错误提示

获取图片失败: Invalid argument to native writeImage

源代码

Java
    public static byte[] getUrlImageBytes(String url, int width, int height) {
        try {
            // 直接从网络读取图片并调整大小
            BufferedImage image = Thumbnails.of(new URL(url)).size(width, height).asBufferedImage();
            try(ByteArrayOutputStream baos = new ByteArrayOutputStream()){
                ImageIO.write(image, "jpg", baos);
                return baos.toByteArray();
            }
        } catch (IOException e) {
            log.error("获取图片失败: " + e.getMessage());
        }
        return null;
    }

原因

图片实际大小小于Thumbnails设置的大小，导致缩放失败，从而获取图片失败

解决方法

java
public static byte[] getUrlImageBytes(String url, int width, int height) {
    try {
        // 从网络读取图片
        BufferedImage image = ImageIO.read(new URL(url));
        if (image == null) {
            log.error("获取图片失败: 图片为空");
            return null;
        }

        // 获取原始图片的宽高
        int originalWidth = image.getWidth();
        int originalHeight = image.getHeight();

        // 如果原始图片的尺寸小于目标尺寸，则不进行缩放
        if (originalWidth < width || originalHeight < height) {
            width = originalWidth;
            height = originalHeight;
        }

        // 调整图片大小
        BufferedImage resizedImage = Thumbnails.of(image).size(width, height).asBufferedImage();

        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            ImageIO.write(resizedImage, "jpg", baos);
            return baos.toByteArray();
        }
    } catch (IOException e) {
        log.error("获取图片失败: " + e.getMessage());
    }
    return null;
}