Is it possible to download S3object in Java directly into memory and get it removed when i'm done with the task?
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4 Answers
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");
3 Comments
Manisha
Thanks for your help!this would require the use of additional libraries. Wouldn't it be better if i loop through input stream to get the byte array?
Paul Draper
@Manisha, see stackoverflow.com/questions/1264709/….
nbarraille
You can now do this without
org.apache.commons.io. The AWS SDK ships this method in it's own IOUtils: import com.amazonaws.util.IOUtils;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()
Comments
For example, convert file data to string:
S3Object s3object = s3.getObject(new GetObjectRequest(bucketName, key));
S3ObjectInputStream inputStream = s3object.getObjectContent();
StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);
Comments
This is the best practise.
S3Object object = s3.getObject("bucket", "key");
byte[] byteArray = IOUtils.toByteArray(object.getObjectContent());
