java 在 JSTL 标签中检索 cookie 和数组值
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Retrieving cookie and array values in JSTL tags
提问by Akash
While retrieving cookies I need to use:
在检索 cookie 时，我需要使用：
<c:forEach items="${cookie}" var="currentCookie">
${currentCookie.value.name} </br>
</c:forEach>
But, while using custom arrays, why we need to skip the .value function?
但是，在使用自定义数组时，为什么我们需要跳过 .value 函数？
<c:forEach items="${myList}" var="myList">
${myList.name} </br>
</c:forEach>
Cookie contains a .getValue function() which returns the content of the cookie in string format, so how does using currentCookie.value.name work?
Cookie 包含一个 .getValue 函数（），它以字符串格式返回 cookie 的内容，那么使用 currentCookie.value.name 是如何工作的呢？
回答by BalusC
The ${cookie}points to a Map<String, Cookie>with the cookie name as map key and the Cookieobject as map value. Every iteration over a Mapin <c:forEach>gives you a Map.Entryback which in turn has getKey()and getValue()methods. Your confusion is that the Cookieobject has in turn alsoa getValue()method.
该${cookie}指向Map<String, Cookie>与cookie的名称作为地图键和Cookie对象映射值。每次迭代通过Map在<c:forEach>给你一个Map.Entry回这反过来又getKey()和getValue()方法。您的困惑是该Cookie对象反过来也有一个getValue()方法。
<c:forEach items="${cookie}" var="currentCookie">
Cookie name as map entry key: ${currentCookie.key}<br/>
Cookie object as map entry value: ${currentCookie.value}<br/>
Name property of Cookie object: ${currentCookie.value.name}<br/>
Value property of Cookie object: ${currentCookie.value.value}<br/>
</c:forEach>
It's a Map<String, Cookie>because it allows you easy direct access to cookie value when you already know the name beforehand. The below example assumes it to be cookieName:
这是Map<String, Cookie>因为当您事先知道名称时，它允许您轻松直接访问 cookie 值。下面的例子假设它是cookieName：
${cookie.cookieName.value}
Your list example is by the way invalid. The varshould not refer the same name as the list itself.
顺便说一下，您的列表示例无效。本var不应该是指相同的名称列表本身。
