How to Use Session Jsp in java

<%@ page errorPage="errorpage.jsp" %>






<%
Integer count = (Integer)session.getAttribute("COUNT");
// If COUNT is not found, create it and add it to the session
if ( count == null ) {

count = new Integer(1);
session.setAttribute("COUNT", count);
}
else {
count = new Integer(count.intValue() + 1);
session.setAttribute("COUNT", count);
}
out.println("Hello you have visited this site: "
+ count + " times.");
%>