Java 异常：读取PNG头时发生I/O错误！用于图像读取大小

这是我的代码：

private Rectangle getImageUriImageSize(String uri) {
        Matcher matcher = dataUriPattern.matcher(uri);
        if (!matcher.find()) return null;
        byte[] bytes = DatatypeConverter.parseBase64Binary(matcher.group(2));
        ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
        Rectangle rectangle = null;
        try {
            BufferedImage bufferedImage = ImageIO.read(inputStream);
            if (bufferedImage != null) {
                rectangle = new Rectangle(0, 0, bufferedImage.getWidth(), bufferedImage.getHeight());
            }
        } catch (IOException e) {
            logger.warn("Error occurred when reading base64 Data URI: '{}'", e.getMessage());
        } finally {
            IOUtils.closeQuietly(inputStream);
        }
        return rectangle;
    }

这是错误的

exception: I/O error reading PNG header!

我改变了这个建议

但这次我犯了错误。我使用docker，这个容器退出

那怎么办呢

还有这个

 public Rectangle getImageSize(String currentMerchant, String relativeUrl) {logger.info("getImageSize");
        String imageUrl = getImageUrl(currentMerchant, relativeUrl);
        Rectangle rect = null;
        FileImageInputStream imageInputStream = null;
        try {
            File downloadedImageFile = restTemplate.execute(
                imageUrl,
                HttpMethod.GET,
                null,
                response -> {
                    InputStream inputStream = response.getBody();
                    String fileName = getFileName(relativeUrl);
                    return saveInputStreamAs(inputStream, fileName);
                }
            );

            Iterator<ImageReader> imageReaders = getImageReaders(downloadedImageFile);
            if (!imageReaders.hasNext()) {
                logger.warn("Cannot find any image reader for file {}", downloadedImageFile);
            }
            ImageReader imageReader = imageReaders.next();
            imageInputStream = new FileImageInputStream(downloadedImageFile);
            imageReader.setInput(imageInputStream, true, true);
            rect = new Rectangle(0, 0, imageReader.getWidth(0), imageReader.getHeight(0));
        } catch (HttpStatusCodeException ex) {
            logger.warn("Error getting image resource from url '{}', status: {}, message: {}", imageUrl, ex.getStatusCode(), ex.getResponseBodyAsString());
        } catch (IOException ex) {
            logger.warn("Could not read image by url '{}', exception: {}", imageUrl, ex.getMessage(), ex);
        } finally {
            IOUtils.closeQuietly(imageInputStream);
        }
        return rect;
    }

---

请检查您传递的文件扩展名。它应该是PNG。

请编辑您的问题，并添加完整的堆栈跟踪和导致异常的图像链接。还有，我不清楚为什么你需要3种不同的方法来做这件事。。。它们是否都因相同的异常而失败？第三个版本将是最快的，因为它只需要读取标题，而不需要解码像素数据。PS：检查了源代码PNGImageReader，PNG似乎已损坏。您应该从堆栈跟踪中获得更多信息。它可能是原始源文件，也可能是由于文件下载代码中的错误。请添加图像链接。您可能需要更改代码，以便它将堆栈跟踪打印到日志中，而不仅仅是异常消息。听起来您的图像实际上是一个JPEG错误标记为PNG。xxd file.png | head-10的前几个字节看起来像什么？@GlennRanders Pehrson似乎你是对的。但是，我不理解该文件如何产生PNGImageReader中提到的异常，因为ImageIO将通过检查字节而不是文件扩展名来查找合适的读取器。这些字节中没有任何内容看起来像PNG。

 public Rectangle getImageSize(String currentMerchant, String relativeUrl) {logger.info("getImageSize");
        String imageUrl = getImageUrl(currentMerchant, relativeUrl);
        Rectangle rect = null;
        FileImageInputStream imageInputStream = null;
        try {
            File downloadedImageFile = restTemplate.execute(
                imageUrl,
                HttpMethod.GET,
                null,
                response -> {
                    InputStream inputStream = response.getBody();
                    String fileName = getFileName(relativeUrl);
                    return saveInputStreamAs(inputStream, fileName);
                }
            );

            Iterator<ImageReader> imageReaders = getImageReaders(downloadedImageFile);
            if (!imageReaders.hasNext()) {
                logger.warn("Cannot find any image reader for file {}", downloadedImageFile);
            }
            ImageReader imageReader = imageReaders.next();
            imageInputStream = new FileImageInputStream(downloadedImageFile);
            imageReader.setInput(imageInputStream, true, true);
            rect = new Rectangle(0, 0, imageReader.getWidth(0), imageReader.getHeight(0));
        } catch (HttpStatusCodeException ex) {
            logger.warn("Error getting image resource from url '{}', status: {}, message: {}", imageUrl, ex.getStatusCode(), ex.getResponseBodyAsString());
        } catch (IOException ex) {
            logger.warn("Could not read image by url '{}', exception: {}", imageUrl, ex.getMessage(), ex);
        } finally {
            IOUtils.closeQuietly(imageInputStream);
        }
        return rect;
    }

catch (IOException ex) {
        logger.warn("Could not read image by url '{}', exception: {}", imageUrl, ex.getMessage(), ex);
    }