How to figure out if users loggin in the system in JSP??

Hi, all
I am developing a website system which consist of
(Client Brower) <----> (JSP/Servlets) <--->(JavaBean)<----->(Database)
model, and the system is used to sell the DVD online, but I am just confused of how can I find out if the user is logged in or not?
Thanks to anyone who read and rely this.

use session variable or cookies to track the user if he / she is logged r not

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