Java / ImageIO获取图像尺寸而不读取整个文件？

try(ImageInputStream in = ImageIO.createImageInputStream(resourceFile)){    final Iterator<ImageReader> readers = ImageIO.getImageReaders(in);    if (readers.hasNext()) {        ImageReader reader = readers.next();        try { reader.setInput(in); return new Dimension(reader.getWidth(0), reader.getHeight(0));        } finally { reader.dispose();        }    }}