java写的记事本软件 NotePad

package com.sqxin; import java.awt.Dimension; import java.awt.FileDialog; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; 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; public class NotePad extends JFrame implements WindowListener { private JScrollPane jsp; private JTextArea txtArea; private JMenuBar jm; private JMenu file, edit, format, help; private JMenuItem file_new, file_open, file_save, exit; private JMenuItem edit_cut, edit_copy, edit_paste, edit_find, edit_selectAll; private JCheckBoxMenuItem format_wrap; private JMenuItem help_issue; private JPopupMenu jpm; private JMenuItem jp_cut, jp_copy, jp_paste, jp_selectAll; private FileDialog openFileDialog, saveFileDialog; private NotePadSize size; private Dimension notePadDimension; public NotePad() throws IOException { super("记事本"); jm = new JMenuBar(); file = new JMenu("文件(F)"); edit = new JMenu("编辑(E)"); format = new JMenu("格式(O)"); help = new JMenu("帮助(H)"); // 文件菜单实例化 file_new = new JMenuItem("新建(N)"); file_open = new JMenuItem("打开(O)"); file_save = new JMenuItem("保存(S)"); exit = new JMenuItem("退出(X)"); file.add(file_new); file.add(file_open); file.add(file_save); file.addSeparator(); file.add(exit); // 编辑菜单实例化 edit_cut = new JMenuItem("剪切"); edit_copy = new JMenuItem("复制"); edit_paste = new JMenuItem("粘贴"); edit_find = new JMenuItem("查找"); edit_selectAll = new JMenuItem("全选"); edit.add(edit_cut); edit.add(edit_copy); edit.add(edit_paste); edit.add(edit_find); edit.add(edit_selectAll); // 格式菜单的实例化 format_wrap = new JCheckBoxMenuItem("自动换行"); format.add(format_wrap); // 帮助菜单的实例化 help_issue = new JMenuItem("关于记事本"); help.add(help_issue); // 添加右键弹出式菜单 jpm = new JPopupMenu(); jp_cut = new JMenuItem("剪切"); jp_copy = new JMenuItem("复制"); jp_paste = new JMenuItem("粘贴"); jp_selectAll = new JMenuItem("全选"); jpm.add(jp_cut); jpm.add(jp_copy); jpm.add(jp_paste); jpm.addSeparator(); jpm.add(jp_selectAll); // 注册监听组件 file_new.addActionListener(new NotePadActionListener()); file_save.addActionListener(new NotePadActionListener()); file_open.addActionListener(new NotePadActionListener()); exit.addActionListener(new NotePadActionListener()); edit_copy.addActionListener(new NotePadActionListener()); edit_cut.addActionListener(new NotePadActionListener()); edit_find.addActionListener(new NotePadActionListener()); edit_paste.addActionListener(new NotePadActionListener()); edit_selectAll.addActionListener(new NotePadActionListener()); format_wrap.addActionListener(new NotePadActionListener()); help_issue.addActionListener(new NotePadActionListener()); jp_copy.addActionListener(new NotePadActionListener()); jp_cut.addActionListener(new NotePadActionListener()); jp_paste.addActionListener(new NotePadActionListener()); jp_selectAll.addActionListener(new NotePadActionListener()); // 实例化对话框 openFileDialog = new FileDialog(this, "打开文件", FileDialog.LOAD); saveFileDialog = new FileDialog(this, "保存文件", FileDialog.SAVE); jm.add(file); jm.add(edit); jm.add(format); jm.add(help); this.setJMenuBar(jm); txtArea = new JTextArea(); txtArea.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { jpm.show(e.getComponent(), e.getX(), e.getY()); } } }); jsp = new JScrollPane(txtArea); this.add(jsp); size = new NotePadSize(); this.addWindowListener(this); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); notePadDimension = new Dimension(size.getSize()); this.setSize(notePadDimension); // 让窗体居中显示 setLocation(getToolkit().getScreenSize().width / 2 - notePadDimension.width / 2, getToolkit().getScreenSize().height / 2 - notePadDimension.height / 2); setVisible(true); } public static void main(String[] args) throws IOException { new NotePad(); } /* 内部来用于处理事件 */ class NotePadActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { Object o = e.getSource(); if (o == file_new) { txtArea.setText(""); } else if (o == file_open) { openFileDialog.setVisible(true); String name = openFileDialog.getDirectory() + openFileDialog.getFile(); openFile(name); } else if (o == file_save) { saveFileDialog.setVisible(true); String name = saveFileDialog.getDirectory() + saveFileDialog.getFile(); saveFile(name); } else if (o == exit) { notePadDimension = getSize(); try { size.setSize(notePadDimension); } catch (IOException e1) { e1.printStackTrace(); } System.exit(0); } else if (o == help_issue) { JOptionPane.showMessageDialog(txtArea, "关于记事本:" + "\n仅供学习参考NotePad Beta1.0"); } else if (o == edit_copy || o == jp_copy) { txtArea.copy(); } else if (o == edit_cut || o == jp_cut) { txtArea.cut(); } else if (o == edit_paste || o == jp_paste) { txtArea.paste(); } else if (o == edit_selectAll || o == jp_selectAll) { txtArea.selectAll(); } else if (o == edit_find) { String findStr = JOptionPane.showInputDialog(txtArea,"输入查找的内容","输入",JOptionPane.QUESTION_MESSAGE); find(findStr); } else if (o == format_wrap) { //自动换行 if(format_wrap.isSelected()) { txtArea.setLineWrap(true); }else { txtArea.setLineWrap(false); } } } // 打开文件 public void openFile(String fileName) { File file = new File(fileName); try { FileReader reader = new FileReader(file); BufferedReader br = new BufferedReader(reader); String s = new String(); while ((s = br.readLine()) != null) { txtArea.append(s + "\n"); } br.close(); reader.close(); } catch (Exception e) { e.printStackTrace(); } } // 保存文件 public void saveFile(String fileName) { File file = new File(fileName); try { FileWriter save = new FileWriter(file); save.write(txtArea.getText()); save.close(); } catch (IOException e) { e.printStackTrace(); } } // 查找文件 public void find(String findStr) { int x; x = txtArea.getText().indexOf(findStr); if (x != -1) { txtArea.select(x, x + findStr.length()); } else { JOptionPane.showMessageDialog(txtArea, "查找失败", "没有找到", JOptionPane.WARNING_MESSAGE); } } } public void windowClosed(WindowEvent e) { //System.out.println("-----------"); } @Override public void windowActivated(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowClosing(WindowEvent e) { System.out.println("-------------"); notePadDimension = this.getSize(); try { size.setSize(notePadDimension); } catch (IOException e1) { e1.printStackTrace(); } } @Override public void windowDeactivated(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeiconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowIconified(WindowEvent e) { /