jsp代码，在request域中存储的key中包含了特殊字符，怎么取出对应key的值
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>.运算符与[]运算符</title>
</head>
<body>
<%
// 域对象存储的key中包含特殊字符
request.setAttribute("a.a.a", "aaaValue");
request.setAttribute("b-b-b", "bbbValue");
request.setAttribute("c+c+c", "cccValue");
%>
${ a.a.a }<br/>
</body>
</html>
