Usar ListObjectsV2
com o AWS SDK ou a CLI
Os exemplos de código a seguir mostram como usar o ListObjectsV2
.
Exemplos de ações são trechos de código de programas maiores e devem ser executados em contexto. É possível ver essa ação no contexto no seguinte exemplo de código:
- .NET
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- AWS SDK for .NET
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. /// <summary> /// Shows how to list the objects in an Amazon S3 bucket. /// </summary> /// <param name="client">An initialized Amazon S3 client object.</param> /// <param name="bucketName">The name of the bucket for which to list /// the contents.</param> /// <returns>A boolean value indicating the success or failure of the /// copy operation.</returns> public static async Task<bool> ListBucketContentsAsync(IAmazonS3 client, string bucketName) { try { var request = new ListObjectsV2Request { BucketName = bucketName, MaxKeys = 5, }; Console.WriteLine("--------------------------------------"); Console.WriteLine($"Listing the contents of {bucketName}:"); Console.WriteLine("--------------------------------------"); ListObjectsV2Response response; do { response = await client.ListObjectsV2Async(request); response.S3Objects .ForEach(obj => Console.WriteLine($"{obj.Key,-35}{obj.LastModified.ToShortDateString(),10}{obj.Size,10}")); // If the response is truncated, set the request ContinuationToken // from the NextContinuationToken property of the response. request.ContinuationToken = response.NextContinuationToken; } while (response.IsTruncated); return true; } catch (AmazonS3Exception ex) { Console.WriteLine($"Error encountered on server. Message:'{ex.Message}' getting list of objects."); return false; } }
Liste objetos com um paginador.
using System; using System.Threading.Tasks; using Amazon.S3; using Amazon.S3.Model; /// <summary> /// The following example lists objects in an Amazon Simple Storage /// Service (Amazon S3) bucket. /// </summary> public class ListObjectsPaginator { private const string BucketName = "doc-example-bucket"; public static async Task Main() { IAmazonS3 s3Client = new AmazonS3Client(); Console.WriteLine($"Listing the objects contained in {BucketName}:\n"); await ListingObjectsAsync(s3Client, BucketName); } /// <summary> /// This method uses a paginator to retrieve the list of objects in an /// an Amazon S3 bucket. /// </summary> /// <param name="client">An Amazon S3 client object.</param> /// <param name="bucketName">The name of the S3 bucket whose objects /// you want to list.</param> public static async Task ListingObjectsAsync(IAmazonS3 client, string bucketName) { var listObjectsV2Paginator = client.Paginators.ListObjectsV2(new ListObjectsV2Request { BucketName = bucketName, }); await foreach (var response in listObjectsV2Paginator.Responses) { Console.WriteLine($"HttpStatusCode: {response.HttpStatusCode}"); Console.WriteLine($"Number of Keys: {response.KeyCount}"); foreach (var entry in response.S3Objects) { Console.WriteLine($"Key = {entry.Key} Size = {entry.Size}"); } } } }
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for .NET.
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- Bash
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- AWS CLI com script Bash
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. ############################################################################### # function errecho # # This function outputs everything sent to it to STDERR (standard error output). ############################################################################### function errecho() { printf "%s\n" "$*" 1>&2 } ############################################################################### # function list_items_in_bucket # # This function displays a list of the files in the bucket with each file's # size. The function uses the --query parameter to retrieve only the key and # size fields from the Contents collection. # # Parameters: # $1 - The name of the bucket. # # Returns: # The list of files in text format. # And: # 0 - If successful. # 1 - If it fails. ############################################################################### function list_items_in_bucket() { local bucket_name=$1 local response response=$(aws s3api list-objects \ --bucket "$bucket_name" \ --output text \ --query 'Contents[].{Key: Key, Size: Size}') # shellcheck disable=SC2181 if [[ ${?} -eq 0 ]]; then echo "$response" else errecho "ERROR: AWS reports s3api list-objects operation failed.\n$response" return 1 fi }
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Para obter detalhes da API, consulte ListObjectsV2 na Referência de comandos da AWS CLI.
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- C++
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- SDK para C++
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. bool AwsDoc::S3::listObjects(const Aws::String &bucketName, Aws::Vector<Aws::String> &keysResult, const Aws::S3::S3ClientConfiguration &clientConfig) { Aws::S3::S3Client s3Client(clientConfig); Aws::S3::Model::ListObjectsV2Request request; request.WithBucket(bucketName); Aws::String continuationToken; // Used for pagination. Aws::Vector<Aws::S3::Model::Object> allObjects; do { if (!continuationToken.empty()) { request.SetContinuationToken(continuationToken); } auto outcome = s3Client.ListObjectsV2(request); if (!outcome.IsSuccess()) { std::cerr << "Error: listObjects: " << outcome.GetError().GetMessage() << std::endl; return false; } else { Aws::Vector<Aws::S3::Model::Object> objects = outcome.GetResult().GetContents(); allObjects.insert(allObjects.end(), objects.begin(), objects.end()); continuationToken = outcome.GetResult().GetNextContinuationToken(); } } while (!continuationToken.empty()); std::cout << allObjects.size() << " object(s) found:" << std::endl; for (const auto &object: allObjects) { std::cout << " " << object.GetKey() << std::endl; keysResult.push_back(object.GetKey()); } return true; }
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for C++.
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- CLI
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- AWS CLI
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Como obter uma lista dos objetos em um bucket
O exemplo de
list-objects-v2
a seguir lista os objetos no bucket especificado.aws s3api list-objects-v2 \ --bucket
my-bucket
Saída:
{ "Contents": [ { "LastModified": "2019-11-05T23:11:50.000Z", "ETag": "\"621503c373607d548b37cff8778d992c\"", "StorageClass": "STANDARD", "Key": "doc1.rtf", "Size": 391 }, { "LastModified": "2019-11-05T23:11:50.000Z", "ETag": "\"a2cecc36ab7c7fe3a71a273b9d45b1b5\"", "StorageClass": "STANDARD", "Key": "doc2.rtf", "Size": 373 }, { "LastModified": "2019-11-05T23:11:50.000Z", "ETag": "\"08210852f65a2e9cb999972539a64d68\"", "StorageClass": "STANDARD", "Key": "doc3.rtf", "Size": 399 }, { "LastModified": "2019-11-05T23:11:50.000Z", "ETag": "\"d1852dd683f404306569471af106988e\"", "StorageClass": "STANDARD", "Key": "doc4.rtf", "Size": 6225 } ] }
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Para obter detalhes da API, consulte ListObjectsV2
na Referência de comandos da AWS CLI.
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- Go
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- SDK para Go V2
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. // BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions // used in the examples. // It contains S3Client, an Amazon S3 service client that is used to perform bucket // and object actions. type BucketBasics struct { S3Client *s3.Client } // ListObjects lists the objects in a bucket. func (basics BucketBasics) ListObjects(bucketName string) ([]types.Object, error) { result, err := basics.S3Client.ListObjectsV2(context.TODO(), &s3.ListObjectsV2Input{ Bucket: aws.String(bucketName), }) var contents []types.Object if err != nil { log.Printf("Couldn't list objects in bucket %v. Here's why: %v\n", bucketName, err) } else { contents = result.Contents } return contents, err }
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Para obter detalhes da API, consulte ListObjectsV2
na Referência da API AWS SDK for Go.
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- Java
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- SDK para Java 2.x
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.ListObjectsRequest; import software.amazon.awssdk.services.s3.model.ListObjectsResponse; import software.amazon.awssdk.services.s3.model.S3Exception; import software.amazon.awssdk.services.s3.model.S3Object; import java.util.List; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class ListObjects { public static void main(String[] args) { final String usage = """ Usage: <bucketName>\s Where: bucketName - The Amazon S3 bucket from which objects are read.\s """; if (args.length != 1) { System.out.println(usage); System.exit(1); } String bucketName = args[0]; Region region = Region.US_EAST_1; S3Client s3 = S3Client.builder() .region(region) .build(); listBucketObjects(s3, bucketName); s3.close(); } public static void listBucketObjects(S3Client s3, String bucketName) { try { ListObjectsRequest listObjects = ListObjectsRequest .builder() .bucket(bucketName) .build(); ListObjectsResponse res = s3.listObjects(listObjects); List<S3Object> objects = res.contents(); for (S3Object myValue : objects) { System.out.print("\n The name of the key is " + myValue.key()); System.out.print("\n The object is " + calKb(myValue.size()) + " KBs"); System.out.print("\n The owner is " + myValue.owner()); } } catch (S3Exception e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } // convert bytes to kbs. private static long calKb(Long val) { return val / 1024; } }
Liste objetos usando paginação.
import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.ListObjectsV2Request; import software.amazon.awssdk.services.s3.model.S3Exception; import software.amazon.awssdk.services.s3.paginators.ListObjectsV2Iterable; public class ListObjectsPaginated { public static void main(String[] args) { final String usage = """ Usage: <bucketName>\s Where: bucketName - The Amazon S3 bucket from which objects are read.\s """; if (args.length != 1) { System.out.println(usage); System.exit(1); } String bucketName = args[0]; Region region = Region.US_EAST_1; S3Client s3 = S3Client.builder() .region(region) .build(); listBucketObjects(s3, bucketName); s3.close(); } public static void listBucketObjects(S3Client s3, String bucketName) { try { ListObjectsV2Request listReq = ListObjectsV2Request.builder() .bucket(bucketName) .maxKeys(1) .build(); ListObjectsV2Iterable listRes = s3.listObjectsV2Paginator(listReq); listRes.stream() .flatMap(r -> r.contents().stream()) .forEach(content -> System.out.println(" Key: " + content.key() + " size = " + content.size())); } catch (S3Exception e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for Java 2.x.
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- JavaScript
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- SDK para JavaScript (v3)
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. Liste todos os objetos no bucket. Se houver mais de um objeto, IsTruncated e NextContinuationToken serão usados para iterar a lista completa.
import { S3Client, // This command supersedes the ListObjectsCommand and is the recommended way to list objects. ListObjectsV2Command, } from "@aws-sdk/client-s3"; const client = new S3Client({}); export const main = async () => { const command = new ListObjectsV2Command({ Bucket: "my-bucket", // The default and maximum number of keys returned is 1000. This limits it to // one for demonstration purposes. MaxKeys: 1, }); try { let isTruncated = true; console.log("Your bucket contains the following objects:\n"); let contents = ""; while (isTruncated) { const { Contents, IsTruncated, NextContinuationToken } = await client.send(command); const contentsList = Contents.map((c) => ` • ${c.Key}`).join("\n"); contents += contentsList + "\n"; isTruncated = IsTruncated; command.input.ContinuationToken = NextContinuationToken; } console.log(contents); } catch (err) { console.error(err); } };
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for JavaScript.
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- Kotlin
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- SDK para Kotlin
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. suspend fun listBucketObjects(bucketName: String) { val request = ListObjectsRequest { bucket = bucketName } S3Client { region = "us-east-1" }.use { s3 -> val response = s3.listObjects(request) response.contents?.forEach { myObject -> println("The name of the key is ${myObject.key}") println("The object is ${myObject.size?.let { calKb(it) }} KBs") println("The owner is ${myObject.owner}") } } } private fun calKb(intValue: Long): Long = intValue / 1024
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Para obter detalhes da API, consulte ListObjectsV2
na Referência da API AWS SDK para Kotlin.
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- PHP
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- SDK para PHP
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. Liste objetos em um bucket.
$s3client = new Aws\S3\S3Client(['region' => 'us-west-2']); try { $contents = $this->s3client->listObjectsV2([ 'Bucket' => $this->bucketName, ]); echo "The contents of your bucket are: \n"; foreach ($contents['Contents'] as $content) { echo $content['Key'] . "\n"; } } catch (Exception $exception) { echo "Failed to list objects in $this->bucketName with error: " . $exception->getMessage(); exit("Please fix error with listing objects before continuing."); }
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for PHP.
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- Python
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- SDK para Python (Boto3).
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. class ObjectWrapper: """Encapsulates S3 object actions.""" def __init__(self, s3_object): """ :param s3_object: A Boto3 Object resource. This is a high-level resource in Boto3 that wraps object actions in a class-like structure. """ self.object = s3_object self.key = self.object.key @staticmethod def list(bucket, prefix=None): """ Lists the objects in a bucket, optionally filtered by a prefix. :param bucket: The bucket to query. This is a Boto3 Bucket resource. :param prefix: When specified, only objects that start with this prefix are listed. :return: The list of objects. """ try: if not prefix: objects = list(bucket.objects.all()) else: objects = list(bucket.objects.filter(Prefix=prefix)) logger.info( "Got objects %s from bucket '%s'", [o.key for o in objects], bucket.name ) except ClientError: logger.exception("Couldn't get objects for bucket '%s'.", bucket.name) raise else: return objects
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK para Python (Boto3).
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- Ruby
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- SDK para Ruby
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. require "aws-sdk-s3" # Wraps Amazon S3 bucket actions. class BucketListObjectsWrapper attr_reader :bucket # @param bucket [Aws::S3::Bucket] An existing Amazon S3 bucket. def initialize(bucket) @bucket = bucket end # Lists object in a bucket. # # @param max_objects [Integer] The maximum number of objects to list. # @return [Integer] The number of objects listed. def list_objects(max_objects) count = 0 puts "The objects in #{@bucket.name} are:" @bucket.objects.each do |obj| puts "\t#{obj.key}" count += 1 break if count == max_objects end count rescue Aws::Errors::ServiceError => e puts "Couldn't list objects in bucket #{bucket.name}. Here's why: #{e.message}" 0 end end # Example usage: def run_demo bucket_name = "doc-example-bucket" wrapper = BucketListObjectsWrapper.new(Aws::S3::Bucket.new(bucket_name)) count = wrapper.list_objects(25) puts "Listed #{count} objects." end run_demo if $PROGRAM_NAME == __FILE__
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK for Ruby.
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- Rust
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- SDK para Rust
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. pub async fn list_objects(client: &Client, bucket: &str) -> Result<(), Error> { let mut response = client .list_objects_v2() .bucket(bucket.to_owned()) .max_keys(10) // In this example, go 10 at a time. .into_paginator() .send(); while let Some(result) = response.next().await { match result { Ok(output) => { for object in output.contents() { println!(" - {}", object.key().unwrap_or("Unknown")); } } Err(err) => { eprintln!("{err:?}") } } } Ok(()) }
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Para obter detalhes da API, consulte ListObjectsV2
na Referência da API AWS SDK para Rust.
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- SAP ABAP
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- SDK para SAP ABAP
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nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. TRY. oo_result = lo_s3->listobjectsv2( " oo_result is returned for testing purposes. " iv_bucket = iv_bucket_name ). MESSAGE 'Retrieved list of objects in S3 bucket.' TYPE 'I'. CATCH /aws1/cx_s3_nosuchbucket. MESSAGE 'Bucket does not exist.' TYPE 'E'. ENDTRY.
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Para obter detalhes da API, consulte ListObjectsV2 na Referência da API AWS SDK para SAP ABAP.
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- Swift
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- SDK para Swift
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nota
Esta é a documentação de pré-lançamento de um SDK na versão de visualização. Está sujeita a alteração.
nota
Há mais no GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS
. public func listBucketFiles(bucket: String) async throws -> [String] { let input = ListObjectsV2Input( bucket: bucket ) let output = try await client.listObjectsV2(input: input) var names: [String] = [] guard let objList = output.contents else { return [] } for obj in objList { if let objName = obj.key { names.append(objName) } } return names }
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Para obter detalhes da API, consulte ListObjectsV2
na Referência da API do AWS SDK para Swift.
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Para obter uma lista completa dos Guias do desenvolvedor do SDK da AWS e exemplos de código, consulte Usar este serviço com um AWS SDK. Este tópico também inclui informações sobre como começar e detalhes sobre versões anteriores do SDK.