1. how to forward the value to JSP page
Put the value you got from database into request object in your Action class.
request.setAttribute("<key>","<value>");
2. how to manipulate the value passed onto JSP in a scrip let and check the check boxes accordingly.
get those values you previously stored in request object in JSP using same key which you used to store those values in action class.
check the value in JSP, decide whether check box should be checked or not.
hth,