当属性名称本身是一个动态变量时，如何获取bean属性的值 [英] How to get value of bean property when property name itself is a dynamic variable

问题描述

我正在尝试编写一个自定义JSPX标记，该标记从给定列表中的每个对象读取给定bean属性的值，并将该属性的名称作为JSP属性传递给该标记.标签看起来像这样:

I'm trying to write a custom JSPX tag that reads the value of a given bean property from each object in a given list, with the name of that property passed to the tag as a JSP attribute. The tag would look something like this:

<jsp:root xmlns:c="http://java.sun.com/jsp/jstl/core"
        xmlns:jsp="http://java.sun.com/JSP/Page"
        version="2.0">
    <jsp:output omit-xml-declaration="yes"/>

    <jsp:directive.attribute name="items" type="java.lang.Iterable"
        required="true" description="The items whose properties are to be read"
        rtexprvalue="true"/>
    <jsp:directive.attribute name="propertyName" type="java.lang.String"
        required="true" description="The name of the bean property to read"
        rtexprvalue="true"/>

    <c:forEach items="${items}" var="item">
        <!-- This is the bit that doesn't work -->
        <jsp:getProperty name="item" property="${propertyName}" />
    </c:forEach>

</jsp:root>

问题在于jsp:getProperty标记的property属性似乎不接受表达式，而仅接受文字值.这样就可以了，但是对我没有用(因为直到运行时我才知道属性名称):

The problem is that the property attribute of the jsp:getProperty tag doesn't seem to accept an expression, only a literal value. So this would work, but is no use to me (as I don't know the property name until runtime):

<jsp:getProperty name="item" property="firstName" />

我得到的错误是:

org.apache.jasper.JasperException: org.apache.jasper.JasperException:
PWC6054: Cannot find any information on property '${propertyName}' in
a bean of type 'com.example.FooBar'

感谢您的帮助.

推荐答案

如果要使用动态属性名称，请使用大括号表示法.

If you want to use dynamic property names, use the brace notation.

<c:forEach items="${items}" var="item">
    ${item[propertyName]}
</c:forEach>

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