Inserting a return command into a jsp

[David Miranda]

Hello all,

Is there anyway to pass a return statement back to a jsp?

(Reason why I ask is because sometimes my calling jsp will call a bean or servlet that will need to do response.sendRedirect() and do not want the calling jsp to continue processing...instead I want the calling jsp to just immediately redirect to avoid response already committed exceptions)

For instance,

(in jsp1)
<%
...
RequestDispathcer rd = request.getRequestDispatcher("jsp2.jsp");
rd.include(request,response);
...
%>
 
 
(in jsp2)
<%
if (true) {
return;
}
%>

To get the same effect as this at runtime:

(at runtime in jsp1)
<%
...
if (true) {
return;
}
...
%>

Edit: Just to clarify a little bit. The reason why I do not want to handle the if/then return statement in the calling jsp is because I do not want others to have to write the if/then return logic into their calling jsps should they want to implement my bean/servlet.

Thanks!
[ December 15, 2005: Message edited by: David Miranda ]

[Ben Souther]

Moved to JSP forum

[Stefan Evans]

>Is there anyway to pass a return statement back to a jsp?
No.
You can only "return" down one level in the call stack.
I suppose you could throw an exception to have it drop down multiple levels, but using exceptions to control program flow is bad karma.

You could possibly pass the data via a request attribute.
ie

 
//in jsp2  
request.setAttribute("IveHandledTheResponse", "true");
 
//and in jsp1
<jsp:inclue page="jsp2.jsp" />
<%
  if (request.getAttribute("IveHandledTheResponse") != null){
    return;
  }
%> 

Does that help?

[Bear Bibeault]

Or you could move such processing out of the JSPs altogether and make any forwarding and redirection decisions in a serlvet controller prior to even getting close to a JSP.

[David Miranda]

Thanks for your input, Stefan and Bear!