Example upload multipart s3

test.java

public void uploadFile(MultipartFile file) throws IOException{
        long contentLength = file.getBytes().length;
        long partSize = 5 * 1024 * 1024;
        String key = file.getOriginalFilename();
        InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(
                bucket, key);
        InitiateMultipartUploadResult initResponse =
                client.initiateMultipartUpload(initRequest);
        List<PartETag> partETags = new ArrayList<>();
        int partNumber = 1;
        for (long filePosition = 0; filePosition < contentLength; filePosition += partSize) {
            // Last part can be less than 5 MB. Adjust part size.
            partSize = Math.min(partSize, (contentLength - filePosition));
            System.out.println(String.format("%d | %d | %d", partSize, filePosition, contentLength));
            UploadPartRequest uploadRequest = new UploadPartRequest()
                    .withBucketName(bucket).withKey(file.getOriginalFilename())
                    .withUploadId(initResponse.getUploadId()).withPartNumber(partNumber)
                    .withFileOffset(filePosition)
                    .withInputStream(file.getInputStream())
                    .withPartSize(partSize);

            PartETag partETag = client.uploadPart(uploadRequest).getPartETag();
            // Upload part and add response to our list.
            partETags.add(partETag);
            partNumber++;
        }
        CompleteMultipartUploadRequest compRequest = new
                CompleteMultipartUploadRequest(
                bucket,
                file.getOriginalFilename(),
                initResponse.getUploadId(),
                partETags);
        client.completeMultipartUpload(compRequest);
    }