java - 来自 S3Object 的 BufferedImage

Question

如何从 S3Object 获取 BufferedImage？我想我想念 ImageIO 阅读器的一些东西？！这是我尝试过的。它抛出一个 NullPointerException：

S3Object o = s3Client.getObject("testbucket", "test.jpeg");
logger.debug(o.getObjectMetadata().getContentLength()); // 25890
logger.debug(o.getObjectMetadata().getContentType()); // image/jpeg

ImageInputStream iin = ImageIO.createImageInputStream(o.getObjectContent());
BufferedImage img = ImageIO.read(iin);  

logger.debug(img.getHeight()); // NullPointerException

感谢您的帮助！