How to work with Grails Http sessions

Question

I'm new to Grails and I'm struggling with sessions..

In a controller, how do I check is the user has a valid session? In Java/Spring MVC, it's simple request.getSession(), so what's the convention in Grails?

How do I add/get values from the session?

Thanks,

Solution 1

Grails uses the same servlet API as Java EE, though it provides a few extra convenience methods. Within a Grails controller, taglib or GSP there are implicit variables request and session that refer to the current HTTPServletRequest and HttpSession.

Here's an example of how Grails makes it slightly more convenient to work with these objects:

Java

Object fooAttr = session.getAttribute("foo");

Grails

def fooAttr = session["foo"]

Solution 2

you can work with the "session" object

grails session

Solution 3

After the user logs in, set the value(username) in the session. For example, your domain class is User.groovy. So in your login method in controller:, you can do:

def login()
{
    def u = new User()
    u.properties[
            'login',
            'password',
            ] = params        
    if(u.save())
    session.user = u
}

After that, whenever you want to check if the session is still on, just do

if(session.user != null)
//your code