How to use variable defined in a scriptlet in the same jsp page

Question

I have a jsp page namely User_Ref.jsp whcih has a datepicker .When I click on submit on that page ,it is redirected to another jsp page namely ref_time_current.jsp.In this jsp page I have used a scriptlet to hold the value which was selected by user from the calendar ie datepicker. The scriptlet is

<%
  Ref_log_current obj = new Ref_log_current();
  String str= request.getParameter("datepicker");
 ref.refarray_vac1(str);
%>

Now I want to use this str variable defined in scriptlet in this way in same jsp page- <c:out value="${ref.refarray_vac1(str)}"></c:out>

But When I execute this,refarray_vac1(String Date) method which return list is showing an empty list.I think I'm using the str variable in wrong way.Please correct me.

Answer 1

JSTL has only access to scoped variable, not directly to scriplet ones. But you can easily create a page variable that way :

<%
  Ref_log_current obj = new Ref_log_current();
  String str= request.getParameter("datepicker");
  pageContext.setAttribute("str", str); // store str in page scope under name str
%>

You can then safely access ${str} in the JSP file.

Answer 2

In JSTL is not possible to use scriptlet variable in expression. Also you don't need to use scriptlet.

You need to import the bean class you create in JSP

<%@ page import="com.beans.Ref_log_current" %>

You can access parameters like this

<jsp:useBean id="ref" class="com.beans.Ref_log_current" scope="page"/>
<c:out value="${ref.refarray_vac1(param.datepicker)}"/>