如何编写代码，通过spring引导api查看s3 bucket映像

Question

我为下载编写代码

@GetMapping(value= "/download/{fileName}")
public ResponseEntity<ByteArrayResource> downloadFile(@PathVariable String fileName) {
final byte[] data = amazonClient.downloadFile(fileName);
final ByteArrayResource resource = new ByteArrayResource(data);
return ResponseEntity
.ok()
.contentLength(data.length)
.header("Content-type", "application/octet-stream")
.header("Content-disposition", "attachment; filename="" + fileName + """)
.body(resource);
}

以及服务方法：-

public byte[] downloadFile(final String fileName) {
byte[] content = null;
logger.info("Downloading an object with key= " + fileName);
final S3Object s3Object = s3client.getObject(bucketName, fileName);
final S3ObjectInputStream stream = s3Object.getObjectContent();
try {
content = IOUtils.toByteArray(stream);
logger.info("File downloaded successfully.");
s3Object.close();
} catch(final IOException ex) {
logger.info("IO Error Message= " + ex.getMessage());
}
return content;
}

但我想为唯一的视图编码，而不是下载。

Answer 1

您可以尝试这种方式。。。

AmazonS3 s3Client = new AmazonS3Client(new ProfileCredentialsProvider());        
S3Object object = s3Client.getObject(new GetObjectRequest(bucketName, key));
InputStream objectData = object.getObjectContent();
BufferedImage bf = ImageIO.read(objectData);

使用javax.imageio