Question

我正在尝试从AWS开发工具包V1.x迁移到V2.2。不过，我找不到 deleteObjects 方法。我发现了一堆示例-都是相同的:-(似乎从未使用过对象列表进行删除（即存在该列表，但从未在 DeleteObjectsRequest 中设置）对象-我假定应该在此处设置对象，但看不到哪里。如何/在何处提供对象列表？我找到的示例是：

    System.out.println("Deleting objects from S3 bucket: " + bucket_name);
    for (String k : object_keys) {
        System.out.println(" * " + k);
    }

    Region region = Region.US_WEST_2;
    S3Client s3 = S3Client.builder().region(region).build();
    try {
        DeleteObjectsRequest dor = DeleteObjectsRequest.builder()
                .bucket(bucket_name)
                .build();
        s3.deleteObjects(dor);
    } catch (S3Exception e) {
        System.err.println(e.awsErrorDetails().errorMessage());
        System.exit(1);
    }

Answer 1

看起来需要更多对象才能在s3中分配该对象的键。这未经测试，我将指向方法的链接放在最后。

System.out.println("Deleting objects from S3 bucket: " + bucket_name);

for (String k : object_keys) {
    System.out.println(" * " + k);
}

Region region = Region.US_WEST_2;
S3Client s3 = S3Client.builder().region(region).build();

try {

   ObjectIdentifier objectToDelete = ObjectIdentifier.Builder()
            .key(KEY_OBJECT_TO_DELETE);

   Delete delete_me Delete.Builder.objects(objectToDelete) 

   DeleteObjectsRequest dor = DeleteObjectsRequest.builder()
            .bucket(bucket_name)
            .delete(delete_me)
            .build();

    s3.deleteObjects(dor);

} catch (S3Exception e) {
    System.err.println(e.awsErrorDetails().errorMessage());
    System.exit(1);
}

删除键 https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/s3/model/ObjectIdentifier.html#key--

删除对象 https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/s3/model/ObjectIdentifier.Builder.html

Answer 2

即使不是100％完整，以前接受的答案也很有帮助。我用它编写了以下方法。尽管我还没有对它的错误处理进行特别好的测试，但是它基本上可以正常工作。

传入String个键的数组，并将其转换为
的数组 ObjectIdentifier所需要的是deleteObjects。
s3Client和log已在其他地方初始化。如果不需要，请随时删除日志。

该方法当前返回成功删除的次数。

public int deleteS3Objects(String bucketName, String[] keys) {

List<ObjectIdentifier> objIds = Arrays.stream(keys)
        .map(key -> ObjectIdentifier.builder().key(key).build())
        .collect(Collectors.toList());
try {
    DeleteObjectsRequest dor = DeleteObjectsRequest.builder()
            .bucket(bucketName)
            .delete(Delete.builder().objects(objIds).build())
            .build();

    DeleteObjectsResponse delResp = s3client.deleteObjects(dor);

    if (delResp.errors().size() > 0) {
        String err = String.format("%d errors returned while deleting %d objects",
                delResp.errors().size(), objIds.size());
        log.warn(err);
    }
    if (delResp.deleted().size() < objIds.size()) {
        String err = String.format("%d of %d objects deleted",
                delResp.deleted().size(), objIds.size());
        log.warn(err);
    }
    return delResp.deleted().size();
}
catch(AwsServiceException e) {
    // The call was transmitted successfully, but Amazon S3 couldn't process 
    // it, so it returned an error response.
    log.error("Error received from S3 while attempting to delete objects", e);
}
catch(SdkClientException e) {
    // Amazon S3 couldn't be contacted for a response, or the client
    // couldn't parse the response from Amazon S3.
    log.error("Exception occurred while attempting to delete objects from S3", e);
}
return 0;
}

（随意的评论：我发现在AWS开发工具包v2.3.9中，deleteObjects需要Delete.Builder和ObjectIdentifier键，但是getObject和putObject接受却很奇怪字符串键。DeleteObjectsRequest.Builder为什么不只有keys()方法呢？他们还没有正式说SDK是可用于生产的AFAIK，所以其中的某些内容可能会发生变化。）

使用AWS开发工具包V2的deleteObjects吗？

2 个答案: