java记事本（含源代码）

package notebook; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JOptionPane; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JToolBar; /* *@author:赵继辉 Date:2008-11-5 *TEL:13502131018 *Mail:[email protected] * */ import javax.swing.JMenuItem; public class NoteBook { public static void main(String[] args) { JFrame noteBookJFrame = new JFrame("My Note Book"); noteBookJFrame.setLocation(250, 150); noteBookJFrame.setSize(550, 500); noteBookJFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container noteBookContainer = noteBookJFrame.getContentPane(); noteBookContainer.setLayout(new BorderLayout()); //编辑区域 JTextArea noteBookTextArea = new JTextArea(); noteBookTextArea.setBackground(new Color(207, 233, 207)); noteBookTextArea.setFont(new Font("宋体", Font.PLAIN, 16)); noteBookContainer.add(noteBookTextArea); JScrollPane textAreaScroll = new JScrollPane(noteBookTextArea); noteBookContainer.add(textAreaScroll); //工具栏 JToolBar noteBookJToolBar = new JToolBar(); JButton b_New = new JButton(new ImageIcon("New.png")); JButton b_Open = new JButton(new ImageIcon("Open.png")); JButton b_Save = new JButton(new ImageIcon("Save.png")); b_New.setToolTipText("Greate a new file"); b_Save.setToolTipText("Save the file"); b_Open.setToolTipText("Open a file"); b_New.setActionCommand("New"); b_Open.setActionCommand("Open"); b_Save.setActionCommand("Save"); noteBookContainer.add(noteBookJToolBar, "North"); noteBookJToolBar.add(b_New); noteBookJToolBar.add(b_Open); noteBookJToolBar.add(b_Save); JMenuBar noteBookJMenuBar = new JMenuBar(); //文件菜单 JMenu file = new JMenu("File"); noteBookJMenuBar.add(file); JMenuItem file_new = new JMenuItem("New"); file_new.setMnemonic('N'); file.add(file_new); JMenuItem file_open = new JMenuItem("Open"); file_open.setMnemonic('O'); file.add(file_open); JMenuItem file_save = new JMenuItem("Save"); file_save.setMnemonic('S'); file.add(file_save); file.setMnemonic('F'); //帮助菜单 JMenu help = new JMenu("Help"); noteBookJMenuBar.add(help); JMenuItem help_about = new JMenuItem("About"); help_about.setMnemonic('A'); help.add(help_about); help.setMnemonic('H'); MenuMonitor monitor = new MenuMonitor(noteBookTextArea); file_new.addActionListener(monitor); file_open.addActionListener(monitor); file_save.addActionListener(monitor); help_about.addActionListener(monitor); b_New.addActionListener(monitor); b_Open.addActionListener(monitor); b_Save.addActionListener(monitor); noteBookJFrame.setJMenuBar(noteBookJMenuBar); noteBookJFrame.setVisible(true); } } class MenuMonitor implements ActionListener { private JTextArea jta; public MenuMonitor(JTextArea jta) { this.jta = jta; } public void actionPerformed(ActionEvent e) { String s = e.getActionCommand(); if (s.equals("About")) { JOptionPane.showConfirmDialog(null, "Version 1.0\nAuthor:赵继辉", "About", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE); } if (s.equals("New")) { if (!jta.getText().equals("") ){ int result = JOptionPane.showConfirmDialog(null, "不保存正在编辑的文件吗？", "警告", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE); if (result == JOptionPane.YES_OPTION) { jta.setText(""); } if (result == JOptionPane.NO_OPTION) { JFileChooser jfc = new JFileChooser(); jfc.showSaveDialog(null); File file = jfc.getSelectedFile(); try { PrintWriter br = new PrintWriter(new FileWriter(file)); String content = jta.getText(); String[] line = content.split("\n"); for (int i = 0; i < line.length; i++) { br.println(line[i]); } br.flush(); br.close(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } } } if (s.equals("Open")) { jta.setText(""); JFileChooser jfc = new JFileChooser(); jfc.showOpenDialog(null); File file = jfc.getSelectedFile(); if (file != null) { try { BufferedReader br = new BufferedReader(new FileReader(file)); String line = br.readLine(); while (line != null) { jta.append(line + "\n"); line = br.readLine(); } br.close(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } } if (s.equals("Save")) { JFileChooser jfc = new JFileChooser(); jfc.showSaveDialog(null); File file = jfc.getSelectedFile(); if(file!=null) try { PrintWriter br = new PrintWriter(new FileWriter(file)); String content = jta.getText(); String[] line = content.split("\n"); for (int i = 0; i < line.length; i++) { br.println(line[i]); } br.flush(); br.close(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } } }