	
	}					/*构造函数Notepad结束*/				
	//查找与替换功能
	public void mySearch(){		
		final JDialog findDialog=new JDialog(this,"查找与替换",true);	
		Container con=findDialog.getContentPane();
		con.setLayout(new FlowLayout(FlowLayout.LEFT));		
		JLabel searchContentLabel=new JLabel("查找内容(N) :");
		JLabel replaceContentLabel=new JLabel("替换为(P)　 :");
		final JTextField findText=new JTextField(30);
		final JTextField replaceText=new JTextField(30);
		final JCheckBox matchcase =new JCheckBox("区分大小写(C)");
		ButtonGroup bGroup=new ButtonGroup();
		final JRadioButton up=new JRadioButton("向上(U)");
		final JRadioButton down=new JRadioButton("向下(D)");
		down.setSelected(true);
		bGroup.add(up);
		bGroup.add(down);
		JButton searchNext=new JButton("查找下一个(F)");
		JButton replace=new JButton("替换(R)");
		final JButton replaceAll=new JButton("全部替换(A)");		
		//"替换"按钮的事件处理
		replace.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){				
				if(replaceText.getText().length() == 0 && editArea.getSelectedText()!=null) 
					editArea.replaceSelection(""); 
				if(replaceText.getText().length() > 0 && editArea.getSelectedText()!= null) 
					editArea.replaceSelection(replaceText.getText()); 
			}
		});		
		//"替换全部"按钮的事件处理
		replaceAll.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){				
				editArea.setCaretPosition(0);	//将光标放到编辑区开头	
				int a=0,b=0,replaceCount=0;					
				if(findText.getText().length()==0)
					{
						JOptionPane.showMessageDialog(findDialog,"请填写查找内容!","提示",JOptionPane.WARNING_MESSAGE);
						findText.requestFocus(true);
						return;
					}
				while( a > -1) { 
														 
					int FindStartPos=editArea.getCaretPosition();
					String str1, str2, str3, str4, strA, strB; 
					str1 = editArea.getText(); 
					str2 = str1.toLowerCase(); 
					str3 = findText.getText(); 
					str4 = str3.toLowerCase(); 
					
					if(matchcase.isSelected()) { 
						strA = str1; 
						strB = str3; 
					} 
					else { 
						strA = str2; 
						strB = str4; 
					} 
					
					if(up.isSelected()){						
						if(editArea.getSelectedText()==null){							
							a = strA.lastIndexOf(strB, FindStartPos-1);
						}
						else
						{
							a = strA.lastIndexOf(strB, FindStartPos-findText.getText().length()-1);	
						}
					}
					else if(down.isSelected())
						{
							if(editArea.getSelectedText()==null){
							a = strA.indexOf(strB, FindStartPos);
							}
							else
							{
							a=strA.indexOf(strB,FindStartPos-findText.getText().length()+1);
							}							
					}
					
					if(a > -1) { 
						if(up.isSelected()){
							editArea.setCaretPosition(a);
							b = findText.getText().length(); 
							editArea.select(a, a + b); 
							}
						else if(down.isSelected()){
							editArea.setCaretPosition(a); 
							b = findText.getText().length(); 
							editArea.select(a, a + b);
						}
					}			 
					else { 
						if(replaceCount==0){
							JOptionPane.showMessageDialog(findDialog, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE); 
						}
						else
						{
							JOptionPane.showMessageDialog(findDialog,"成功替换"+replaceCount+"个匹配内容!","替换成功",JOptionPane.INFORMATION_MESSAGE);
						}
					} 					
					if(replaceText.getText().length() == 0 && editArea.getSelectedText() != null){
						editArea.replaceSelection("");
						replaceCount++;
					} 
					
					if(replaceText.getText().length() > 0 && editArea.getSelectedText() != null) 
					{
						editArea.replaceSelection(replaceText.getText()); 
						replaceCount++;
					}
				}//end while
			}
		});	/*"替换全部"按钮的事件处理结束*/		
		//"查找下一个"按钮事件处理
		searchNext.addActionListener(new ActionListener(){
				
				public void actionPerformed(ActionEvent e){						
					int a = 0, b =0; 
					int FindStartPos=editArea.getCaretPosition();
					String str1, str2, str3, str4, strA, strB; 
					str1 = editArea.getText(); 
					str2 = str1.toLowerCase(); 
					str3 = findText.getText(); 
					str4 = str3.toLowerCase(); 											
					//"区分大小写"的CheckBox被选中
					if(matchcase.isSelected()) { 
						strA = str1; 
						strB = str3; 
					} 
					else { 
						strA = str2; 
						strB = str4; 
					} 				
					if(up.isSelected()){						
						if(editArea.getSelectedText()==null){							
							a = strA.lastIndexOf(strB, FindStartPos-1);
						}
						else{
						a = strA.lastIndexOf(strB, FindStartPos-findText.getText().length()-1);	
						}
					}
					else if(down.isSelected()){
							
						if(editArea.getSelectedText()==null){
							a = strA.indexOf(strB, FindStartPos);
						}
						else{
							a=strA.indexOf(strB,FindStartPos-findText.getText().length()+1);
						}							
					}					
					if(a > -1) { 
						if(up.isSelected()){
							editArea.setCaretPosition(a);
							b = findText.getText().length(); 
							editArea.select(a, a + b); 
						}
						else if(down.isSelected()){
							editArea.setCaretPosition(a); 
							b = findText.getText().length(); 
							editArea.select(a, a + b);
						}
					}
					else { 
						JOptionPane.showMessageDialog(null, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE); 
					} 
					
				}
		});/*"查找下一个"按钮事件处理结束*/
		
		//"取消"按钮及事件处理		
		JButton cancel=new JButton("取消");
		cancel.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent e){
					findDialog.dispose();
				}