Java / ImageIO获取图像尺寸而不读取整个文件？

问题描述

有没有办法在不读取整个文件的情况下获取图片的尺寸？

Is there a way to get the dimensions of an image without reading the entire file?

URL url=new URL(<BIG_IMAGE_URL>);
BufferedImage img=ImageIO.read(url);
System.out.println(img.getWidth()+" "+img.getHeight());
img=null;

推荐答案

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();
        }
    }
}

感谢sfussenegger的建议

Thanks to sfussenegger for the suggestion

这篇关于Java / ImageIO获取图像尺寸而不读取整个文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！