JFileChooser select directory but show files

问题

I feel like there should be a simple way to do this but I can't figure it out. I have a JFileChooser that allows the user to select directories. I want to show all the files in the directories to give the user some context, but only directories should be accepted as selections (maybe the Open button would be disabled when a file is selected). Is there an easy way of doing this?

回答1:

Override the approveSelection() method. Something like:

JFileChooser chooser = new JFileChooser( new File(".") )
{
    public void approveSelection()
    {
        if (getSelectedFile().isFile())
        {
            // beep
            return;
        }
        else
            super.approveSelection();
    }
};

回答2:

My solution is a merge between the answers of camickr and trashgod:

    final JFileChooser chooser = new JFileChooser() {
            public void approveSelection() {
                if (getSelectedFile().isFile()) {
                    return;
                } else
                    super.approveSelection();
            }
    };
    chooser.setFileSelectionMode( JFileChooser.FILES_AND_DIRECTORIES );

回答3:

See setFileSelectionMode() in How to Use File Choosers:

setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY)

Addendum: The effect can be see by uncommenting line 73 of this FileChooserDemo, but it appears to be platform-dependent.

Addendum: If using FILES_AND_DIRECTORIES, consider changing the button text accordingly:

chooser.setApproveButtonText("Choose directory");

As the effect is L&F dependent, consider using DIRECTORIES_ONLY on platforms that already meet your UI requirements:

if (System.getProperty("os.name").startsWith("Mac OS X")) {
    chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
} else {
    chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
}

回答4:

The solution of overriding approveSelection can be annoying for certain users.

Sometimes, a user would just click on a file in a directory for no reason (even though she wants to select the directory and not the file). If that happens, the user would be (kind-a) stuck in the JFileChooser as the approveSelection will fail, even if she deselects the file. To avoid this annoyance, this is what I do:

JFileChooser fileChooser = new JFileChooser();

fileChooser.setFileSelectionMode(
        JFileChooser.FILES_AND_DIRECTORIES);

int option = fileChooser.showDialog(null,
        "Select Directory");

if (option == JFileChooser.APPROVE_OPTION) {
    File f = fileChooser.getSelectedFile();
    // if the user accidently click a file, then select the parent directory.
    if (!f.isDirectory()) {
        f = f.getParentFile();
    }
    System.out.println("Selected directory for import " + f);
}

Selecting the directory, even when the user selected a file results in a better usability in my opinion.

回答5:

AFAIK JFileChooser separates file filtering (what can be viewed, very configurable) from selection filtering (what can be chosen).

The configuration of selection filtering is much more limited, but AFAIK you can choose to allow only dirs or only files to be selected with setFileSelectionMode()

回答6:

Keep the fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY) and use:

File[] selectedFiles = fileChooser.getSelectedFile().listFiles();

回答7:

I think the best solution is just to allow the user to select either a file or a directory. And if the user select a file just use the directory where that file is located.

来源：https://stackoverflow.com/questions/2883447/jfilechooser-select-directory-but-show-files

标签

java

swing

jfilechooser