Wow!
Poetry is what this was.
Talk about leaving nothing to add!
Someone please add this to the FAQ for future generations.
</kissup>
dave.
"Craig R. McClanahan" wrote:
> Javier Gutiérrez wrote:
>
> > Hi, How can I pass a reference to a JavaBean from a
> > servlet to a JSP page? Thanks.
>
> There are actually three different ways to do it, depending on how long
> the reference should last, and which JSP pages (and servlets, for that
> matter) should be able to see it. In each of the cases, assume that
> "myBean" is a reference to the bean you want to send, and that "theBean"
> is the key I'm going to use to store the bean under (from the servlet
> perspective), and use as the identity of the bean in the JSP page.
>
> These techniques are portable to any environment compliant with the
> servlet API 2.1 and JSP 1.0 specifications. In each case, the passing
> works from servlet->JSP, servlet->servlet, JSP->JSP, or JSP->servlet
> transitions.
>
> (1) Request Lifetime
>
> Use this technique to pass beans that are relevant to this particular
> request to a bean you are calling through a request dispatcher (using
> either "include" or "forward"). This bean will disappear after
> processing this request has been completed.
>
> SERVLET:
> request.setAttribute("theBean", myBean);
> RequestDispatcher rd =
> getServletContext().getRequestDispatcher('/thepage.jsp");
> rd.forward(request, response);
>
> JSP PAGE:
> <jsp:useBean id="theBean" scope="request" class="....." />
>
> (2) Session Lifetime
>
> Use this technique to pass beans that are relevant to a particular
> session (such as in individual user login) over a number of requests.
> This bean will disappear when the session is invalidated or it times
> out, or when you remove it.
>
> SERVLET:
> HttpSession session = request.getSession(true);
> session.putValue("theBean", myBean);
> /* You can do a request dispatcher here,
> or just let the bean be visible on the
> next request */
>
> JSP PAGE:
> <jsp:useBean id="theBean" scope="session" class="..." />
>
> (3) Application LIfetime
>
> Use this technique to pass beans that are relevant to all servlets and
> JSP pages in a particular app, for all users. For example, I use this
> to make a JDBC connection pool object available to the various servlets
> and JSP pages in my apps. This bean will disappear when the servlet
> engine is shut down, or when you remove it.
>
> SERVLET:
> getServletContext().setAttribute("theBean", myBean);
>
> JSP PAGE:
> <jsp:useBean id="theBean" scope="application" class="..." />
>
> Craig McClanahan
>
> ===========================================================================
> To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
> of the message "signoff JSP-INTEREST". For general help, send email to
> [EMAIL PROTECTED] and include in the body of the message "help".
--
David Mossakowski [EMAIL PROTECTED]
http://www.dwdog.com/styk 212.310.7275
"I don't sit idly by, I'm planning a big surprise"
F U G A Z I
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JSP-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
