How to download s3 object directly into memory in java

Question

Is it possible to download S3object in Java directly into memory and get it removed when i'm done with the task?

Answer 1

Use the AWS SDK for Java and Apache Commons IO as such:

//import org.apache.commons.io.IOUtils  AmazonS3 s3  = new AmazonS3Client(credentials);  // anonymous credentials are possible if this isn't your bucket S3Object object = s3.getObject("bucket", "key");  byte[] byteArray = IOUtils.toByteArray(object.getObjectContent()); 

Not sure what you mean by "get it removed", but IOUtils will close the object's input stream when it's done converting it to a byte array. If you mean you want to delete the object from s3, that's as easy as:

s3.deleteObject("bucket", "key");  

Answer 2

As of AWS JAVA SDK 2 you can you use ReponseTransformer to convert the response to different types. (See javadoc).

Below is the example for getting the object as bytes

GetObjectRequest request = GetObjectRequest.builder().bucket(bucket).key(key).build() ResponseBytes<GetObjectResponse> result = bytess3Client.getObject(request, ResponseTransformer.toBytes())  // to get the bytes result.asByteArray()