java
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private boolean checkFile(MultipartFile file) throws IOException {
String imageType = getImageType(ImageIO.createImageInputStream(file.getInputStream()));
return !StringUtils.isEmpty(imageType);
}
java
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/**
* 获取图片类型，图片类型返回图片格式，例如JPEG
* 非图片类型返回null
*
* @param inputStream
* @return
* @throws IOException
*/
private static String getImageType(ImageInputStream inputStream) throws IOException {
final Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(inputStream);
if (imageReaders.hasNext()) {
final ImageReader imageReader = imageReaders.next();
return imageReader.getFormatName();
}
return null;
}