Mike Engelhart wrote:
> Mark Hayes wrote:
> > Your views are valuable on this, thanks for sharing them. I was further
> > about the problem of passing information from the "logic" servlet to the JSP
> > file to which it forwards. If the servlet processes the business logic,
> > many times data will result from that processing which then should be used
> > in the presentation of the following JSP page. Since there is no way to
> > pass arguments when forwarding (right?), I assume you must use a session
> > variable. It seems that there are two cases; one case where the data being
> > passed is meant to remain in the session, and another case where the data is
> > only meant for the next page. In the latter case, the JSP page should
> > therefore delete the session data after it uses it. I was wondering if you
> > had run into this, and if a particular technique came in handy for you.
> >
> > thanks!
> > mark
>
> You most definitely pass arguments to JSP's from a servlet (if you're using
> the JSDK 2.1 or higher). That's what the RequestDispatcher allows you to
> do. You do something like the following within the servlets
> service/doGet/doPost method (of course you can stuff any object request with
> setAttribute()):
>
> String myVar = "Testing";
> request.setAttribute("myString", myVar);
> rd =getServletContext().getRequestDispatcher("yourjsp.jsp");
> rd.forward(request, response);
>
> Mike
>
Mike's answer is right on the money ... request attributes were added to meet the
exact need you are expressing. I would only like to add that this "argument"
shows up in your destination JSP page in a very convenient way -- as something you
can reference with a <jsp:useBean> action:
<jsp:useBean id="myString" type="java.lang.String" />
This also works for more complex object classes that have property getter methods
in the usual JavaBeans naming convention.
Craig McClanahan
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