Perform a multipart upload to an Amazon S3 object using an Amazon SDK - Amazon Simple Storage Service
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Perform a multipart upload to an Amazon S3 object using an Amazon SDK

The following code example shows how to perform a multipart upload to an Amazon S3 object.

SDK for Java 2.x

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

The code examples use the following imports.

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import; import; import; import; import; import; import; import; import; import; import; import; import; import; import; import; import java.nio.ByteBuffer; import java.nio.file.Paths; import java.util.ArrayList; import java.util.List; import java.util.Objects; import java.util.UUID;

Use the S3 Transfer Manager on top of the Amazon CRT-based S3 client to transparently perform a multipart upload when the size of the content exceeds a threshold. The default threshold size is 8 MB.

public void multipartUploadWithTransferManager(String filePath) { S3TransferManager transferManager = S3TransferManager.create(); UploadFileRequest uploadFileRequest = UploadFileRequest.builder() .putObjectRequest(b -> b .bucket(bucketName) .key(key)) .source(Paths.get(filePath)) .build(); FileUpload fileUpload = transferManager.uploadFile(uploadFileRequest); fileUpload.completionFuture().join(); transferManager.close(); }

Use the S3Client API or (S3AsyncClient API) to perform a multipart upload.

public void multipartUploadWithS3Client(String filePath) { // Initiate the multipart upload. CreateMultipartUploadResponse createMultipartUploadResponse = s3Client.createMultipartUpload(b -> b .bucket(bucketName) .key(key)); String uploadId = createMultipartUploadResponse.uploadId(); // Upload the parts of the file. int partNumber = 1; List<CompletedPart> completedParts = new ArrayList<>(); ByteBuffer bb = ByteBuffer.allocate(1024 * 1024 * 5); // 5 MB byte buffer try (RandomAccessFile file = new RandomAccessFile(filePath, "r")) { long fileSize = file.length(); int position = 0; while (position < fileSize) {; int read = file.getChannel().read(bb); bb.flip(); // Swap position and limit before reading from the buffer. UploadPartRequest uploadPartRequest = UploadPartRequest.builder() .bucket(bucketName) .key(key) .uploadId(uploadId) .partNumber(partNumber) .build(); UploadPartResponse partResponse = s3Client.uploadPart( uploadPartRequest, RequestBody.fromByteBuffer(bb)); CompletedPart part = CompletedPart.builder() .partNumber(partNumber) .eTag(partResponse.eTag()) .build(); completedParts.add(part); bb.clear(); position += read; partNumber++; } } catch (IOException e) { logger.error(e.getMessage()); } // Complete the multipart upload. s3Client.completeMultipartUpload(b -> b .bucket(bucketName) .key(key) .uploadId(uploadId) .multipartUpload(CompletedMultipartUpload.builder().parts(completedParts).build())); }

For a complete list of Amazon SDK developer guides and code examples, see Using this service with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.