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javajakarta-eehttpsessiongetattribute

Java HttpSession .getAttribute(String name)

I have a simple, short question but not found the answer anywhere. I created an HttpSession and want to get an attribute from it, for example a User object.

HttpSession session = request.getSession(true);
Object userObject = session.getAttribute("name");
if ((userObject != null) && (userObject instanceof User)) {
    User currentUser = (User) userObject;
    ...
}

The question is the following: .getAttribute function gets a String name as parameter - what is the name? From where do I know the name? Is it predefined somewhere? - then where to define another one?

Thank you!

Solution

  • Usually, you add attributes to the session yourself like so:

    User someObject = new User();
session.setAttribute("pickaName", someObject);

    Then you can get the session and pull off this attribute using that same name you used earlier like so:

    User sameObject = (User) session.getAttribute("pickaName");