GUI(习题-打开和保存文件)

2012-09-25
GUI(练习-打开和保存文件)
/* * 程序头部注释开始   * 程序的版权和版本声明部分   * Copyright (c) 2011, 烟台大学计算机学院学生   * All rights reserved.   * 文件名称：GUI(练习-打开和保存文件)                           * 作    者：薛广晨                               * 完成日期：2011  年 09 月  22  日   * 版 本号：x1.0               * 对任务及求解方法的描述部分   * 输入描述：  * 问题描述:    * 程序输出：   * 程序头部的注释结束 */package xue;import java.awt.*;import java.awt.event.*;import java.io.*;public class MyMenuTest {/** * @param args */private Frame f;private MenuBar bar;private TextArea ta;private Menu fileMenu;private MenuItem openItem, saveItem, closeItem;private FileDialog openDia, saveDia;private File file;MyMenuTest(){init();}public void init() {// TODO Auto-generated method stubf = new Frame("my window");f.setBounds(300, 100, 650, 600);bar = new MenuBar();ta = new TextArea();fileMenu = new Menu("文件");openItem = new MenuItem("打开");saveItem = new MenuItem("保存");closeItem = new MenuItem("退出");fileMenu.add(openItem);fileMenu.add(saveItem);fileMenu.add(closeItem);bar.add(fileMenu);f.setMenuBar(bar);openDia = new FileDialog(f, "我要打开", FileDialog.LOAD);saveDia = new FileDialog(f, "我要保存", FileDialog.SAVE);f.add(ta);myEvent();f.setVisible(true);}private void myEvent() {// TODO Auto-generated method stubsaveItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){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();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(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public static void main(String[] args) {// TODO Auto-generated method stubnew MyMenuTest();}}
运行结果：
GUI(习题-打开和保存文件)
上机感言：图形化界面好神奇啊，学了它才知道这么好玩
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GUI(习题-打开和保存文件)
