Does the thumbnailator support generating thumbnails for png images?

[lhfwudi]

Why do png thumbnails report exceptions?

1. My code is as follows
   public static void main(String[] args) throws Exception {
   String srcFile = "C:\Users\admin\Desktop\2222.png";
   String desFile = "C:\data1\share\biztable\mini\task_fill\333.png";
   BufferedImage originalImage = ImageIO.read(new File(srcFile));
   BufferedImage thumbnail = Thumbnails.of(originalImage)
   .size(200, 200)
   .keepAspectRatio(false)
   .asBufferedImage();
   Thumbnails.of(thumbnail)
   .scale(0.3)
   .outputQuality(0.25f)
   .toFile(desFile);
   }
2. The abnormal information is as follows
   Exception in thread "main" javax.imageio.IIOException: Unsupported Image Type
   at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1079)
   at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1050)
   at javax.imageio.ImageIO.read(ImageIO.java:1448)
   at javax.imageio.ImageIO.read(ImageIO.java:1308)
   at zsoft.gov.datacenter.biztable.common.utils.UploadUtil.main(UploadUtil.java:266)

May I ask what causes it? Or is the thumbnailator not supported?

[coobird]

@lhfwudi, the stacktrace shows that Thumbnailator is not being called. The exception is happening on this line:

BufferedImage originalImage = ImageIO.read(new File(srcFile));

And inspecting closer, Java thinks it's a JPEG file even though it has a PNG extension. Therefore, it seems like your image file is mislabeled with a wrong extension. This is not an issue with Thumbnailator as it's not being invoked.