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Posted to users@tomcat.apache.org by "Samson, Lyndon [IT]" <ly...@ssmb.com> on 2001/06/06 13:27:51 UTC

forward() question

I have some code that looks something like this;


            RequestDispatcher rd =
_req.getRequestDispatcher("/invalid.jsp");
            try {
                rd.forward(_req, _resp);

            } catch ( ServletException e ) {
            } catch ( java.io.IOException e ) {
            }

The question is does control ever continue after the forward() method call?
It would seem sensible that it didn't 
if you viewed forward as, I no longer wan't this page, but another one
instead. 

My problem is that the above code is in a bean, which does an isValid user
check and forwards to a page if they are not. After the bean access I have
regular pages which are only mean to be displayed if the user is valid.

Like this;

<jsp:useBean id="userChk" class="package.UserValid"/>
<jsp:setProperty name="userChk" property="UserName" value="auser"/>
<jsp:setProperty name="userChk" property="UserPass" value="apass"/>
<% userChk.setPageInfo(request, response); %>
<jsp:getProperty name="userChk" property="IsValid"/>

<body bgcolor="#7080D0" link="#00FF00" alink="#000000" vlink="#00FFFF">
  <font size="+1" color="#D0F0F0">
  <p>
    Show this if user is valid
  </p>
</body>

What actually happens is the invalid page is shown, with the additional
"Show if user is valid" html appended to the end.

What can I do? I'd really like the forward to actually forward, not act like
include.

Re: forward() question

Posted by Wyn Easton <wy...@yahoo.com>.

Yes, you do return from the rd.forward() method call.
I always put a "return;" after such a call in my
servlets.  Since your forward is done in the bean
try something like this:
<% userChk.setPageInfo(request, response);
   if(!userChk.IsValid())
     return;
%>

If you are interested, you can look at the Java code
that is generated by your JSPs in Tomcat's "work"
directory.  That might give you a better idea of how
the generated servlet looks.

--- "Samson, Lyndon [IT]" <ly...@ssmb.com>
wrote:
> I have some code that looks something like this;
> 
> 
>             RequestDispatcher rd =
> _req.getRequestDispatcher("/invalid.jsp");
>             try {
>                 rd.forward(_req, _resp);
> 
>             } catch ( ServletException e ) {
>             } catch ( java.io.IOException e ) {
>             }
> 
> The question is does control ever continue after the
> forward() method call?
> It would seem sensible that it didn't 
> if you viewed forward as, I no longer wan't this
> page, but another one
> instead. 
> 
> My problem is that the above code is in a bean,
> which does an isValid user
> check and forwards to a page if they are not. After
> the bean access I have
> regular pages which are only mean to be displayed if
> the user is valid.
> 
> Like this;
> 
> <jsp:useBean id="userChk"
> class="package.UserValid"/>
> <jsp:setProperty name="userChk" property="UserName"
> value="auser"/>
> <jsp:setProperty name="userChk" property="UserPass"
> value="apass"/>
> <% userChk.setPageInfo(request, response); %>
> <jsp:getProperty name="userChk" property="IsValid"/>
> 
> <body bgcolor="#7080D0" link="#00FF00"
> alink="#000000" vlink="#00FFFF">
>   <font size="+1" color="#D0F0F0">
>   <p>
>     Show this if user is valid
>   </p>
> </body>
> 
> What actually happens is the invalid page is shown,
> with the additional
> "Show if user is valid" html appended to the end.
> 
> What can I do? I'd really like the forward to
> actually forward, not act like
> include.
> 


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