java JFileChooser File Size Filter

问题

I know I can make a filter by file type, but is it possible to filter by file size?

For example a JFileChooser to show only pictures within 3 MegaBytes.

回答1:

The short answer should be, what have you tried? The long answer is yes...

JFileChooser fc = new JFileChooser();
fc.addChoosableFileFilter(new FileFilter() {

    @Override
    public boolean accept(File f) {
        String name = f.getName().toLowerCase();
        return (name.endsWith(".png") &&
                        name.endsWith(".jpg") &&
                        name.endsWith(".gif") &&
                        name.endsWith(".bmp") &&
                        f.length() < 3 * (1024 * 1024));
    }

    @Override
    public String getDescription() {
        return "Images < 3mb";
    }
});

Technically, you can filter on any property or combination of properties from File

回答2:

Create a sub-class of FileFilter. In the accept method, decide if the file is too large or not.

public boolean accept(File f) {
    if(f.length() > maxSize) return false;
    return true;
}

Then apply the filter to your File Chooser

来源：https://stackoverflow.com/questions/28667457/java-jfilechooser-file-size-filter