在JSP中将枚举值作为标签属性传递

我有一个自定义JSP标签,它使用一个枚举的参数.这种方法是使用需要这个枚举的其他类的结果.关键是我没有线索如何在EL中分配枚举值：

<mytaglib:mytag enumParam="${now what do I type here?}" />

到目前为止我发现的唯一的解决方法是使枚举是一个整数,并将其转换为所需的值：

<mytaglib:mytag enumParam="3" />

我相信一定要有更好的办法.请帮忙.

EL允许使用枚举！

There are three ways to set a tag attribute value using either an rvalue or lvalue expression:
[..]

With text only:

<some:tag value=”sometext”/>

This expression is called a literal expression. In this case, the attribute’s String value is coerced to the attribute’s expected type. Literal value expressions have special syntax rules. See Literal Expressions for more information. When a tag attribute has an enum type, the expression that the attribute uses must be a literal expression. For example, the tag attribute can use the expression “hearts” to mean Suit.hearts. The literal is coerced to Suit and the attribute gets the value Suit.hearts.

http://download.oracle.com/javaee/5/tutorial/doc/bnahq.html

枚举：

public Enum Color{ 
   RED, BLUE, GREEN 
}

JSP / Tag文件

<mytaglib:mytag enumParam="${'RED'}" />

测试与Tomcat 7.0.22以及Jetty 6.1.26.