Load document from Azure Blob Storage

public static void run() throws Exception
{
    String key = "sample.docx";
    String outputFilePath = new File(Constants.OutputPath, "SignFromStream//signedSample.docx").getPath();
    try {
        ByteArrayOutputStream stream = downloadFile(key);
 
        Signature signature = new Signature(new ByteArrayInputStream(stream.toByteArray()));
 
        QrCodeSignOptions options = new QrCodeSignOptions("JohnSmith");
        options.setEncodeType(QrCodeTypes.QR);
        options.setLeft(100);
        options.setTop(100);
 
 
        // sign document to file
        signature.sign(outputFilePath, options);
 
        System.out.print("\nSource document signed successfully.\nFile saved at " + outputFilePath);
    }catch(Exception e){
        throw new GroupDocsSignatureException(e.getMessage());
    }
}
public static final String STORAGE_CONNECTION_STRING
        = "DefaultEndpointsProtocol=https;"
        + "AccountName=Ram;" //Your account name.
        + "AccountKey=key"; //your account key.
 
public static ByteArrayOutputStream downloadFile(String blobName) throws Exception
{
    CloudBlobContainer container = getContainer();
 
    CloudBlob blob = container.getBlockBlobReference(blobName);
    ByteArrayOutputStream memoryStream = new ByteArrayOutputStream();
    blob.download(memoryStream);
    //memoryStream.Position = 0;
    return memoryStream;
}
 
private static CloudBlobContainer getContainer() throws Exception
{
    String containerName = "***";
 
    CloudStorageAccount cloudStorageAccount = CloudStorageAccount.parse(STORAGE_CONNECTION_STRING);
    CloudBlobClient cloudBlobClient = cloudStorageAccount.createCloudBlobClient();
    CloudBlobContainer container = cloudBlobClient.getContainerReference(containerName);
    container.createIfNotExists();
 
    return container;
}