Using session variables in a JEE Servlet (ADD variable/GET variable from session scope)

AddSessionVariableToServlet.md

Using session variables in a JEE (Servlet)

Open the session first !

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Open a session in a JEE Servlet (to do each time, in all Servlets that you want to access to Session variables)

// GET the current session from the request
HttpSession session 		= 	request.getSession();

Set/Add a variable to the current session

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In a JEE Servlet or JSP with <% %> tags, *** Session must be opened before! ***

// ADD a variable (User in this case) to a session
session.setAttribute("user", user);

Get a variable from the current session

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In a JEE Servlet or JSP with <% %> tags, , *** Session must be opened before! ***

// GET a variable (User in this case) from the  session 
User 		user		= 	(User) session.getAttribute("user");

Delete a variable from the current session

In a JEE Servlet or JSP with <% %> tags, , *** Session must be opened before! ***

// Delete a variable (User in this case) from the  session 
session.removeAttribute("user");

Destroy the current session

In a JEE Servlet or JSP with <% %> tags, , *** Session must be opened before! ***

// To destroy the current session
session.invalidate();

Enjoy !