Question

我学习了如何使用filefilter来使用过滤器。

FileFilter filter = new FileNameExtensionFilter("JPEG file", "jpg", "jpeg");

但是我想用包含某些字符串的文件来过滤我的filechooser，比如有＆＃34; sample＆＃34;在他们的文件名中。

只能选择具有这些字符串的文件，并且此过滤器不能编辑。我该怎么办？

Answer 1

public class ImageFilter extends FileFilter {

    //Accept all directories and all jpeg, jpg files with lossy in its filename.
    public boolean accept(File f) {
        if (f.isDirectory()) {
            return true;
        }

        String extension = Utils.getExtension(f);
        String filename = Utils.getName(f);
        if (extension != null) {
            if ((extension.equals(Utils.jpeg) || extension.equals(Utils.jpg)) && filename.contains("lossy")) {
                    return true;
            } else {
                return false;
            }
        }

        return false;
    }

    //The description of this filter
    public String getDescription() {
        return "Images (Lossy)";
    }
}

这是我的utils类

public class Utils {
    public final static String jpeg = "jpeg";
    public final static String jpg = "jpg";

/*
 * Get the extension of a file.
 */
    public static String getExtension(File f) {
        String ext = null;
        String s = f.getName();
        int i = s.lastIndexOf('.');

        if (i > 0 &&  i < s.length() - 1) {
            ext = s.substring(i+1).toLowerCase();
        }
        return ext;
    }
    public static String getName(File f) {
        String fname = null;
        String s = f.getName();
        int i = s.length() - s.lastIndexOf('.');
        fname = s.substring(0,s.length()-i);

        return fname;
    }

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = Utils.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }
}

申请，

fc.addChoosableFileFilter(new ImageFilter());

通过filename过滤filechooser

1 个答案: