jsp标签、 项目全路径引用${ctx}

<%@ taglib uri="/struts-tags" prefix="s"%>
<%@ taglib uri="http://Java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %> 
<c:set var="ctx" value="${pageContext.request.contextPath}"/>