ListKeysVersioningEnabledBucket.java

// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-s3-developer-guide/blob/master/LICENSE-SAMPLECODE.)

import java.io.IOException;

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.ListVersionsRequest;
import com.amazonaws.services.s3.model.S3VersionSummary;
import com.amazonaws.services.s3.model.VersionListing;

public class ListKeysVersioningEnabledBucket {

    public static void main(String[] args) throws IOException {
        String clientRegion = "*** Client region ***";
        String bucketName = "*** Bucket name ***";
        
        try {
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                                    .withCredentials(new ProfileCredentialsProvider())
                                    .withRegion(clientRegion)
                                    .build();
            
            // Retrieve the list of versions. If the bucket contains more versions
            // than the specified maximum number of results, Amazon S3 returns
            // one page of results per request.
            ListVersionsRequest request = new ListVersionsRequest()
                .withBucketName(bucketName)
                .withMaxResults(2);
            VersionListing versionListing = s3Client.listVersions(request); 
            int numVersions = 0, numPages = 0;
            while(true) {
                numPages++;
                for (S3VersionSummary objectSummary : 
                    versionListing.getVersionSummaries()) {
                    System.out.printf("Retrieved object %s, version %s\n", 
                                            objectSummary.getKey(), 
                                            objectSummary.getVersionId());
                    numVersions++;
                }
                // Check whether there are more pages of versions to retrieve. If
                // there are, retrieve them. Otherwise, exit the loop.
                if(versionListing.isTruncated()) {
                    versionListing = s3Client.listNextBatchOfVersions(versionListing);
                }
                else {
                    break;
                }
            }
            System.out.println(numVersions + " object versions retrieved in " + numPages + " pages");
         } 
        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();
        }
    }
}