java 写的swing记事本

最近用java写的swing源代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Notepad3
{
	public static void main(String [] args)
	{
		Window mainWin = new Window("New - Notepad3");
	}
}

class Window extends JFrame implements ActionListener
{
	JMenuBar menubar;
	JTextArea mainText; 

	JFileChooser openFile;
	JFileChooser saveFile;

	JPopupMenu contextMenu;
	JMenuItem popupcopy, popupcut, popuppaste, popupdel;

	JMenu file;
	JMenuItem New, Open, Save, SaveAs, NewWindow, Encode, Exit;

	JMenu edit;
	JMenuItem redo, undo, cut, copy, paste, del, find, findNext, replace; 
	String findStr = null; // 要查找的字符串-findStr

	JMenu help;
	JMenuItem about;

	JMenu view;
	JMenuItem font, linenum, wordCounts;
	JCheckBoxMenuItem wordWrap;

	//mainText上方的按钮，没有用处的
	JButton buttonRun, buttonRun2;
	Icon icon1;

	//在mainText下面添加状态栏；
	JLabel wordCount;

	Window(String s)
	{
		setTitle(s);
		setBounds(100,100,800,600);
		setVisible(true);
		setResizable(true);
		{
			//添加工具栏
			menubar = new JMenuBar();
			//添加菜单-文件
			file = new JMenu("File");
			New = new JMenuItem("New", new ImageIcon("new.gif"));
			Open = new JMenuItem("Open", new ImageIcon("open.gif"));
			Save = new JMenuItem("Save", new ImageIcon("save.gif"));
			SaveAs = new JMenuItem("Save as", new ImageIcon("saveas.gif"));
			NewWindow= new JMenuItem("New Window", new ImageIcon("newwindow.gif"));
			Encode = new JMenuItem("Encode", new ImageIcon("encode.gif"));
			Exit= new JMenuItem("Exit", new ImageIcon("exit.gif"));
			New.setMnemonic('N');//为“新建”设置快捷键Ctrl+N		
			New.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));  

			Open.setAccelerator(KeyStroke.getKeyStroke('O'));
			//		menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
			openFile = new JFileChooser("d:/"); //打开文件夹的对象
			file.add(New);
			file.add(Open);
			file.addSeparator();
			file.add(Save);
			file.add(SaveAs);
			file.addSeparator();
			file.add(NewWindow);
			file.add(Encode);
			file.add(Exit);
			New.addActionListener(this);
			Open.addActionListener(this);
			Save.addActionListener(this);

			//添加菜单-编辑
			edit= new JMenu("Edit");
			redo = new JMenuItem("Redo");
			undo = new JMenuItem("Undo");
			cut = new JMenuItem("Cut");
			copy = new JMenuItem("Copy");
			paste = new JMenuItem("Paste");
			del= new JMenuItem("Delete");
			find = new JMenuItem("Find");
			findNext = new JMenuItem("FindNext");
			replace = new JMenuItem("Replace");
			edit.add(redo);
			edit.add(undo);
			edit.addSeparator();
			edit.add(cut);
			edit.add(copy);
			edit.add(paste);
			edit.add(del);
			edit.addSeparator();
			edit.add(find);
			edit.add(findNext);
			edit.add(replace);
			copy.addActionListener(this);
			cut.addActionListener(this);
			paste.addActionListener(this);
			del.addActionListener(this);
			find.addActionListener(this);
			findNext.addActionListener(this);
			replace.addActionListener(this);

			//添加菜单-View
			view = new JMenu("View");
			font = new JMenuItem("Font");
			wordWrap = new JCheckBoxMenuItem("Word Wrap", false);
			linenum = new JMenuItem("Line Numbers");
			wordCounts= new JMenuItem("Word Counts");
			view.add(font);
			view.add(wordWrap);
			view.addSeparator();
			view.add(linenum);
			view.add(wordCounts);
			wordCounts.addActionListener(this);
			wordWrap.addActionListener(this);

			//添加菜单-Help
			help = new JMenu("Help");
			about = new JMenuItem("About");
			help.add(about);
			about.addActionListener(this);

			//添加到菜单栏
			menubar.add(file);
			menubar.add(edit);
			menubar.add(view);
			menubar.add(help);
			setJMenuBar(menubar);
		}
		//添加文本区域
		mainText = new JTextArea("haha");
		//添加文本区域到窗口，并增加滚动条
		add(new JScrollPane(mainText), BorderLayout.CENTER);
		//右键显示的监听事件
		mainText.addMouseListener(new MouseAdapter(){
			public void mousePressed(MouseEvent e){
				if(e.getModifiers()==InputEvent.BUTTON3_MASK)
			contextMenu.show(mainText,e.getX(),e.getY());
			}
		});
		//添加右键菜单项目
		JPopupMenu contextMenu = new JPopupMenu();
		popupcopy = new JMenuItem("copy");
		popupcut = new JMenuItem("cut");
		popuppaste = new JMenuItem("paste");
		popupdel = new JMenuItem("Delete");
		contextMenu.add(popupcut);
		contextMenu.add(popupcopy);
		contextMenu.add(popuppaste);
		contextMenu.add(popupdel);
		popupcopy.addActionListener(this);
		popupcut.addActionListener(this);
		popuppaste.addActionListener(this);
		popupdel.addActionListener(this);

		icon1= new ImageIcon("a.jag");
		buttonRun = new JButton(icon1);
		buttonRun.setMnemonic('d');
		add(buttonRun,BorderLayout.NORTH);
		buttonRun.addActionListener(this);

		wordCount = new JLabel("本文共" + mainText.getText().length() + "个字");
		add(wordCount,BorderLayout.SOUTH);

		validate();
		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
	}
	public void actionPerfoemed(ActionEvent e)
	{
		int i=0;
		i=(i+1)%2;
		if(i==1)
			buttonRun.setIcon(icon1);
	}
	//文本区域的监听事件
	public void actionPerformed(ActionEvent e)
	{
		if (e.getSource()==copy || e.getSource()==popupcopy)
			mainText.copy();
		else if (e.getSource()==cut || e.getSource()==popupcut)
			mainText.cut();
		else if (e.getSource()==paste || e.getSource()==popuppaste)
			mainText.paste();
		else if (e.getSource()==wordCounts)
			wordCount.setText("本文共" + mainText.getText().length() + "个字");
		else if (e.getSource()==about)
			JOptionPane.showConfirmDialog(this, "\n          Power By Yantze\n     mail:yantze@126.com", "关于", JOptionPane.CLOSED_OPTION );
		else if (e.getSource()==wordWrap)
			mainText.setLineWrap(!mainText.getLineWrap()); 
		else if (e.getSource()==del || e.getSource() == popupdel)
			mainText.replaceRange("",mainText.getSelectionStart(),mainText.getSelectionEnd()); //删除选中的文本
		else if (e.getSource()==find || e.getSource()==findNext)//实现查找和查找下一个的功能
		{
			if(findStr==null || e.getSource()==find )
			{ 
				findStr= JOptionPane.showInputDialog(this, "请输入要找的字符串(Regex-open)!"); 
				if ((findStr!=null)&&!mainText.equals(""))
				{ 
					int position =mainText.getText().indexOf(findStr); 
					if(position!=-1)
					{
						mainText.setSelectionStart(position); 
						mainText.setSelectionEnd(position + findStr.length()); 
					} 
					else JOptionPane.showMessageDialog(this, "未查找到字符串！"); 
				}
			}
			else
			{ 
				if ((findStr!=null)&&!findStr.equals(""))
				{
					int position = mainText.getText().indexOf(findStr, mainText.getSelectionStart()+1) ; 
					if(position!=-1){ 
						mainText.setSelectionStart(position); 
						mainText.setSelectionEnd(position+findStr.length()); 
					} 
					else JOptionPane.showMessageDialog(this, "不存在要查找的字符串！");    
				}
			}
		}
		else if(e.getSource()==replace){
			findStr = null; 
			String replaceStr; 
			String str; 
			findStr= JOptionPane.showInputDialog(this, "请输入替换的字符串!(Regex-open)"); 
			if ((findStr!=null)&&!mainText.equals("")){ 
				int position =mainText.getText().indexOf(findStr); 
				if(position!=-1){ 
					mainText.setSelectionStart(position); 
					mainText.setSelectionEnd(position+findStr.length()); 
					replaceStr = JOptionPane.showInputDialog(this,"请输入替换的字符串!"); 
					if(replaceStr!=null){ 
						str = mainText.getText().replace(findStr, replaceStr); 
						mainText.setText(str); 
					} 
				} 
				else JOptionPane.showMessageDialog(this, "没有你要替换的字符串"); 
			}
			else 
				JOptionPane.showMessageDialog(this, "没有你想替换的的字符！"); 
		} 
		else if (e.getSource()==New)
		{
			int n=JOptionPane.showConfirmDialog(this,"在新建之前,想保存文件吗?","新建文档",JOptionPane.YES_NO_CANCEL_OPTION);
			if(n == JOptionPane.YES_OPTION)
			{
				mainText.setText(null);
			}
			if(n == JOptionPane.NO_OPTION)
			{
				mainText.setText(null);
			}
		}
		else if (e.getSource()==Open)
		{
			int n = openFile.showOpenDialog(null);
			if (n == JFileChooser.APPROVE_OPTION) //这段代码用到了java.io.*;
			{
				File file = openFile.getSelectedFile();
				try
				{
					FileReader readFile = new FileReader(file);
					BufferedReader in = new BufferedReader(readFile);
					String s = null;
					while ((s=in.readLine()) != null)
						mainText.append(s + "\n");
				}
				catch(IOException ee){}
			}
		}
		else if (e.getSource()==Save)
		{
			/*
			   saveFile = new JFileChooser();
			   saveFile .setApproveButtonText("确定");
			   saveFile .setDialogTitle("另存为");
			   int result = saveFile.showSaveDialog(this);
			   if (result == JFileChooser.CANCEL_OPTION) {
			   statusLabel.setText("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(mainText.getText(), 0, mainText.getText().length());
			   bfw.flush();
			   fw.close();
			   isNewfile = false;
			   file = saveFileName;
			   oldValue = tex.getText();
			   statusLabel.setText("　当前打开文件:" + saveFileName.getAbsoluteFile());
			   } catch (IOException ioException) {
			   }
			   }
			   */
			try{
				int result = saveFile.showSaveDialog(this);
				saveFile.setApproveButtonText("确定");
				File save = saveFile.getSelectedFile();
				FileWriter writeOut = new FileWriter(save);
				writeOut.write(mainText.getText());
				writeOut.flush();
				writeOut.close();
			}catch (IOException eee){
				System.out.println("Error writing file");
			}
		}
	}
}

　　效果图：