用Java实现文本编辑器

大家好，又见面了，我是你们的朋友全栈君。

源码里有注释：

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;

//简单的文本编辑器

public class Editor extends JFrame {
	public JTextPane textPane = new JTextPane(); //文本窗格d，编辑窗口
	public JFileChooser filechooser = new JFileChooser(); //文件选择器

	public Editor()
	{
		super("简记");
		
		Action[] actions=			//菜单项的各种功能
			{
					new NewAction(),
					new OpenAction(),
					new SaveAction(),
					new CutAction(),
					new CopyAction(),
					new PasteAction(),
					new AboutAction(),
					new ExitAction(),
					new HelpAction()
			};
		setJMenuBar(createJMenuBar(actions));		//根据actions创建菜单栏
		Container container=getContentPane();		
		container.add(textPane, BorderLayout.CENTER);
		
		setSize(1300,1500);
		setVisible(true);
	//	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	private JMenuBar createJMenuBar(Action[] actions)	//创建菜单栏的函数
	{
		JMenuBar menubar=new JMenuBar();
		JMenu menuFile=new JMenu("文件(F)");
		JMenu menuEdit=new JMenu("编辑(E)");
		JMenu menuAbout=new JMenu("帮助(H)");
		menuFile.add(new JMenuItem(actions[0]));
		menuFile.add(new JMenuItem(actions[1]));
		menuFile.add(new JMenuItem(actions[2]));
		menuFile.add(new JMenuItem(actions[7]));
		menuEdit.add(new JMenuItem(actions[3]));
		menuEdit.add(new JMenuItem(actions[4]));
		menuEdit.add(new JMenuItem(actions[5]));
		menuAbout.add(new JMenuItem(actions[6]));
		menuAbout.add(new JMenuItem(actions[8]));
		menubar.add(menuFile);
		menubar.add(menuEdit);
		menubar.add(menuAbout);
		return menubar;
	}

	class NewAction extends AbstractAction		//新建
	{
		public NewAction()
		{
			super("新建(N)     Ctrl+N");
		}
		public void actionPerformed(ActionEvent e)
		{
			textPane.setDocument(new DefaultStyledDocument());
		}
	}

	class OpenAction extends AbstractAction		//打开
	{
		public OpenAction()
		{
			super("打开(O)     Ctrl+O");
		}
		public void actionPerformed(ActionEvent e)
		{
			int i=filechooser.showOpenDialog(Editor.this);			//显示打开文件对话框
			if(i==JFileChooser.APPROVE_OPTION)			//点击对话框打开选项
			{
				File f=filechooser.getSelectedFile();	//得到选择的文件
				try
				{
					InputStream is=new FileInputStream(f);
					textPane.read(is, "d");
				}
				catch(Exception ex)
				{
					ex.printStackTrace();
				}
			}
		}
	}

	class SaveAction extends AbstractAction		//保存
	{
		public SaveAction()
		{
			super("保存(S)     Ctrl+S");
		}
		public void actionPerformed(ActionEvent e)
		{
			int i=filechooser.showSaveDialog(Editor.this);
			if(i==JFileChooser.APPROVE_OPTION)
			{
				File f=filechooser.getSelectedFile();
				try
				{
					FileOutputStream out=new FileOutputStream(f);
					out.write(textPane.getText().getBytes());
				}
				catch(Exception ex)
				{
					ex.printStackTrace();
				}
			}
		}
	}

	class ExitAction extends AbstractAction		//退出
	{
		public ExitAction()
		{
			super("退出(X)");
		}
		public void actionPerformed(ActionEvent e)
		{
			dispose();
		}
	}

	class CutAction extends AbstractAction		//剪切
	{
		public CutAction()
		{
			super("剪切(T)     Ctrl+X");
		}
		public void actionPerformed(ActionEvent e)
		{
			textPane.cut();
		}
	}
	
	class CopyAction extends AbstractAction		//复制
	{
		public CopyAction()
		{
			super("复制(C)     Ctrl+C");
		}
		public void actionPerformed(ActionEvent e)
		{
			textPane.copy();
		}
	}

	class PasteAction extends AbstractAction		//粘贴
	{
		public PasteAction()
		{
			super("粘贴(P)     Ctrl+V");
		}
		public void actionPerformed(ActionEvent e)
		{
			textPane.paste();
		}
	}

	class AboutAction extends AbstractAction
	{
		public AboutAction()
		{
			super("关于简记(A)");
		}
		public void actionPerformed(ActionEvent e)
		{
			JOptionPane.showMessageDialog(Editor.this,"实现了记事本的一些基本功能","关于",JOptionPane.PLAIN_MESSAGE);
		}
	}
	
	class HelpAction extends AbstractAction
	{
		public HelpAction()
		{
			super("联系开发者");
		}
		public void actionPerformed(ActionEvent e)
		{
			JOptionPane.showMessageDialog(Editor.this,"cpeng2424@gmail.com","开发者邮箱",JOptionPane.PLAIN_MESSAGE);
		}
	}
	
	public static void main(String[] args)
	{
		new Editor();
	}
}