request.session.getAttribute

request.session.getAttribute() is a method in Java Servlet programming that allows a developer to retrieve an attribute value stored in the HttpSession object associated with the current user session. The method takes a String parameter representing the name of the attribute whose value needs to be retrieved. The method returns an Object that represents the value of the attribute or null if the attribute does not exist in the session.

For example, if a session attribute named "username" is stored in the HttpSession object, the attribute value can be retrieved using the following code:

String username = (String) request.getSession().getAttribute("username");

This code retrieves the value of the "username" attribute and casts it to a String type. If the attribute does not exist in the session, the variable "username" will be null.