how to refresh content of JTree in java?

Question

I have a JTree which shows content of specific directory. When a download some file with ftp to this directory i want to let my JTree know about it and refresh his contents. How can i refresh JTree after some file added or removed from directory which is root for JTree?

btnRefreshContents.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            tree.getModel().
        }
    });

score 3 · Answer 1 · edited May 23 '17 at 12:11

3

If you're using Java 7, you can use the new WatchService (FileSystem.newWatchService()) to detect changes to the filesystem. Here's an article on it.

As to updating the JTree component, take a look at this Stack Overflow page.

edited May 23 '17 at 12:11

Community

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answered Apr 30 '12 at 11:15

Greg Kopff

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You are right, but i have no other chooses.I have to use Java 1.5. Is it good idea to reload a JTree with the same directory again after adding files to it? – itro Apr 30 '12 at 11:28

score 0 · Answer 2 · edited May 23 '17 at 12:11

You could add directory listener to the underlying tree model. There are many solutions for that. As already stated above, WatchService in Java 7 can be useful. But since you are not yet at Java 7 you can try other approaches:

JNotify - java library that allows java application to listen to file system events. Here is a sample (make sure you add dll/so dependency to your path.)

VFS from Apache Commons. Commons VFS provides a single API for accessing various different file systems. DefaultFileMonitor is a good example.

how to refresh content of JTree in java?

2 Answers2