使用变量值作为jstl中的参数调用另一个变量 [英] calling another variable using a variable value as parameter in jstl

问题描述

逻辑在某种程度上是这样的：

the logic is somehow like this:

<c:set var="vehicle" value="car">
<c:set var="car" value="ferrari">

因为 $ {vehicle} =car的价值这也是变量的名称，其值为ferrari我使用 $ {'$ {vehicle}'} 间接访问它但它没有'似乎工作。有人可以帮我弄这个吗。谢谢

since the value of ${vehicle} = "car" which is also the name of the variable with the value of "ferrari" i access it indirectly using ${'${vehicle}'} but it doesn't seem to work. Can someone help me with this. thanks

推荐答案

这种东西通常不适用于java（没有 eval 声明）。但是，在这种情况下，变量绑定到请求上下文，所以我猜你可以像这样访问它（假设变量被分配给请求范围）：

This kind of things doesn't usually work in java (there's no eval statement). In this case however, the variables are bound to the request context, so I guess you could access it something like this (assuming the variables were assigned to request scope):

${requestScope[vehicle]}

但我不能验证，因为我还没有编写任何JSP代码大约3年。

But I can't verify that, because I have not written any JSP code for about 3 years.

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