foreverke01 发表于 2013-2-6 10:59:00

初识EL

EL的历史不说了,具体情况也不说了,网上很多资料介绍下怎么使用EL语言:
首先,el是jstl的一套标签中 的一部分,与struts框架无关,在struts下开发,是为了方便在struts下测试EL:
EL的格式:
${} 在{}里直接写上key的值,就可以找到对应的value:
例如:
elAction.java:
package com.keith.el;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;public class ElAction extends Action {@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {request.setAttribute("he", "hello EL ");return mapping.findForward("elTest");}} struts-config.xml:
<action-mappings>      <action path="/elTest"type="com.keith.el.ElAction"><forward name="elTest" path="/elTest.jsp"></forward></action></action-mappings> el.jsp:
<body><h2>EL Test</h2>EL输出:${he }</body>
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