How to get the variable set by c:set in Scriptlet ?

Question

Hello,
I set up some variables by <c:set> and struts tag <bean:size>, and the values should be considered as integers. How can I use the variables in math expression?
When I try to use the variables in scriptlets, I got compile errors in the getAttribute lines.
My code:
<bean:size id="listSize" name="list" /> <c:set var="pageSize" value="${20}" />
<c:set var="pageBegin" value="${param.pageBegin}" />
<%
int ls = (Integer)pageContext.getAttribute("listSize");
int ps = (Integer)pageContext.getAttribute("pageSize");
int totalPages = (int)Math.ceil((double)ls / ps);
%>

Answer 1

xiaoxuan_li wrote:Hello,
I set up some variables by <c:set> and struts tag <bean:size>, and the values should be considered as integers. How can I use the variables in math expression?
When I try to use the variables in scriptlets, I got compile errors in the getAttribute lines.
My code:
<bean:size id="listSize" name="list" />
<c:set var="pageSize" value="${20}" />
<c:set var="pageBegin" value="${param.pageBegin}" />
<%
bq. int ls = (Integer)pageContext.getAttribute("listSize"); \\ int ps = (Integer)pageContext.getAttribute("pageSize"); \\ int totalPages = (int)Math.ceil((double)ls / ps);
%>I finally find the errors, I change the getAttribute() lines to the following, and the program runs well, although I'm still curious of if there is a better way to get the value of totalPages by using JSTL tags, instead of scriptlets.
<%
bq. {color:#ff0000}Number {color}ls = {color:#ff0000}(Number){color}pageContext.getAttribute("listSize"); \\ {color:#ff0000}Number {color}ps = {color:#ff0000}(Number){color}pageContext.getAttribute("pageSize");
%>