Updating value of a variable on a JSP page

Question

Hya!
I am very new to JSP and I am struggling to make a homepage work according to the specifications my group has decided to use. I would be grateful if you could help me in this, as it's really urgent. Let me describe the issue:
My web site contains a set of six JavaBeans that keep information that is more a less unchangeable (it works as a table). The information that is kept by the JavaBeans can be viewed by the user once he/she makes a selection. This information then will help the user in deciding to buy a certain number of tickets. That's the point where the problem appears.
I need the variable 'totalTickets' to vary depending on each user's purchase. I've set the original value to 100 on JavaScript but that means that in each visit this number would be reset to 100 again, as JavaScript is a client-side technology. On the other hand if I set this variable in JSP the same problem would happen. Would there be a way to allow this variable to be reset after each visit? What would I need to make this possible?
I am looking forward to hearing from all of you.
Yours sincerely,
Saulo

Answer 1

Is this correct,
1. User login to the system for the first time. Then TotalTicket count will be set to 100.
2. User purchase a ticket and the count will become one less (i.e 99).
3. For every purchase of a ticket, count will be reduced by one.
4. User logs out. Now let us say, the count is 95. (i.e user has purchased 5 tickets).
5. Now again user login to the syatem. The ticket count must be initialized to 95.
and so on.
If this is what you want, then you must either store the TicketCount in the database or atleast in the application context.
int totalTicket=100;
Hashtable ticketCounterMap=(Hashtable)application.getAttribute("ticketCounterMap")
if(ticketCounterMap == null)
     ticketCounterMap = new Hashtable();
     ticketCounterMap.add("login_user_name",new Integer(totalTicket));
     application.setAttribute("ticketCounterMap");
else
     totalTicket = ((Integer)ticketCounterMap.get("login_user_name")).intValue();
and in case of purchasings.
if(purchase.....)
     totalTicket--;
     ticketCounterMap.add("login_user_name",new Integer(totalTicket));
     application.setAttribute("ticketCounterMap");
Hope this helps.
Sudha
P.S:- There may be errors in the above code. This is just to give you an idea.