Java 您如何从 JSF 2.0 Facelets 模板调用 List.size()？
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How do you call List.size() from a JSF 2.0 Facelets Template?
提问by jsight
What is the syntax for calling list.size() in a JSF 2.0 Facelets template (eg, using an h:outputText element)?
在 JSF 2.0 Facelets 模板中调用 list.size() 的语法是什么（例如，使用 h:outputText 元素）？
采纳答案by harto
How about this:
这个怎么样：
<h:outputText value="#{fn:length(someBean.someList)}" />
You'll need to reference the functionstaglib in your JSF page (URI: http://java.sun.com/jsp/jstl/functions).
您需要functions在 JSF 页面（URI: http://java.sun.com/jsp/jstl/functions）中引用taglib 。
回答by Jim Barrows
It's not a problem with JSF 2.0 exactly. The JSF spec still requires a class that conforms to the bean spec. The collection classes don't do that with the .size()method. It would still have to be .getSize().
Given the need for a "standard" way to access the class values, we're not getting around that in JSF any time soon. Somebody needs to fix the collection classes.
这完全不是 JSF 2.0 的问题。JSF 规范仍然需要一个符合 bean 规范的类。集合类不使用该.size()方法执行此操作。它仍然必须是.getSize()。鉴于需要一种“标准”方式来访问类值，我们不会很快在 JSF 中解决这个问题。有人需要修复集合类。
回答by André
Just try #{myBean.myList.size()}
你试一试 #{myBean.myList.size()}
回答by Benny Neugebauer
Note:The exact namespace for "fn" is added like this:
注意：“fn”的确切命名空间添加如下：
<html xmlns="http://www.w3.org/1999/xhtml"
...
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
