java实现文件监控
转自http://www.blogjava.net/pengo/archive/2011/01/09/342622.html
java本身不能直接监听系统的文件操作事件，不过可以先编写C/C++调用操作系统的API监听文件，再通过jni调用的方式实现。限于本人的C/C++水平有限，没有用C/C++实现该接口，而且已有开源组件JNotify实现了这个功能，本文例子使用JNotify。
public class MainFrame extends JFrame { private JPanel contentPane; private JTextField textField; private JTextArea textArea; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MainFrame frame = new MainFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public MainFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 543, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JLabel label = new JLabel("监控路径："); label.setBounds(33, 20, 65, 15); contentPane.add(label); textField = new JTextField("D:/"); textField.setBounds(90, 16, 219, 21); contentPane.add(textField); textField.setColumns(10); JButton button = new JButton("开始监控"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { addWatch(); } catch (Exception ex) { ex.printStackTrace(); } } }); button.setBounds(319, 16, 93, 23); contentPane.add(button); textArea = new JTextArea(); JScrollPane scrollPane = new JScrollPane(textArea); scrollPane.setBounds(33, 45, 480, 207); contentPane.add(scrollPane); } public void addWatch() throws Exception { String path = textField.getText(); int mask = JNotify.FILE_CREATED | JNotify.FILE_DELETED | JNotify.FILE_MODIFIED | JNotify.FILE_RENAMED; boolean watchSubtree = true; //添加文件监听 int watchID = JNotify.addWatch(path, mask, watchSubtree, new Listener()); } class Listener implements JNotifyListener { public void fileRenamed(int wd, String rootPath, String oldName, String newName) { textArea.append("文件：" + rootPath + " : " + oldName + " 重命名为： " + newName + "\n"); } public void fileModified(int wd, String rootPath, String name) { textArea.append("文件修改 " + rootPath + " : " + name + "\n"); } public void fileDeleted(int wd, String rootPath, String name) { textArea.append("删除文件： " + rootPath + " : " + name + "\n"); } public void fileCreated(int wd, String rootPath, String name) { textArea.append("新建文件: " + rootPath + " : " + name + "\n"); } }}