Re: Eliminate conditions in JSP

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 15 Nov 2007 21:03:54 -0500

Message-ID:

<473cfa89$0$90270$14726298@news.sunsite.dk>

teser3@hotmail.com wrote:

On Nov 15, 7:47 pm, Arne VajhHj <a...@vajhoej.dk> wrote:

tes...@hotmail.com wrote:

I have a Servlet that checks for information and if there is an issue
it forwards the message to presentation page (JSP). Now I want to stop
using conditions in scriptlets in the JSP. Please advise how I can do
it in this situation in my Tomcat 4.1.27 container:
Servlet that forwards to JSP:
...
String gotopage = "";
if(mydata == 1)
{
     gotopage = /"pager.jsp?mymessage=err";
}
else if(mydata == 34
{
   gotopage = /"pager.jsp?mymessage=duper";
}
else
{
    gotopage = /"pager.jsp?mymessage=proc";
}
RequestDispatcher dispatcher =
  getServletContext().getRequestDispatcher(gotopage);
dispatcher.forward(request, response);
...
JSP
<%
String mymessage = request.getParameter("mymessage")
if(mymessage.equals("err"))
{
     out.println("Error on the page");
}
else if(mymessage.equals("dup"))
{
     out.println("Duplicate issue.");
}
else if(mymessage.equals("proc"))
{
     out.println("Process message issue");
}
%>

Why not have the servlet store the long text in the request object
and have the JSP simply display it with a <%=whatever%> ?

Thanks, I guess I dont know how I would do that?
I have showed data in JSP in the past as <%=whatever%> using a
JavaBean but not
sure how I would do that using Request object. Can you provide any
example?

if(mydata == 1)
{
      val = "Error on the page";
}
else if(mydata == 34
{
     val = "Duplicate issue.";
}
else
{
      val = "Process message issue";
}
request.setAttribute("whatever", val);
RequestDispatcher dispatcher =
   getServletContext().getRequestDispatcher("/pager.jsp");
dispatcher.forward(request, response);

Arne