EL隐含对象：

1、与范围有关的隐含对象

applicationScope

sessionScope

requestScope

pageScope

2、与输入有关的隐含对象

param

paramValues

3、其它隐含对象

cookie

header

headerValues

initParam

pageContext

使用方法：

<%@page import="java.util.ArrayList"%><%@page import="java.util.List"%><%@page import="com.atguigu.javaweb.Customer"%><%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
    	
    	${param.score > 60 ? "及格" : "不及格" }	
		<% 		List
    
      names = new ArrayList
     
      ();		names.add("abc");		request.setAttribute("names", names);	%>	
      	names is empty: ${empty requestScope.names }	
      
		
      	pageContext: pageContext 即为 PageContext 类型, 但只能读取属性就可以一直的 . 下去。 	
      
	contextPath: ${pageContext.request.contextPath }		
      
	sessionId: ${pageContext.session.id }		
      
	sessionAttributeNames: ${pageContext.session.attributeNames }		
      
			initParam: ${initParam.initName }	
      
		Accept-Language: ${header["Accept-Language"] }	
      
	JSESSIONID: ${cookie.JSESSIONID.name } -- ${cookie.JSESSIONID.value }	
      
	
      	score: ${param.score }	<%-- 	<%= request.getParameter("score") %>	--%>	
      
	names: ${paramValues.name[0].class.name }	<%-- 	<%= 		request.getParameterValues("name")[0].getClass().getName()	%>	--%>	
      
		
      	time: ${applicationScope.time.time }	<%-- 	<%= application.getAttribute("time") %>	--%>	
      
		
      	score: ${param.score + 11}	
      
	score: <%= request.getParameter("score") + 11 %>	
      
		
      	<% 		Customer cust2 = new Customer();		cust2.setAge(28);		request.setAttribute("customer", cust2);	%>		age: ${customer.age } 	
      
	
      	age: ${sessionScope.customer["age"] }		<%-- 		Customer customer = (Customer)session.getAttribute("customer");		out.print(customer.getAge());	--%>		<% 		Customer customer = new Customer();		customer.setName("com.qimeng");				session.setAttribute("com.qimeng", customer);	%>		
      
	
      	name: ${sessionScope["com.atguigu.customer"].name }