这本书挺不错的,台湾人写的书品质就是好。
只是宣传得有点夸张,比如他的另外一本书 《Servlet jsp 学习笔记》,
在 《java 7 学习笔记》中说书中有一个微博的例子,其实只是一个书签的例子。
好书是经得起考验的,不需要出版社过度的夸张宣传。
JNotePad.java
package com.xjh.swing; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.InputEvent; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.lang.reflect.InvocationTargetException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import javax.swing.BorderFactory; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JPopupMenu; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.KeyStroke; import javax.swing.ScrollPaneConstants; import javax.swing.SwingConstants; public class JNotePad extends JFrame { private JMenuBar menuBar; private JMenu fileMenu; private JMenuItem menuOpen; private JMenuItem menuSave; private JMenuItem menuSaveAs; private JMenuItem menuClose; private JMenu editMenu; private JMenuItem menuCut; private JMenuItem menuCopy; private JMenuItem menuPaste; private JMenu aboutMenu; private JMenuItem menuAbout; private JTextArea textArea; private JLabel stateBar; private JPopupMenu popUpMenu; private TextDAO textDAO; private JFileChooser fileChooser; public JNotePad(TextDAO textDAO) { this(); this.textDAO = textDAO; } public JNotePad() { initCompanents(); initEventListeners(); } private void initCompanents() { setTitle("新增纯文本文件"); setSize(400, 300); // 设置"文件"菜单 fileMenu = new JMenu("文件"); menuOpen = new JMenuItem("打开文件"); menuSave = new JMenuItem("保存文件"); menuSaveAs = new JMenuItem("另存新文件"); menuClose = new JMenuItem("关闭"); fileMenu.add(menuOpen); fileMenu.addSeparator(); // 分隔线 fileMenu.add(menuSave); fileMenu.add(menuSaveAs); fileMenu.addSeparator(); // 分隔线 fileMenu.add(menuClose); // 设置"编辑"菜单 editMenu = new JMenu("编辑"); menuCut = new JMenuItem("剪贴"); menuCopy = new JMenuItem("拷贝"); menuPaste = new JMenuItem("粘贴"); editMenu.add(menuCut); editMenu.add(menuCopy); editMenu.add(menuPaste); // 设置"关于"菜单 aboutMenu = new JMenu("关于"); menuAbout = new JMenuItem("关于JNotePad"); aboutMenu.add(menuAbout); // 菜单列 menuBar = new JMenuBar(); menuBar.add(fileMenu); // 文件 menuBar.add(editMenu); // 编辑 menuBar.add(aboutMenu); // 关于 // 设置菜单列 setJMenuBar(menuBar); // 文字编辑区 textArea = new JTextArea(); textArea.setFont(new Font("宋体", Font.PLAIN, 16)); textArea.setLineWrap(true); // 设置自动换行 // 水平滚动条(不显示)和垂直滚动条(当有需要的时候显示) JScrollPane pane = new JScrollPane(textArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); Container contentPane = this.getContentPane(); contentPane.add(pane, BorderLayout.CENTER); // 状态栏 stateBar = new JLabel("未修改"); stateBar.setHorizontalAlignment(SwingConstants.LEFT); // 文字左对齐 stateBar.setBorder(BorderFactory.createEtchedBorder()); contentPane.add(stateBar, BorderLayout.SOUTH); // 布局管理器 popUpMenu = editMenu.getPopupMenu(); fileChooser = new JFileChooser(); } private void initEventListeners() { // 点击窗口开关按钮事件处理 addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { closeFile(); } }); // 菜单-打开文件 menuOpen.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { openFile(); } }); // 菜单-保存文件 menuSave.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveFile(); } }); // 菜单-另存新文件 menuSaveAs.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveFileAs(); } }); // 菜单-关闭文件 menuClose.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { closeFile(); } }); // 菜单-剪切 menuCut.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cut(); } }); // 菜单-复制 menuCopy.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { copy(); } }); // 菜单-粘贴 menuPaste.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { paste(); } }); // 菜单-关于 menuAbout.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 显示对话框 JOptionPane.showOptionDialog(null, "JNotePad 0.1", "关于JNotePad", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null); } }); // 编辑区键盘事件 textArea.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { jtextAreaActionPerformed(); } }); // 编辑区鼠标事件 textArea.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { popUpMenu.show(editMenu, e.getX(), e.getY()); } } public void mouseClicked(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON1) { popUpMenu.setVisible(false); } } }); // this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 快捷键设置 menuOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK)); menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK)); menuClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, InputEvent.CTRL_MASK)); menuCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK)); menuCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK)); menuPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK)); } private void openFile() { if (stateBar.getText().equals("未修改")) { // 文件是否为存储状态 showFileDialog(); // 打开文件 } else { int option = JOptionPane.showConfirmDialog(null, "文件已修改,是否保存?", "保存文件?", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE, null); switch (option) { case JOptionPane.YES_OPTION: // 确认文件保存 saveFile(); // 保存文件 break; case JOptionPane.NO_OPTION: // 放弃文件保存 showFileDialog(); break; } } } private void showFileDialog() { int option = fileChooser.showDialog(null, null); // 文件选取对话框 // 使用者单击确认键 if (option == JFileChooser.APPROVE_OPTION) { try { setTitle(fileChooser.getSelectedFile().toString()); textArea.setText(""); stateBar.setText("未修改"); String text = textDAO.read(fileChooser.getSelectedFile().toString()); textArea.setText(text); } catch (Throwable e) { JOptionPane.showMessageDialog(null, e.toString(), "打开文件失败", JOptionPane.ERROR_MESSAGE); } } } private void saveFile() { // 从标题栏获取文件名 Path path = Paths.get(getTitle()); if (Files.notExists(path)) { saveFileAs(); } else { try { textDAO.save(path.toString(), textArea.getText()); stateBar.setText("未修改"); } catch (Throwable e) { JOptionPane.showMessageDialog(null, e.toString(), "写入文件失败", JOptionPane.ERROR_MESSAGE); } } } private void saveFileAs() { int option = fileChooser.showDialog(null, null); if (option == JFileChooser.APPROVE_OPTION) { setTitle(fileChooser.getSelectedFile().toString()); textDAO.create(fileChooser.getSelectedFile().toString()); saveFile(); } } private void closeFile() { if (stateBar.getText().equals("未修改")) { dispose(); } else { int option = JOptionPane.showConfirmDialog(null, "文件已经修改, 是否保存?", "保存文件?", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE, null); switch (option) { case JOptionPane.YES_OPTION: saveFile(); break; case JOptionPane.NO_OPTION: dispose(); } } } private void cut() { textArea.cut(); stateBar.setText("已修改"); popUpMenu.setVisible(false); } private void copy() { textArea.copy(); popUpMenu.setVisible(false); } private void paste() { textArea.paste(); stateBar.setText("已修改"); popUpMenu.setVisible(false); } private void jtextAreaActionPerformed() {} public static void main(String[] args) throws InvocationTargetException, InterruptedException { javax.swing.SwingUtilities.invokeAndWait(new Runnable() { @Override public void run() { new JNotePad().setVisible(true); } }); } }
TextDAO.java
package com.xjh.swing; public interface TextDAO { void create(String file); String read(String toString); void save(String file, String text); }
FileTextDAO.java
package com.xjh.swing; import java.io.BufferedWriter; import java.io.IOException; import java.nio.charset.Charset; import java.nio.file.Files; import java.nio.file.Paths; import java.util.logging.Level; import java.util.logging.Logger; public class FileTextDAO implements TextDAO { @Override public String read(String file) { byte[] datas = null; try { datas = Files.readAllBytes(Paths.get(file)); } catch (IOException ex) { Logger.getLogger(FileTextDAO.class.getName()).log(Level.SEVERE, null, ex); } return new String(datas); } @Override public void save(String file, String text) { try (BufferedWriter writer = Files.newBufferedWriter(Paths.get(file), Charset.forName(System.getProperty("file.endoding")))) { writer.write(text); } catch (IOException ex) { Logger.getLogger(FileTextDAO.class.getName()).log(Level.SEVERE, null, ex); } } @Override public void create(String file) { try { Files.createFile(Paths.get(file)); } catch (IOException ex) { Logger.getLogger(FileTextDAO.class.getName()).log(Level.SEVERE, null, ex); } } }