Re: different clients using the same instance of a bean

[Michael Ni]

I copied some code I picked up from a website about application and session 
scope.  Can someone explain how setAttribute and getAttribute works?  what 
do the actual parameters do?  also when i use jsp useBean, i usually have a 
name, which is the name of my instance.  Where in servlet code does it use 
that name?

mike

ps pls look at code below



<jsp:useBean class="foo.Counter" scope="application" />

The servlet equivalent of the above useBean action is:

foo.Counter counter = 
(foo.Counter)getServletContext().getAttribute("counter");
if (counter == null) {
 counter = new foo.Counter();
 getServletContext().setAttribute("counter", counter);
}

----------------------------------------------------------------------

<jsp:useBean id="counter" class="foo.Counter" scope="session" />

The servlet equivalent of the above useBean action is:

HttpSession session = request.getSession(true);
foo.Counter counter = (foo.Counter)session.getValue("counter");
if (counter == null) {
 counter = new foo.Counter();
 session.putValue("counter", counter);
}
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