7

我正在尝试从 AWS SDK V1.x 迁移到 V2.2。我无法弄清楚deleteObjects方法。我找到了一堆例子——都是一样的 :-( 似乎从来没有使用要删除的对象列表（即列表存在，但从未在DeleteObjectsRequest对象中设置——我认为那是它应该设置，但看不到在哪里）。我如何/在哪里提供对象列表？我找到的例子是：

    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);
    }
4

2 回答 2

10

先前接受的答案非常有帮助，即使它不是 100% 完整。我用它写了下面的方法。虽然我没有特别好地测试它的错误处理，但它基本上可以工作。

  • 传入一个String键数组，将其转换为需要的
    ObjectIdentifier's数组deleteObjects。
  • s3Client并log假定已在别处初始化。如果您不需要它，请随意删除日志记录。

  • 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;
}

（无偿评论：我觉得很奇怪，在 AWS SDK v2.3.9 中，deleteObjects需要Delete.Builder和ObjectIdentifier键但getObject并putObject接受字符串键。为什么不DeleteObjectsRequest.Builder只是有一个keys()方法？他们还没有正式表示 SDK 是生产就绪的 AFAIK 所以一些这可能会发生变化。）

于 2019-02-02T00:13:16.750 回答
7

看起来需要更多的对象来分配 s3 中对象的键。这是未经测试的，我把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

于 2018-12-27T21:21:39.313 回答