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Lavorare con Amazon S3 oggetti
Un oggetto Amazon S3 rappresenta un file o una raccolta di dati. Ogni oggetto deve essere contenuto in un bucket.
Nota
Best practice
Ti consigliamo di abilitare la regola del AbortIncompleteMultipartUploadciclo di vita nei tuoi bucket. Amazon S3
Questa regola indica a Amazon S3 di interrompere l'esecuzione di caricamenti in più parti che non sono stati completati entro un determinato numero di giorni dopo l'avvio. Quando questo limite di tempo impostato viene superato, Amazon S3 interrompe il caricamento ed elimina i dati di caricamento incompleti.
Per ulteriori informazioni, consulta Lifecycle Configuration for a Bucket with Versioning nella Guida per l'utente. Amazon Simple Storage Service
Nota
Questi frammenti di codice presuppongono che tu abbia compreso il materiale di base e che tu abbia configurato le credenziali predefinite utilizzando le informazioni in. AWS Configurazione per l'accesso Single Sign-On per l'SDK
Argomenti
Caricamento di un oggetto
Crea un file PutObjectRequestputObject
metodo di S3Client con un RequestBodyPutObjectRequest
Il bucket deve esistere; in caso contrario il servizio restituirà un errore.
Importazioni
import java.io.IOException; import java.nio.ByteBuffer; import java.util.Random; import software.amazon.awssdk.core.waiters.WaiterResponse; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.paginators.ListObjectsV2Iterable; import software.amazon.awssdk.core.sync.RequestBody; import software.amazon.awssdk.services.s3.model.S3Exception; import software.amazon.awssdk.services.s3.model.PutObjectRequest; import software.amazon.awssdk.services.s3.model.ListObjectsV2Request; import software.amazon.awssdk.services.s3.model.ListObjectsV2Response; import software.amazon.awssdk.services.s3.model.S3Object; import software.amazon.awssdk.services.s3.model.GetObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteBucketRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadResponse; import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload; import software.amazon.awssdk.services.s3.model.CreateBucketRequest; import software.amazon.awssdk.services.s3.model.CompletedPart; import software.amazon.awssdk.services.s3.model.CreateBucketConfiguration; import software.amazon.awssdk.services.s3.model.UploadPartRequest; import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadRequest; import software.amazon.awssdk.services.s3.waiters.S3Waiter; import software.amazon.awssdk.services.s3.model.HeadBucketRequest; import software.amazon.awssdk.services.s3.model.HeadBucketResponse;
Codice
Region region = Region.US_WEST_2; s3 = S3Client.builder() .region(region) .build(); createBucket(s3, bucketName, region); PutObjectRequest objectRequest = PutObjectRequest.builder() .bucket(bucketName) .key(key) .build(); s3.putObject(objectRequest, RequestBody.fromByteBuffer(getRandomByteBuffer(10_000)));
Vedi l'esempio completo
Caricamento di oggetti in più parti
Usa il createMultipartUpload
metodo di S3Client per ottenere un ID di caricamento. Quindi, utilizzare il metodo uploadPart
per caricare ogni parte. Infine, usa il completeMultipartUpload
metodo di S3Client per dire Amazon S3 di unire tutte le parti caricate e completare l'operazione di caricamento.
Importazioni
import java.io.IOException; import java.nio.ByteBuffer; import java.util.Random; import software.amazon.awssdk.core.waiters.WaiterResponse; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.paginators.ListObjectsV2Iterable; import software.amazon.awssdk.core.sync.RequestBody; import software.amazon.awssdk.services.s3.model.S3Exception; import software.amazon.awssdk.services.s3.model.PutObjectRequest; import software.amazon.awssdk.services.s3.model.ListObjectsV2Request; import software.amazon.awssdk.services.s3.model.ListObjectsV2Response; import software.amazon.awssdk.services.s3.model.S3Object; import software.amazon.awssdk.services.s3.model.GetObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteBucketRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadResponse; import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload; import software.amazon.awssdk.services.s3.model.CreateBucketRequest; import software.amazon.awssdk.services.s3.model.CompletedPart; import software.amazon.awssdk.services.s3.model.CreateBucketConfiguration; import software.amazon.awssdk.services.s3.model.UploadPartRequest; import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadRequest; import software.amazon.awssdk.services.s3.waiters.S3Waiter; import software.amazon.awssdk.services.s3.model.HeadBucketRequest; import software.amazon.awssdk.services.s3.model.HeadBucketResponse;
Codice
// First create a multipart upload and get the upload id CreateMultipartUploadRequest createMultipartUploadRequest = CreateMultipartUploadRequest.builder() .bucket(bucketName) .key(key) .build(); CreateMultipartUploadResponse response = s3.createMultipartUpload(createMultipartUploadRequest); String uploadId = response.uploadId(); System.out.println(uploadId); // Upload all the different parts of the object UploadPartRequest uploadPartRequest1 = UploadPartRequest.builder() .bucket(bucketName) .key(key) .uploadId(uploadId) .partNumber(1).build(); String etag1 = s3 .uploadPart(uploadPartRequest1, RequestBody.fromByteBuffer(getRandomByteBuffer(5 * mB))) .eTag(); CompletedPart part1 = CompletedPart.builder().partNumber(1).eTag(etag1).build(); UploadPartRequest uploadPartRequest2 = UploadPartRequest.builder().bucket(bucketName).key(key) .uploadId(uploadId) .partNumber(2).build(); String etag2 = s3 .uploadPart(uploadPartRequest2, RequestBody.fromByteBuffer(getRandomByteBuffer(3 * mB))) .eTag(); CompletedPart part2 = CompletedPart.builder().partNumber(2).eTag(etag2).build(); // Finally call completeMultipartUpload operation to tell S3 to merge all // uploaded // parts and finish the multipart operation. CompletedMultipartUpload completedMultipartUpload = CompletedMultipartUpload.builder() .parts(part1, part2) .build(); CompleteMultipartUploadRequest completeMultipartUploadRequest = CompleteMultipartUploadRequest.builder() .bucket(bucketName) .key(key) .uploadId(uploadId) .multipartUpload(completedMultipartUpload) .build(); s3.completeMultipartUpload(completeMultipartUploadRequest);
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Eliminazione di un oggetto
Crea un DeleteObjectRequestdeleteObject
metodo di S3Client e passagli il nome di un bucket e di un oggetto da eliminare. Il bucket e la chiave dell'oggetto specificati devono esistere; in caso contrario il servizio restituirà un errore.
Importazioni
import java.io.IOException; import java.nio.ByteBuffer; import java.util.Random; import software.amazon.awssdk.core.waiters.WaiterResponse; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.paginators.ListObjectsV2Iterable; import software.amazon.awssdk.core.sync.RequestBody; import software.amazon.awssdk.services.s3.model.S3Exception; import software.amazon.awssdk.services.s3.model.PutObjectRequest; import software.amazon.awssdk.services.s3.model.ListObjectsV2Request; import software.amazon.awssdk.services.s3.model.ListObjectsV2Response; import software.amazon.awssdk.services.s3.model.S3Object; import software.amazon.awssdk.services.s3.model.GetObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteObjectRequest; import software.amazon.awssdk.services.s3.model.DeleteBucketRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadRequest; import software.amazon.awssdk.services.s3.model.CreateMultipartUploadResponse; import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload; import software.amazon.awssdk.services.s3.model.CreateBucketRequest; import software.amazon.awssdk.services.s3.model.CompletedPart; import software.amazon.awssdk.services.s3.model.CreateBucketConfiguration; import software.amazon.awssdk.services.s3.model.UploadPartRequest; import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadRequest; import software.amazon.awssdk.services.s3.waiters.S3Waiter; import software.amazon.awssdk.services.s3.model.HeadBucketRequest; import software.amazon.awssdk.services.s3.model.HeadBucketResponse;
Codice
DeleteObjectRequest deleteObjectRequest = DeleteObjectRequest.builder() .bucket(bucketName) .key(key) .build(); s3.deleteObject(deleteObjectRequest);
Vedi l'esempio completo
Copia di un oggetto
Crea CopyObjectRequestcopyObject
CopyObjectRequest
Importazioni
import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.CopyObjectRequest; import software.amazon.awssdk.services.s3.model.CopyObjectResponse; import software.amazon.awssdk.services.s3.model.S3Exception;
Codice
import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.CopyObjectRequest; import software.amazon.awssdk.services.s3.model.CopyObjectResponse; import software.amazon.awssdk.services.s3.model.S3Exception; /** * 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 CopyObject { public static void main(String[] args) { final String usage = """ Usage: <objectKey> <fromBucket> <toBucket> Where: objectKey - The name of the object (for example, book.pdf). fromBucket - The S3 bucket name that contains the object (for example, bucket1). toBucket - The S3 bucket to copy the object to (for example, bucket2). """; if (args.length != 3) { System.out.println(usage); System.exit(1); } String objectKey = args[0]; String fromBucket = args[1]; String toBucket = args[2]; System.out.format("Copying object %s from bucket %s to %s\n", objectKey, fromBucket, toBucket); Region region = Region.US_EAST_1; S3Client s3 = S3Client.builder() .region(region) .build(); copyBucketObject(s3, fromBucket, objectKey, toBucket); s3.close(); } public static String copyBucketObject(S3Client s3, String fromBucket, String objectKey, String toBucket) { CopyObjectRequest copyReq = CopyObjectRequest.builder() .sourceBucket(fromBucket) .sourceKey(objectKey) .destinationBucket(toBucket) .destinationKey(objectKey) .build(); try { CopyObjectResponse copyRes = s3.copyObject(copyReq); return copyRes.copyObjectResult().toString(); } catch (S3Exception e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } }
Vedi l'esempio completo
Elenca oggetti
Crea un ListObjectsRequestlistObjects
metodo di S3Client e passa l'oggetto. ListObjectsRequest
Questo metodo restituisce un oggetto ListObjectsResponse
Importazioni
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;
Codice
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; } }
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Altri esempi
La sezione Esempi di codice di questa guida contiene altri esempi di utilizzo di oggetti Amazon S3, tra cui come scaricare un oggetto.