Servlet/JSP-08 EL表达式

EL - Expression Language

一. 基本语法

　　EL表达式以 ${} 的形式访问变量的值

　　1. "." 和 "[]" 运算符

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
    <%
        String token = "push";
    %>
    age: ${sessionScope.customer[age]} }
    key: ${param["user.key"]} }
    token: ${requestScope[token]}
</body>
</html>

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