java开源组件jNotify实现文件监控

[url]http://hi.baidu.com/wzwahl36/item/591030c630da7a66f7c95d98[/url]
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");

}

}

}