java实现文件监控_JAVA_编程开发_程序员俱乐部

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 " );
????????}
????}
}