双嵌套EL变量? [英] Doubly nested EL variables?

问题描述

我正在使用Spring MVC作为控制器，而JSP是我的表示层.

I'm using Spring MVC for my controller, and JSPs are my presentation layer.

在我的Spring控制器中，我有:

Inside my Spring controller, I have:

model.put("issues", dataManager.getIssues());
model.put("functions", dataManager.getFunctions());

所以现在在我的JSP中，我可以访问

So now inside my JSP, I have access to

${requestScope['issues']}
${requestScope['functions']}

一切都很好.但是为了使我的代码可扩展，我想将变量名称issues和functions存储在数据库中，然后可以通过正在循环的configs对象上的属性对其进行访问.因此，我最终希望得到的是以下内容:

That's all well and good. But in order for my code to be extensible, I would like to store the variable name issues and functions inside the database, which will then be accessible through a property on a configs object that's being looped over. So what I'd like to end up with is something like the following:

<c:forEach items="${configs}" var="cfg">
    <c:if test="${cfg.configType == 'select'}">
        <th>${cfg.header}</th>
        <td><myTagLib:select values="${requestScope['${cfg.selectorName}']}" /></td>
    </c:if>
</c:forEach>

在此示例中，${cfg.selectorName}将容纳issues或functions.

Where ${cfg.selectorName} will hold either issues or functions in this example.

推荐答案

您已经关闭.您只需删除嵌套的${}，因为这是无效的语法.

You're close. You only need to remove the nested ${} since that's invalid syntax.

<myTagLib:select values="${requestScope[cfg.selectorName]}" />

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