AuthUsingAcctOrUserCredJava.md

Making requests using AWS account or IAM user credentials - AWS SDK for Java

To send authenticated requests to Amazon S3 using your AWS account or IAM user credentials, do the following:

• Use the AmazonS3ClientBuilder class to create an AmazonS3Client instance.

• Run one of the AmazonS3Client methods to send requests to Amazon S3. The client generates the necessary signature from the credentials that you provide and includes it in the request.

The following example performs the preceding tasks. For information on creating and testing a working sample, see Testing the Amazon S3 Java Code Examples.

Example

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.ListObjectsRequest;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.S3ObjectSummary;

import java.io.IOException;
import java.util.List;

public class MakingRequests {

    public static void main(String[] args) throws IOException {
        Regions clientRegion = Regions.DEFAULT_REGION;
        String bucketName = "*** Bucket name ***";

        try {
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withCredentials(new ProfileCredentialsProvider())
                    .withRegion(clientRegion)
                    .build();

            // Get a list of objects in the bucket, two at a time, and 
            // print the name and size of each object.
            ListObjectsRequest listRequest = new ListObjectsRequest().withBucketName(bucketName).withMaxKeys(2);
            ObjectListing objects = s3Client.listObjects(listRequest);
            while (true) {
                List<S3ObjectSummary> summaries = objects.getObjectSummaries();
                for (S3ObjectSummary summary : summaries) {
                    System.out.printf("Object \"%s\" retrieved with size %d\n", summary.getKey(), summary.getSize());
                }
                if (objects.isTruncated()) {
                    objects = s3Client.listNextBatchOfObjects(objects);
                } else {
                    break;
                }
            }
        } catch (AmazonServiceException e) {
            // The call was transmitted successfully, but Amazon S3 couldn't process 
            // it, so it returned an error response.
            e.printStackTrace();
        } catch (SdkClientException e) {
            // Amazon S3 couldn't be contacted for a response, or the client
            // couldn't parse the response from Amazon S3.
            e.printStackTrace();
        }
    }
}

Related resources

• Using the AWS SDKs, CLI, and Explorers