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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);
}
}
}
运行效果：在D盘新建一个文件和修改文件名操作。
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原文地址：http://www.cnblogs.com/SA-Jim/p/5403797.html
