ImageInputStream iis = ImageIO.createImageInputStream(new File(
                "E:/1.jpg"));
        Iterator iter = ImageIO.getImageReaders(iis);
        if (!iter.hasNext()) {
            System.out.println("null");
        }else{
            ImageReader reader = (ImageReader) iter.next();
            System.out.println(reader.getFormatName());
        }

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