[SOLVED] How do I check whether the user is logged in on every page in Struts 1?

How do I check whether the user is logged in on every page in Struts 1?

I am using the HTTP session object to store the logged in user id in signUpAction.java:

HttpSession session = request.getSession();
if(login>0&&candy>0){                
    session.setAttribute("username", val.getUsername());
    result = "success";    
}

then I forward the user to a JSP page corresponding to his/her id.

User name is <bean:write name="signUp" property="username"/>

The problem is that, when the user clicks the back button, he/she logs back out (without clicking any logout button). I want a session to be maintained until the user clicks on the logout button. And how do I check whether the user is logged in on every page?

I am using Struts 1.3 and I'm new to it. Please help me. I'm trying to develop a Job Portal web app as a project.

Solution

Here is how I did it. In my validateAction class file

HttpSession session = request.getSession();
session.setAttribute("username", val.getUsername());

After that on every JSP page i wrote

<c:choose>
        <c:when test="${not empty sessionScope.username}">
            // all the codes goes here
        </c:when>
        <c:otherwise>
            <h1>Please Login First.</h1>
        </c:otherwise>
</c:choose>

And in the master page I included

<body onload="window.history.forward(1);">

so even when the user clicks the back button the browser won't load the last cached page.

and when the user clicks the logout button, I call my invalidateAction class file

HttpSession session = request.getSession();
session.removeAttribute("username");