Is it possible to upload file (images) to BlobStore programmatically without the reference to Forms (jsp.... ) ?
I've searched all related topics to my problem but no item deals exactly with what i need.
I will be very grateful if you help me.
Not anymore: there used to be a Files API, but it's now deprecated.
You should use Google Cloud Storage instead, which has all features of blobstore and also has Client Library allowing you to programmatically store data.