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1public void saveFile(MultipartFile multipartFile) throws AmazonServiceException, SdkClientException, IOException {
2    ObjectMetadata data = new ObjectMetadata();
3    data.setContentType(multipartFile.getContentType());
4    data.setContentLength(multipartFile.getSize());
5    BasicAWSCredentials creds = new BasicAWSCredentials("accessKey", "secretKey");
6    AmazonS3 s3client = AmazonS3ClientBuilder.standard().withRegion(Regions.US_EAST_2).withCredentials(new AWSStaticCredentialsProvider(creds)).build();
7    PutObjectResult objectResult = s3client.putObject("myBucket", multipartFile.getOriginalFilename(), multipartFile.getInputStream(), data);
8    System.out.println(objectResult.getContentMd5()); //you can verify MD5
9}