基于Java的Notebook源码Java记事本源码

/** * Copyright 2009 ChinaSoft International Ltd. All rights reserved. */ package com.chinasofti.notebook; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.io.*; import javax.swing.event.*; import javax.print.*; import javax.print.attribute.*; import java.util.*; import java.text.*; /** * MyNotebook 示例 * * @author Martin * @version 1.0 2009-10-30 */ public class MyNotebook extends JFrame implements ActionListener { Container con; JScrollPane JSPane; JTextArea text; JMenuBar mainMenuBar; JMenu fileMenu, editMenu, formatMenu, helpMenu; JMenuItem newItem, openItem, saveItem, saveasItem, pageItem, printItem, exitItem; JMenuItem undoItem, cutItem, copyItem, pasteItem, findItem, replaceItem, selectallItem, dateItem; JCheckBoxMenuItem wrapItem; JMenuItem fontItem; JMenuItem helpItem, aboutItem; boolean changed = false; boolean haveName = false; File file = null; //主程序入口 public static void main(String[] args) { MyNotebook notbook = new MyNotebook(); notbook.setVisible(true); } //创建界面、安装各种监听器、 public MyNotebook() { setTitle("记事本 -- 未命名"); con = getContentPane(); text = new JTextArea(); JSPane = new JScrollPane(text); createMenu(); setJMenuBar(mainMenuBar); con.add(JSPane, BorderLayout.CENTER); java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize(); setBounds((screenSize.width - 800) / 2, (screenSize.height - 600) / 2, 800, 600); } //创建主菜单 public void createMenu() { //创建JMenuBar mainMenuBar = new JMenuBar(); //创建四个JMenu fileMenu = new JMenu("文件"); editMenu = new JMenu("编辑"); formatMenu = new JMenu("格式"); helpMenu = new JMenu("帮助"); //创建JMenuItem并添加到对应的JMenu中 mainMenuBar.add(fileMenu); newItem = new JMenuItem("新建"); openItem = new JMenuItem("打开.."); saveItem = new JMenuItem("保存.."); saveasItem = new JMenuItem("另存为.."); pageItem = new JMenuItem("页面设置.."); printItem = new JMenuItem("打印.."); exitItem = new JMenuItem("退出"); fileMenu.add(newItem); fileMenu.add(openItem); fileMenu.add(saveItem); fileMenu.add(saveasItem); fileMenu.addSeparator(); fileMenu.add(pageItem); fileMenu.add(printItem); fileMenu.addSeparator(); fileMenu.add(exitItem); mainMenuBar.add(helpMenu); helpItem = new JMenuItem("帮助主题"); aboutItem = new JMenuItem("关于.."); helpMenu.add(helpItem); helpMenu.add(aboutItem); exitItem.addActionListener(this); saveItem.addActionListener(this); saveasItem.addActionListener(this); newItem.addActionListener(this); printItem.addActionListener(this); openItem.addActionListener(this); } public void actionPerformed(ActionEvent e) { Object obj; obj = e.getSource(); if (obj == exitItem) { doExit(); } else if (obj == saveItem) { doSave(); } else if (obj == saveasItem) { doSaveAs(); } else if (obj == newItem) { doNewFile(); } else if (obj == openItem) { doOpen(); } } //当用户按下窗口的“关闭”时，会自动调用此方法 protected void processWindowEvent(WindowEvent e) { if (e.getID() == WindowEvent.WINDOW_CLOSING) { doExit(); } } //程序退出时的代码 void doExit() { int select; if (!changed) { System.exit(0); } else { select = JOptionPane.showConfirmDialog(this, "文件修改后尚未存盘，要保存吗？"); switch (select) { case JOptionPane.YES_OPTION: select = doSave(); if (select == 1) { System.exit(0); } break; case JOptionPane.NO_OPTION: System.exit(0); break; case JOptionPane.CANCEL_OPTION: break; } } } //保存用户编辑的文件，保存成功返回1，否则返回0 int doSave() { FileOutputStream fout; byte content[]; int flag; if (!haveName) { flag = doSaveAs(); } else if (changed) { try { fout = new FileOutputStream(file); content = text.getText().getBytes(); fout.write(content); fout.close(); changed = false; JOptionPane.showMessageDialog(this, "保存成功！"); flag = 1; } catch (FileNotFoundException e) { JOptionPane.showMessageDialog(this, "指定的文件名称或属性有问题！"); flag = 0; } catch (IOException e) { JOptionPane.showMessageDialog(this, "无法写文件，请检查文件是否被锁定"); flag = 0; } } else { JOptionPane.showMessageDialog(this, "保存成功，其他情况！"); flag = 1; } return flag; } //用"另存为"对话框保存文件。保存成功返回1，否则返回0 int doSaveAs() { FileOutputStream fout; byte content[]; int flag = 0; File tmpfile = null; ExampleFileFilter filter = new ExampleFileFilter(); JFileChooser chooser; filter.addExtension("txt"); filter.setDescription("文本文件"); if (file != null) { chooser = new JFileChooser(file.getPath()); } else { chooser = new JFileChooser(); } chooser.setFileFilter(filter); flag = chooser.showSaveDialog(this); if (flag == JFileChooser.APPROVE_OPTION) { tmpfile = chooser.getSelectedFile(); if (tmpfile.exists()) { if (JOptionPane.showConfirmDialog(this, "文件已经存在，是否覆盖？", "警告", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION) { flag = 1; } else { flag = 0; } } else { flag = 1; } } else { flag = 0; } if (flag == 1) {//用户已经确定要以指定名称保存文件 try { fout = new FileOutputStream(tmpfile); content = text.getText().getBytes(); fout.write(content); fout.close(); flag = 1; } catch (FileNotFoundException e) { JOptionPane.showMessageDialog(this, "指定的文件名称或属性有问题！"); flag = 0; } catch (IOException e) { JOptionPane.showMessageDialog(this, "无法写文件，请检查文件是否被锁定"); flag = 0; } } if (flag == 1) {//文件保存成功，修改相关变量 changed = false; haveName = true; file = tmpfile; this.setTitle(file.getName() + " - 记事本"); } return flag; } //新建一个文件 void doNewFile() { int select, flag; if (changed) { select = JOptionPane.showConfirmDialog(this, "文件修改后尚未存盘，要保存吗？"); switch (select) { case JOptionPane.YES_OPTION: flag = doSave(); break; case JOptionPane.NO_OPTION: flag = 1; break; default: flag = 0; break; } } else { flag = 1; } if (flag == 1) { changed = false; haveName = false; setTitle("记事本 -- 未命名"); text.setText(null);