If you’re already on EL 3.0 (Tomcat 8+, WildFly 8+, GlassFish 4+, Payara 4+, TomEE 7+, etc), which supports new operations on collection objects, you can use ${[…]} syntax to construct a list, and ${{…}} syntax to construct a set. <c:set var=”alphabet” value=”${[‘A’,’B’,’C’,’D’,’E’,’F’,’G’,’H’,’I’,’J’,’K’,’L’,’M’,’N’,’O’,’P’,’Q’,’R’,’S’,’T’,’U’,’V’,’W’,’X’,’Y’,’Z’]}” scope=”application” /> If you’re not on EL 3.0 yet, use the ${fn:split()} … Read more
I think it helps more if you see with your own eyes that it can actually be done entirely without scriptlets. Here’s a 1 on 1 rewrite with help of among others JSTL (just drop jstl-1.2.jar in /WEB-INF/lib) core and functions taglib: <%@ taglib uri=”http://java.sun.com/jsp/jstl/core” prefix=”c” %> <%@ taglib uri=”http://java.sun.com/jsp/jstl/functions” prefix=”fn” %> <html> <head> <title>My … Read more
You need to use declaration syntax (<%! … %>): <%! public String doSomething(String param) { // } %> <% String test = doSomething(“test”); %>
JSTL variables are actually attributes, and by default are scoped at the page context level. As a result, if you need to access a JSTL variable value in a scriptlet, you can do so by calling the getAttribute() method on the appropriately scoped object (usually pageContext and request). resp = resp + (String)pageContext.getAttribute(“test”); Full code … Read more
Scripts are raw java embedded in the page code, and if you declare variables in your scripts, then they become local variables embedded in the page. In contrast, JSTL works entirely with scoped attributes, either at page, request or session scope. You need to rework your scriptlet to fish test out as an attribute: <c:set … Read more
The use of scriptlets (those <% %> things) in JSP is indeed highly discouraged since the birth of taglibs (like JSTL) and EL (Expression Language, those ${} things) way back in 2001. The major disadvantages of scriptlets are: Reusability: you can’t reuse scriptlets. Replaceability: you can’t make scriptlets abstract. OO-ability: you can’t make use of … Read more