将文件上传到Amazon S3存储桶：上传效果很好，但是一些大文件为空

Question

    public void upload(List<CommonsMultipartFile> fileUpload) {
        for(CommonsMultipartFile file : fileUpload)
            {
                try
                {
                    String contentType = file.getContentType();
                    String newName = generateFileKey(file);
                    AmazonS3UploadRequest uploadRequest = new AmazonS3UploadRequest.Builder()
                            .bucket(bucket)
                            .contentType(contentType)
                            .newResourceName(newName)
                            .resourceStream(file.getInputStream(), Long.valueOf(file.getBytes().length))
                            .build();
                    uploadToS3(uploadRequest);
                } 
                catch (Exception e)
                {
                    LOG.error("Error while uploading files to s3: ", e);
                    throw new ServiceRuntimeException("Error writing file to s3 bucket");
                }
            }
    }

   public String uploadToS3(AmazonS3UploadRequest uploadRequest) { 

        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentLength(uploadRequest.getResourceLength());
        objectMetadata.setContentType(uploadRequest.getContentType());
        Upload upload = transferManager.upload(uploadRequest.getBucket(), uploadRequest.getNewResourceName(), uploadRequest.getResourceStream(), objectMetadata);
    }

I am uploading pdf file to amazon S3 bucket, all files are uploaded successfully but large files(15 pages pdf etc) are empty. Amazon transferManager - is being injected through spring. Amazon credentials are injected from .property file in TansferManager. Note : .png/.jpeg files are also being uploaded as empty. Hmm I am kind of confused...what's happening. need some inputs. Thanks in advance.

Answer 1

Try with FileUpload class from Apache Commons thru Streaming API. The code snippet on that page will work fine.

Answer 2

Try this code to upload your PDF to amazon s3, I assume that you have AWS S3 app Id and secret key.

AWSCredentials credentials = new BasicAWSCredentials(appId, appSecret);
AmazonS3 s3Client = new AmazonS3Client(credentials);

String bucketPath = "YOUR_S3_BUCKET";

public void upload(List < CommonsMultipartFile > fileUpload) {
    for (CommonsMultipartFile file: fileUpload) {
        try {
            String contentType = file.getContentType();
            String pdfName = generateFileKey(file);
            InputStream is = file.getInputStream();
            ObjectMetadata meta = new ObjectMetadata();
            meta.setContentLength(is.available());
            s3Client.putObject(new PutObjectRequest(bucketPath, pdfName, is, meta).withCannedAcl(CannedAccessControlList.PublicRead));
        } catch (Exception e) {
            LOG.error("Error while uploading files to s3: ", e);
            throw new ServiceRuntimeException("Error writing file to s3 bucket");
        }
    }
}