import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
 
/*dkplus专业搜集和编写实用电脑软件教程，
*搜集各种软件资源和计算机周边，独立制作视频和ppt和音频微信公众号，
*点击进入 dkplus官方博客 （java网络编程http://dkplus.iteye.com），
*微信搜索dkplus关注公众号可获取海量计算机周边资源。*/
 
//简单的文本编辑器
 
public class EditorDemo extends JFrame {
    JTextPane textPane = new JTextPane(); //文本窗格，编辑窗口
    JLabel statusBar = new JLabel(); //状态栏
    JFileChooser filechooser = new JFileChooser(); //文件选择器
 
    public EditorDemo() { //构造函数
        super("简单的文本编辑器");  //调用父类构造函数
 
        Action[] actions =  //Action数组,各种操作命令
            {
                new NewAction(),
                new OpenAction(),
                new SaveAction(),
                new CutAction(),
                new CopyAction(),
                new PasteAction(),
                new AboutAction(),
                new ExitAction()};
 
        setJMenuBar(createJMenuBar(actions));  //设置菜单栏
        Container container = getContentPane(); //得到容器
        container.add(createJToolBar(actions), BorderLayout.NORTH); //增加工具栏
        container.add(textPane, BorderLayout.CENTER); //增加文本窗格
        container.add(statusBar, BorderLayout.SOUTH); //增加状态栏
 
        setSize(330, 200); //设置窗口尺寸
        setVisible(true);  //设置窗口可视
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  //关闭窗口时退出程序
    }
 
    private JMenuBar createJMenuBar(Action[] actions) {  //创建菜单栏
        JMenuBar menubar = new JMenuBar(); //实例化菜单栏
        JMenu menuFile = new JMenu("文件"); //实例化菜单
        JMenu menuEdit = new JMenu("编辑");
        JMenu menuAbout = new JMenu("帮助");
        menuFile.add(new JMenuItem(actions[0])); //增加新菜单项
        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]));
        menubar.add(menuFile); //增加菜单
        menubar.add(menuEdit);
        menubar.add(menuAbout);
        return menubar; //返回菜单栏
    }
 
    private JToolBar createJToolBar(Action[] actions) { //创建工具条
        JToolBar toolBar = new JToolBar(); //实例化工具条
        for (int i = 0; i < actions.length; i++) { 
            JButton bt = new JButton(actions[i]); //实例化新的按钮
            bt.setRequestFocusEnabled(false); //设置不需要焦点
            toolBar.add(bt); //增加按钮到工具栏
        }
        return toolBar;  //返回工具栏
    }
 
    class NewAction extends AbstractAction { //新建文件命令
        public NewAction() {
            super("新建");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.setDocument(new DefaultStyledDocument()); //清空文档
        }
    }
 
    class OpenAction extends AbstractAction { //打开文件命令
        public OpenAction() {
            super("打开");
        }
        public void actionPerformed(ActionEvent e) {
            int i = filechooser.showOpenDialog(EditorDemo.this); //显示打开文件对话框
            if (i == JFileChooser.APPROVE_OPTION) { //点击对话框中打开选项
                File f = filechooser.getSelectedFile(); //得到选择的文件
                try {
                    InputStream is = new FileInputStream(f); //得到文件输入流
                    textPane.read(is, "d"); //读入文件到文本窗格
                } catch (Exception ex) {
                    ex.printStackTrace();  //输出出错信息
                }
            }
        }
    }
 
    class SaveAction extends AbstractAction {  //保存命令
        public SaveAction() {
            super("保存");
        }
        public void actionPerformed(ActionEvent e) {
            int i = filechooser.showSaveDialog(EditorDemo.this); //显示保存文件对话框
            if (i == JFileChooser.APPROVE_OPTION) {  //点击对话框中保存按钮
                File f = filechooser.getSelectedFile(); //得到选择的文件
                try {
                    FileOutputStream out = new FileOutputStream(f);  //得到文件输出流
                    out.write(textPane.getText().getBytes()); //写出文件                
                } catch (Exception ex) {
                    ex.printStackTrace(); //输出出错信息
                }
            }
        }
    }
 
    class ExitAction extends AbstractAction { //退出命令
        public ExitAction() {
            super("退出");
        }
        public void actionPerformed(ActionEvent e) {
            System.exit(0);  //退出程序
        }
    }
 
    class CutAction extends AbstractAction {  //剪切命令
        public CutAction() {
            super("剪切");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.cut();  //调用文本窗格的剪切命令
        } 
    }
 
    class CopyAction extends AbstractAction {  //拷贝命令
        public CopyAction() {
            super("拷贝");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.copy();  //调用文本窗格的拷贝命令
        }
    }
 
    class PasteAction extends AbstractAction {  //粘贴命令
        public PasteAction() {
            super("粘贴");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.paste();  //调用文本窗格的粘贴命令
        }
    }
 
    class AboutAction extends AbstractAction { //关于选项命令
        public AboutAction() {
            super("关于");
        }
        public void actionPerformed(ActionEvent e) {
            JOptionPane.showMessageDialog(EditorDemo.this, "简单的文本编辑器演示"); //显示软件信息
        }
    }
 
    public static void main(String[] args) {
        new EditorDemo();
    }
 
}