How to access servlet objects from OA page controller class

Hi everybody!
I need to put some value into servlet attribute in OA page controller class to read it from ordinary servlet later.
How can i do it? Is it possible to get HttpServletRequest and HttpServletResponse objects from page controller?
Thank you.

I have a servlet which receives uploaded files with special attributes (something like tags for file) using POST request.
This attributes created when user open page in standard OAF page via page controller.
On client side I have an applet which uploads user selected file to my servlet and passes this file attributes.
Now this attributes passes as plain text. I want to encrypt this attributes to hide attribute details from user. To do this I need to share some information between OAF page and my servlet.
I know that OAF supports URL encryption, but to decrypt it I should use standard pageContext object.
But in ordinary servlet I can't use it.

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How to access servlet objects from OA page controller class

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