How to fetch Azure Blob Content Using Java from Azure Functions

Question

I am creating Azure function using Java, My requirement I need to copy blob from one container to another container with encryption

so, for encrypting blob I am adding 4bites before and after the blob while uploading to sink container

now, I need to fetch blob content, for this I found one class in azure i.e,

@BlobInput(
 name = "InputFileName", 
 dataType = "binary", 
 path = sourceContainerName+"/{InputFileName}") 
 byte[] content,

Here byte[] content, fetching content of blob

but I am facing some errors like, if I pass any file name as InputFileName parameter it is giving 200ok means returning successful. also it is difficult to mefor exception handling

so I am looking for other ways for fetching blob content.... please answer me if any methods or classes we have

Answer 1

If you are looking for more control, instead of using the bindings, you can use the Azure Storage SDK directly. Check out the quickstart doc for getting setup.

This sample code has full end-to-end code that you could build upon. Here is the code that you are looking for in it for reference

String data = "Hello world!";
InputStream dataStream = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));

/*
 * Create the blob with string (plain text) content.
 */
blobClient.upload(dataStream, data.length());

dataStream.close();

/*
 * Download the blob's content to output stream.
 */
int dataSize = (int) blobClient.getProperties().getBlobSize();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(dataSize);
blobClient.downloadStream(outputStream);
outputStream.close();