如何在Java中检测损坏的图像(PNG，JPG) [英] How to detect corrupted images (PNG, JPG) in Java

问题描述

我需要检测Java中图像文件是否损坏.我仅处理PNG，JPG图像.这可能与Sanselan有关吗?还是可以用ImageIO完成?我已经尝试过使用ImageIO.read看起来像它的作品.但是我不确定它是否可以检测图像中的各种错误.我想知道什么是最佳做法.

I need to detect if the image file is corrupted in Java. I'm working only with PNG, JPG images. Is this possible to do with Sanselan? Or can it be done with ImageIO? I've tried using ImageIO.read seems like it works. But I'm not sure if it can detect every kind of errors in images. I'd like to know what's the best practice.

推荐答案

这是我的解决方案，用于检查损坏的GIF，JPG和PNG.它使用JPEG EOF标记检查截断的JPEG，使用越界索引检查GIF并使用EOFException检查PNG

Here is my solution that would handle checking for broken GIF, JPG and PNG. It checks for truncated JPEG using the JPEG EOF marker, GIF using an index out of bounds exception check and PNG using an EOFException

public static ImageAnalysisResult analyzeImage(final Path file)
        throws NoSuchAlgorithmException, IOException {
    final ImageAnalysisResult result = new ImageAnalysisResult();

    final InputStream digestInputStream = Files.newInputStream(file);
    try {
        final ImageInputStream imageInputStream = ImageIO
                .createImageInputStream(digestInputStream);
        final Iterator<ImageReader> imageReaders = ImageIO
                .getImageReaders(imageInputStream);
        if (!imageReaders.hasNext()) {
            result.setImage(false);
            return result;
        }
        final ImageReader imageReader = imageReaders.next();
        imageReader.setInput(imageInputStream);
        final BufferedImage image = imageReader.read(0);
        if (image == null) {
            return result;
        }
        image.flush();
        if (imageReader.getFormatName().equals("JPEG")) {
            imageInputStream.seek(imageInputStream.getStreamPosition() - 2);
            final byte[] lastTwoBytes = new byte[2];
            imageInputStream.read(lastTwoBytes);
            if (lastTwoBytes[0] != (byte)0xff || lastTwoBytes[1] != (byte)0xd9) {
                result.setTruncated(true);
            } else {
                result.setTruncated(false);
            }
        }
        result.setImage(true);
    } catch (final IndexOutOfBoundsException e) {
        result.setTruncated(true);
    } catch (final IIOException e) {
        if (e.getCause() instanceof EOFException) {
            result.setTruncated(true);
        }
    } finally {
        digestInputStream.close();
    }
    return result;
}

public class ImageAnalysisResult {
    boolean image;
    boolean truncated;
    public void setImage(boolean image) {
        this.image = image;
    }
    public void setTruncated(boolean truncated) {
        this.truncated = truncated;
    }
 }
}

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