java.awt: 自定义的简单记事本

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package com.guiAWT;     import java.awt.FileDialog; import java.awt.Frame; import java.awt.Menu; import java.awt.MenuBar; import java.awt.MenuItem; import java.awt.TextArea; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;   /***  * java.awt: 自定义的简单记事本  * @author caojsvm  *  */ public class MyJavaNotepad {     private final String frameName = "MyFrame";     private Frame f;     private TextArea ta;           private MenuBar menuBar;     private Menu menu;     private MenuItem menuItemExit;     private MenuItem menuItemOpen,menuItemSave,menuItemSaveAs;           private FileDialog openDg,saveDg;           private File file;     public MyJavaNotepad() {         //初始化         init();     }                 //初始化参数     private void init() {         this.f = new Frame(frameName);                   /*************对Frame进行基本设置****************/         //设置位置坐标、窗口大小: void setBounds(int x, int y, int width, int height)         this.f.setBounds(600, 100, 800, 900);           //使用默认布局管理器，不做更改                             //初始化TextArea文本区域         ta = new TextArea(50,100);                   //初始化菜单栏         menuBar = new MenuBar();         //初始化菜单         menu = new Menu("File");                   //初始化二级菜单         menuItemOpen = new MenuItem("open file...");         menuItemExit = new MenuItem("exit");         menuItemSave = new MenuItem("save file");         menuItemSaveAs = new MenuItem("save as...");                   //建立关系         //添加二级菜单         menu.add(menuItemOpen);         menu.add(menuItemSave);         menu.add(menuItemSaveAs);         menu.add(menuItemExit);                             //添加菜单         menuBar.add(menu);                   //窗体中添加菜单栏         this.f.setMenuBar(menuBar);                   //添加组件         this.f.add(ta);                             //加载窗体及组件的事件         frameEvent();                   //显示窗口         this.f.setVisible(true);               }           /***      * 给窗体和组件添加事件      */     private void frameEvent() {         //给窗体添加事件         //查阅Frame类的父类Window的方法找到添加监听方法         //查阅WindowListener监听API发现，这个接口有很多方法，所以找其适配器（实现类）WindowAdapter。         //一般接口超过3个方法，都会有对应的适配器。         this.f.addWindowListener(                 new WindowAdapter() {                     //关闭窗口                     public void windowClosing(WindowEvent e) {                         System.out.println("关闭窗口");                         System.exit(0);                     }                 }         );                   //菜单事件         this.menuItemExit.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 System.out.println("点击菜单---exit...关闭窗口退出程序");                 System.exit(0);             }         });                   //菜单打开文件事件         this.menuItemOpen.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 System.out.println("点击菜单---open...打开文件");                 //加载打开文本框                 openFileDialogInit();                                   //显示打开文件框                 openDg.setVisible(true);                                   //把FileDialog中选中的文件显示在TextArea文本区域中                 openFile();             }         });                             //菜单保存文件事件         this.menuItemSave.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 System.out.println("点击菜单---save...保存文件");                 saveFileDialogInit();                                   saveFile();             }         });                   //菜单另存文件事件         this.menuItemSaveAs.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 System.out.println("点击菜单---save as...保存文件");                 saveFileDialogInit();                                   saveAsFile();             }         });     }                 /**      * 初始化文件对话框      * public FileDialog(Frame parent,String title,int mode)      *   参数：      *    parent - 对话框的所有者      *    title - 对话框的标题      *    mode - 对话框的模式，可以是 FileDialog.LOAD 或 FileDialog.SAVE      */     private void openFileDialogInit(){         openDg = new FileDialog(this.f, "open File...");     }           /**      * 初始化文件对话框      */     private void saveFileDialogInit(){         saveDg = new FileDialog(this.f, "save File...",FileDialog.SAVE);     }                 /**      * 把打开的文件显示在文本区域中      */     private void openFile(){         //获取文件路径         String dir = openDg.getDirectory();         //System.out.println(dir);         //获取文件名         String fileName = openDg.getFile();         //System.out.println(fileName);                   //由于点取消时，目录或文件名可能为空，会导致后面创建File对象时出现异常         //因此要在这里做判断         if(dir == null || fileName == null){             return ;         }                   //读取文件         file = new File(dir,fileName);         //System.out.println(file);         BufferedReader buffr = null;         try {             //先清空一下文本区域，防止每次打开文件都追加到上次文件的后面             this.ta.setText("");                           buffr = new BufferedReader(new FileReader(file));             String str = null;             while((str = buffr.readLine()) != null){                 this.ta.append(str+"\r\n");             }             //回显目录             this.f.setTitle(frameName+" : "+file.toString());         } catch (FileNotFoundException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         } finally{             try {                 if(buffr != null){                     buffr.close();                 }             } catch (Exception e2) {                 e2.printStackTrace();             }         }               }           /**      * 把文本区域中的内容保存到所选文件中      */     private void saveFile(){                   System.out.println("file="+file);                   if(file == null){                       saveDg.setVisible(true);                           //获取文件路径             String dir = saveDg.getDirectory();             //System.out.println(dir);             //获取文件名             String fileName = saveDg.getFile();             //System.out.println(fileName);                           //由于点取消时，目录或文件名可能为空，会导致后面创建File对象时出现异常             //因此要在这里做判断             if(dir == null || fileName == null){                 return ;             }                           //读取文件             file = new File(dir,fileName);         }         //System.out.println(file);         BufferedWriter buffw = null;         try {             String str = this.ta.getText();             buffw = new BufferedWriter(new FileWriter(file));             buffw.write(str);                           buffw.flush();                           System.out.println("保存文件成功");             //回显目录             this.f.setTitle(frameName+" : "+file.toString());         } catch (FileNotFoundException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         } finally{             try {                 if(buffw != null){                     buffw.close();                 }             } catch (Exception e2) {                 e2.printStackTrace();             }         }                         }           /**      * 把文本区域中的内容另存到所选文件中      */     private void saveAsFile(){         saveDg.setVisible(true);                   //获取文件路径         String dir = saveDg.getDirectory();         //System.out.println(dir);         //获取文件名         String fileName = saveDg.getFile();         //System.out.println(fileName);                   //由于点取消时，目录或文件名可能为空，会导致后面创建File对象时出现异常         //因此要在这里做判断         if(dir == null || fileName == null){             return ;         }                   //读取文件         file = new File(dir,fileName);               //System.out.println(file);         BufferedWriter buffw = null;         try {             String str = this.ta.getText();             buffw = new BufferedWriter(new FileWriter(file));             buffw.write(str);                           buffw.flush();                           System.out.println("保存文件成功");                           //回显目录             this.f.setTitle(frameName+" : "+file.toString());         } catch (FileNotFoundException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         } finally{             try {                 if(buffw != null){                     buffw.close();                 }             } catch (Exception e2) {                 e2.printStackTrace();             }         }     }                 /**      * @param args      */     public static void main(String[] args) {         new MyJavaNotepad();     }   }