I am creating a small project (CRUD) for my college in JSP. The problem is that a user can create,read,update and delete items only after he gets logged in. I have created all things and its working all fine. But how can I check that this is a logged user or not in my every jsp page.
If it is not a logged one then it should be redirected to index.jsp.
I know I have to session variables but don't know how to use it? Please also provide me the best coding practice to write this code once and include in all subsequent files.