How to set a parameter scope?

Question

Hi,
I am very new to java and having a problem with the request parameters. In my URL i have a request parameter
http://localhost:8080/for/admin.jsp?companyID="12345" .
The problem i have is when i click on a link in admin.jsp and navigate to another JSP say account.jsp .If i want to navigate back to admin.jsp page the companyID parameter is not present anymore in my URL(now th url is http://localhost:8080/for/admin.jsp) and i get an exception. Please let me know how can i retain it in the URL by changing the scope of the paramter so that it is visible when i navigate back?
I really appreciate the help.
Thanks

Answer 1

Keep passing the url in all requests.
For this to work, you will have to rewrite all urls in the jsps.
For example in admin.jsp, the account link should be rewritten as
<a href = "http://localhost:8080/for/account.jsp?companyID=<%=request.getParameter("companyID")%>">account</a>
and then in account.jsp, the admin link should be rewritten as
<a href = "http://localhost:8080/for/admin.jsp?companyID=<%=request.getParameter("companyID")%>">admin</a>The other option is to store the companyId in session scope.
So in admin.jsp, on first request
<%
   if(request.getParameter("companyID") != null){
         session.setAttribute("companyID",request.getParameter("companyID") );
%>and then later whenever you need access to the companyID, use
String companyID = (String)session.getAttribute("companyID");ram.