以编程方式列出对象键

        /// <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("--------------------------------------");

                var response = new ListObjectsV2Response();

                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;
            }
        }

bool AwsDoc::S3::ListObjects(const Aws::String &bucketName,
                             const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::S3::S3Client s3_client(clientConfig);

    Aws::S3::Model::ListObjectsRequest request;
    request.WithBucket(bucketName);

    auto outcome = s3_client.ListObjects(request);

    if (!outcome.IsSuccess()) {
        std::cerr << "Error: ListObjects: " <<
                  outcome.GetError().GetMessage() << std::endl;
    }
    else {
        Aws::Vector<Aws::S3::Model::Object> objects =
                outcome.GetResult().GetContents();

        for (Aws::S3::Model::Object &object: objects) {
            std::cout << object.GetKey() << std::endl;
        }
    }

    return outcome.IsSuccess();
}

	// List objects in the bucket.
	// n.b. object keys in Amazon S3 do not begin with '/'. You do not need to lead your
	// prefix with it.
	fmt.Println("Listing the objects in the bucket:")
	listObjsResponse, err := client.ListObjectsV2(context.TODO(), &s3.ListObjectsV2Input{
		Bucket: aws.String(name),
		Prefix: aws.String(""),
	})

	if err != nil {
		panic("Couldn't list bucket contents")
	}

	for _, object := range listObjsResponse.Contents {
		fmt.Printf("%s (%d bytes, class %v) \n", *object.Key, object.Size, object.StorageClass)
	}

    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;
    }

创建客户端。

// Create service client module using ES6 syntax.
import { S3Client } from "@aws-sdk/client-s3";
// Set the AWS Region.
const REGION = "us-east-1";
// Create an Amazon S3 service client object.
const s3Client = new S3Client({ region: REGION });
export { s3Client };

列出对象。

// Import required AWS SDK clients and commands for Node.js.
import { ListObjectsCommand } from "@aws-sdk/client-s3";
import { s3Client } from "./libs/s3Client.js"; // Helper function that creates an Amazon S3 service client module.

// Create the parameters for the bucket
export const bucketParams = { Bucket: "BUCKET_NAME" };

export const run = async () => {
  try {
    const data = await s3Client.send(new ListObjectsCommand(bucketParams));
    console.log("Success", data);
    return data; // For unit tests.
  } catch (err) {
    console.log("Error", err);
  }
};
run();

列出 1000 个或更多对象。

// Import required AWS SDK clients and commands for Node.js.
import { ListObjectsCommand } from "@aws-sdk/client-s3";
import { s3Client } from "./libs/s3Client.js"; // Helper function that creates an Amazon S3 service client module.

// Create the parameters for the bucket
export const bucketParams = { Bucket: "BUCKET_NAME" };

export async function run() {
  // Declare truncated as a flag that the while loop is based on.
  let truncated = true;
  // Declare a variable to which the key of the last element is assigned to in the response.
  let pageMarker;
  // while loop that runs until 'response.truncated' is false.
  while (truncated) {
    try {
      const response = await s3Client.send(new ListObjectsCommand(bucketParams));
      // return response; //For unit tests
      response.Contents.forEach((item) => {
        console.log(item.Key);
      });
      // Log the key of every item in the response to standard output.
      truncated = response.IsTruncated;
      // If truncated is true, assign the key of the last element in the response to the pageMarker variable.
      if (truncated) {
        pageMarker = response.Contents.slice(-1)[0].Key;
        // Assign the pageMarker value to bucketParams so that the next iteration starts from the new pageMarker.
        bucketParams.Marker = pageMarker;
      }
      // At end of the list, response.truncated is false, and the function exits the while loop.
    } catch (err) {
      console.log("Error", err);
      truncated = false;
    }
  }
}
run();

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 ${calKb(myObject.size)} KBs")
            println("The owner is ${myObject.owner}")
        }
    }
}

private fun calKb(intValue: Long): Long {
    return intValue / 1024
}

列出存储桶中的对象。

$s3client = new Aws\S3\S3Client(['region' => 'us-west-2', 'version' => 'latest']);

try {
    $contents = $s3client->listObjects([
        'Bucket' => $bucket_name,
    ]);
    echo "The contents of your bucket are: \n";
    foreach ($contents['Contents'] as $content) {
        echo $content['Key'] . "\n";
    }
} catch (Exception $exception) {
    echo "Failed to list objects in $bucket_name with error: " . $exception->getMessage();
    exit("Please fix error with listing objects before continuing.");
}

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

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

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__

pub async fn list_objects(client: &Client, bucket_name: &str) -> Result<(), Error> {
    let objects = client.list_objects_v2().bucket(bucket_name).send().await?;
    println!("Objects in bucket:");
    for obj in objects.contents().unwrap_or_default() {
        println!("{:?}", obj.key().unwrap());
    }

    Ok(())
}

    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
    }