JSP2.0EL表达式示例
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servlet2.4 对应 JSP2.0 规范已经完全支持EL表达式，即使不用jstl也可以从session、request里取出对象属性了
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ page import="java.util.*" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><%Map requestMap=new HashMap();requestMap.put("a","a");Map sessionMap=new HashMap();sessionMap.put("b",requestMap);sessionMap.put("c",null);request.setAttribute("requestMapData",requestMap);session.setAttribute("sessionMapData",sessionMap);%><font color="red">${requestMapData.a}</font><br><font color="black">${sessionMapData.b.a}</font><br><font color="blue">${sessionMapData.c.a}</font></body></html>?