jishiben.rar_简单的笔记本

import java.awt.*; import java.awt.event.*; import java.io.*; import javax.swing.*; public class TextEditorFrame extends JFrame { File file = null; TextEditorFrame() { initTextPane(); initAboutDialog(); initToolBar(); initMenu(); } void initTextPane() { getContentPane().add(new JScrollPane(text)); } JTextPane text = new JTextPane(); JFileChooser filechooser = new JFileChooser(); JDialog about = new JDialog(this); JMenuBar menubar = new JMenuBar(); JMenu[] menus = new JMenu[] { new JMenu("File"), new JMenu("Edit"), new JMenu("Help") }; JMenuItem menuitems[][] = new JMenuItem[][] { { new JMenuItem("New"), new JMenuItem("Open"), new JMenuItem("Save"), new JMenuItem("Exit") }, {new JMenuItem("Copy"), new JMenuItem("Cut"), new JMenuItem("Paste") }, {new JMenuItem("Help") } }; void initMenu() { for (int i = 0; i < menus.length; i++) { menubar.add(menus[i]); for (int j = 0; j < menuitems[i].length; j++) { menus[i].add(menuitems[i][j]); menuitems[i][j].addActionListener(action); } } this.setJMenuBar(menubar); } ActionListener action = new ActionListener() { public void actionPerformed(ActionEvent e) { JMenuItem mi = (JMenuItem) e.getSource(); String id = mi.getText(); if (id.equals("New")) { text.setText(""); file = null; } else if (id.equals("Open")) { if (file != null) filechooser.setSelectedFile(file); int returnVal = filechooser .showOpenDialog(TextEditorFrame.this); if (returnVal == JFileChooser.APPROVE_OPTION) { file = filechooser.getSelectedFile(); openFile(); } } else if (id.equals("Save")) { if (file != null) filechooser.setSelectedFile(file); int returnVal = filechooser .showSaveDialog(TextEditorFrame.this); if (returnVal == JFileChooser.APPROVE_OPTION) { file = filechooser.getSelectedFile(); saveFile(); } } else if (id.equals("Exit")) { TextEditorFrame f = new TextEditorFrame(); int s = JOptionPane.showConfirmDialog(f, "Really want to exit?", "Exit", JOptionPane.YES_NO_CANCEL_OPTION); if (s == JOptionPane.YES_OPTION) System.exit(0); } else if (id.equals("Cut")) { text.cut(); } else if (id.equals("Copy")) { text.copy(); } else if (id.equals("Paste")) { text.paste(); } else if (id.equals("Help")) { about.setSize(200,150); about.setTitle("Help"); about.show(); } } }; void saveFile() { try { FileWriter fw = new FileWriter(file); fw.write(text.getText()); fw.close(); } catch (Exception e) { e.printStackTrace(); } } void openFile() { try { FileReader fr = new FileReader(file); int len = (int) file.length(); char[] buffer = new char[len]; fr.read(buffer, 0, len); fr.close(); text.setText(new String(buffer)); } catch (Exception e) { e.printStackTrace(); } } void initAboutDialog() { about.getContentPane().add(new JLabel("This is a TextEditor programme")); about.setModal(true); } JToolBar toolbar = new JToolBar(); JButton[] buttons = new JButton[] { new JButton("", new ImageIcon("fuzhi.jpg")), new JButton("", new ImageIcon("jianqie.jpg")), new JButton("", new ImageIcon("zhantie.jpg")) }; void initToolBar() { for (int i = 0; i < buttons.length; i++) toolbar.add(buttons[i]); buttons[0].setToolTipText("Copy"); buttons[0].addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { text.copy(); } }); buttons[1].setToolTipText("Cut"); buttons[1].addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { text.cut(); } }); buttons[2].setToolTipText("Paste"); buttons[2].addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { text.paste(); } }); this.getContentPane().add(toolbar, BorderLayout.NORTH); } public static void main(String args[]) { TextEditorFrame f = new TextEditorFrame(); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { TextEditorFrame f = new TextEditorFrame(); int s = JOptionPane.showConfirmDialog(f, "Really want to exit?", "Exit", JOptionPane.YES_NO_OPTION); if (s == JOptionPane.YES_OPTION) System.exit(0); } }); f.setTitle("TextEditor"); f.setSize(750, 550); f.setVisible(true); } }