Java tips: Java implementation file monitoring skills sharing

Java itself does not directly listen to the system's file operation events, but you can first write the C + + call operating system API listening file, and then through the method of JNI call implementation. Limited to my C + + level, the interface is not implemented in C/C + +, and there are open source components jnotify implemented This feature, this example uses 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 (monitoring path:);

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 (start monitoring);

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;

Add File Listener

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 (file: + RootPath +: + oldname + renamed to:

+ NewName + \ n);

}

public void filemodified (int wd, string RootPath, string name) ... {

Textarea.append (file modification + RootPath +: + name + \ n);

}

public void filedeleted (int wd, string RootPath, string name) ... {

Textarea.append (delete file: + RootPath +: + name + \ n);

}

public void filecreated (int wd, string RootPath, string name) ... {

Textarea.append (New file: + RootPath +: + name + \ n);

}

}

}

Run Effect: Create a new file and modify the filename action on the D drive.

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Java tips: Java implementation file monitoring skills sharing