import java.awt.*;

 import java.awt.event.*;

 import java.io.*;

 class MyMenu

 {

     //定义该窗体所需的组件，方便其他函数引用

     private Frame f;

     private Button btn;  //按钮

     private Button btn1;

     private Label label; //标签

     private TextArea ta ; //文本区域

     private Menu fileMenu; //菜单

     private MenuBar bar;

     private MenuItem openItem,saveItem,closeItem; //子菜单

     private FileDialog openDia,saveDia; //文件对话框

     private File file; //文件

     //构造器

     MyMenu(){

         init();

     }

     public void init(){

         f = new Frame("我的窗体及菜单框架");

         /*（所有静态属性设置)*/

         //对窗体进行基本设置

         f.setBounds(100,50,1200,1000);

         f.setLayout(new FlowLayout());

         f.setBackground(Color.gray);

         //组件(自定义)

         btn      = new Button("退出");

         btn1  = new Button("按钮1");

         label = new Label("这是一个文本",Label.CENTER);

         ta = new TextArea("test",30,70,1);//最后一个参数设置为显示滚动条，1显示垂直滚动条，2显示横向滚动条，0全部显示。

         bar = new MenuBar();

         fileMenu = new Menu("文件");

         //定义菜单项

         openItem = new MenuItem("打开");

         saveItem = new MenuItem("保存");

         closeItem = new MenuItem("退出");

         //将菜单项添加进菜单

         fileMenu.add(openItem);

         fileMenu.add(saveItem);

         fileMenu.addSeparator();

         fileMenu.add(closeItem);

          //将菜单已添加进菜单栏

         bar.add(fileMenu);

         f.setMenuBar(bar);

         //添加文件对话框

         openDia = new FileDialog(f,"我要打开",FileDialog.LOAD);

         saveDia = new FileDialog(f,"我要保存",FileDialog.SAVE);

         //组件属性设置

         label.setBackground(Color.pink);

         label.setFont(new Font("Dialog", Font.BOLD, 12));

         label.setSize(300,200);

         //将组件添加到frame中

         f.add(label);

         f.add(ta);

         f.add(btn);

         f.add(btn1);

         //加载窗体事件（所有响应事件)

         myEvent();

         //显示窗体

         f.setVisible(true);

     }

     private void myEvent(){

         /*规则：

           xxxListener(new xxxAdapter())

                     xxxEvent e

         */

         //窗体关闭事件

         f.addWindowListener(new WindowAdapter()

         {

             public void windowClosing(WindowEvent e)

             {

                 System.exit(0);

             }

         });

         //按钮响应事件

         btn.addActionListener(new ActionListener(){

             public void actionPerformed(ActionEvent e)

             {

                 //按钮响应

                 System.out.println("退出，按钮干的");

                 System.exit(0);

             }

         });

         //按钮1响应事件

         btn1.addActionListener(new ActionListener(){

             public void actionPerformed(ActionEvent e)

             {

                 //获取文本内容并显示

                 String taContent =ta.getText();

                 label.setText(taContent);

             }

         });

         //菜单事件：添加保存活动监听，

         saveItem.addActionListener(new ActionListener()

         {

             public void actionPerformed(ActionEvent e)

             {

                 //保存就是直接开启对话框

                 //if(file==null)

                 //{

                     saveDia.setVisible(true);

                     String dirPath = saveDia.getDirectory();

                     String fileName = saveDia.getFile();

                     if(dirPath==null || fileName==null)

                         return ;

                     file = new File(dirPath,fileName);

                 //}

                 try

                 {

                     BufferedWriter bufw  = new BufferedWriter(new FileWriter(file));

                     String text = ta.getText();

                     bufw.write(text);

                     //bufw.flush();

                     bufw.close();

                 }

                 catch (IOException ex)

                 {

                     throw new RuntimeException();

                 }

             }

         });

         openItem.addActionListener(new ActionListener()

         {

             public void actionPerformed(ActionEvent e)

             {

                 openDia.setVisible(true);

                 String dirPath = openDia.getDirectory();

                 String fileName = openDia.getFile();

 //                System.out.println(dirPath+"..."+fileName);

                 if(dirPath==null || fileName==null)

                     return ;

                 ta.setText("");

                 file = new File(dirPath,fileName);

                 try

                 {

                     BufferedReader bufr = new BufferedReader(new FileReader(file));

                     String line = null;

                     while((line=bufr.readLine())!=null)

                     {

                         ta.append(line+"\r\n");

                     }

                     bufr.close();

                 }

                 catch (IOException ex)

                 {

                     throw new RuntimeException("读取失败");

                 }

             }

         });

         closeItem.addActionListener(new ActionListener()

         {

             public void actionPerformed(ActionEvent e)

             {

                 System.exit(0);

             }

         });

     }

     public static void main(String[] args){

         new MyMenu();

     }

 }