我可以使用EL从JSP访问枚举类的值吗？

问题描述

我有一个枚举类 USState 。我想在JSP中遍历州。

I have an enum class USState. I would like to iterate through the states in a JSP.

是否可以访问 USState s的列表没有首先设置这样的列表作为属性？似乎一个静态的枚举应该永远是可用的，但是我不知道该怎么做。

Is it possible to access a list of USStates without first setting such a list as an attribute? It seems that something as static as an enum should always be available, but I can't figure out how to do it.

这是我正在寻找的：除了工作）

Here's what I'm looking for: (except working)

<c:forEach var="state" items="${USState.values}" >
    <option value="${state}">${state}</option>
</c:forEach>

推荐答案

你必须在你的背景上创建一个列表代码并将其作为模型参数传递。最好在一个 ServletContextListener （由BalusC建议），并将它放在 ServletContext （即应用范围）中： p>

You will have to create a list somewhere on your backing code and pass it as a model parameter. Preferably in an ServletContextListener (as advised by BalusC) and put it in the ServletContext (i.e. application scope):

servletContext.setAttribute("statesList", YourEnum.values());

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