列出启用版本控制的存储桶中的对象

// 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();
        }
    }
}

// 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.)

using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    class ListObjectsVersioningEnabledBucketTest
    {
        static string bucketName = "*** bucket name ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 s3Client;

        public static void Main(string[] args)
        {
            s3Client = new AmazonS3Client(bucketRegion);
            GetObjectListWithAllVersionsAsync().Wait();
        }

        static async Task GetObjectListWithAllVersionsAsync()
        {
            try
            {
                ListVersionsRequest request = new ListVersionsRequest()
                {
                    BucketName = bucketName,
                    // You can optionally specify key name prefix in the request
                    // if you want list of object versions of a specific object.

                    // For this example we limit response to return list of 2 versions.
                    MaxKeys = 2
                };
                do
                {
                    ListVersionsResponse response = await s3Client.ListVersionsAsync(request); 
                    // Process response.
                    foreach (S3ObjectVersion entry in response.Versions)
                    {
                        Console.WriteLine("key = {0} size = {1}",
                            entry.Key, entry.Size);
                    }

                    // If response is truncated, set the marker to get the next 
                    // set of keys.
                    if (response.IsTruncated)
                    {
                        request.KeyMarker = response.NextKeyMarker;
                        request.VersionIdMarker = response.NextVersionIdMarker;
                    }
                    else
                    {
                        request = null;
                    }
                } while (request != null);
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered on server. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
        }
    }
}

以下示例将检索其键是 myObject 或由它开头的对象。

GET /?versions&prefix=myObject HTTP/1.1
Host: bucket.s3.amazonaws.com.cn
Date: Wed, 28 Oct 2009 22:32:00 GMT
Authorization: AWS AKIAIOSFODNN7EXAMPLE:0RQf4/cRonhpaBX5sCYVf1bNRuU=

GET /?versions&key-marker=myObject&version-id-marker=298459348571 HTTP/1.1
Host: bucket.s3.amazonaws.com.cn
Date: Wed, 28 Oct 2009 22:32:00 GMT
Authorization: AWS AKIAIOSFODNN7EXAMPLE:0RQf4/cRonhpaBX5sCYVf1bNRuU=