I believe, the JSP page can grab the "MyDataBean" off the session
object w/o using the <usebean>
Hien
-----Original Message-----
From: Taggart Gorman [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 06, 1999 2:26 PM
To: [EMAIL PROTECTED]
Subject: Re: Model 2. How to implement?
JavaGuy writes:
> I have a simple question:
> How does one implement "Model 2" as described in the jsp specs?
> I would like a servlet to get the replies from the user and
> use JSP to display the results. There are no examples in the
> documentation or the example code... How does the servlet call
> the JSP page?
The servlet doesn't "call" the JSP, it either redirects or forwards to it.
One method would be to use HttpServletResponse.sendRedirect(String) from
within the servlet to tell the client browser to go to the JSP. However,
this causes an extra round trip from the client to the server.
The preferred method (IMHO) in the 0.92 spec is to use
RequestDispatcher.forward(String) to have the web server "automagically"
forward input from a second URL within the same connection. You can get a
RequestDispatcher by calling ServletContext.getRequestDispatcher(). Note
that this is a new addition to the servlet spec (2.1 I think), and is not
supported by all JSP implementations. I know for a fact that it is support
in JRun 2.3. Check the JSP FAQ for more information on JSP implementations.
And I'll jump the gun and tell you how to pass objects from a servlet to a
JSP, just in case.
In the servlet, create the object you want to access in the JSP. The
object should be "JavaBean-like" and use get/set methods to access data.
Then stuff the object into the current HttpSession, like so:
MyDataBean bean = new MyDataBean ();
HttpSession sess = req.getSession(true);
sess.putValue("databean", MyDataBean );
Then in the JSP you forward() to, use the following JSP tags to get the
bean and access it:
<usebean name=databean type=com.tradiant.MyDataBean>
</usebean>
<display property=databean:myData>
And that's it. (Note that the name of the object you put into the session
and the name in the <usebean> tag are the same - that's the trick to passing
objects between servlets and JSPs.)
Hope this helps.
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