jsp中 通过C标签获取系统信息，el表达式获取值

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ page import="com.unteck.tpc.framework.core.util.SecurityContextUtil,com.unteck.tpc.framework.web.model.admin.User" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <%-- <%@ taglib prefix="c" uri="/WEB-INF/tld/c.tld" %> --%><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><c:set var="CONTEXT_PATH" value="${pageContext.request.contextPath}" /><% User currentUser = SecurityContextUtil.getCurrentUser(); %><% if(null != currentUser) {%><c:set var="CURRENT_USER_ID" value="<%=currentUser.getId() %>" /><c:set var="CURRENT_USER_CODE" value="<%=currentUser.getUserCode() %>" /><c:set var="CURRENT_USER_NAME" value="<%=currentUser.getUserName() %>" /><c:set var="CURRENT_USER_ORGNAME" value="<%=currentUser.getOrgName() %>" /><% } %><script type="text/javascript">CONTEXT_PATH = '${pageContext.request.contextPath}';var value = '${CURRENT_USER_NAME}';alert(value);</script>