c:foreach 仅返回一个空值
我正在使用 JSF 2，并且出于某些目的需要 c:foreach。但无论我的列表有多大，c:foreach 只循环一次，返回空值。我尝试了一切，我什至将 c:foreach 隔离在单独的 .xhtml 中，但它仍然给出相同的结果。如果您需要一些代码，请询问，但我想让 c:foreach 至少在单独的 .xhtml 中工作，并且我认为它也可以在我的代码中工作。
I'm using JSF 2 and I need c:foreach in some purposes. But no matter how big my list is, c:foreach loops only once, returning empty value. I tried everything, I even isolated c:foreach in separate .xhtml, but it still gives same result. If you need some piece of code, please ask, but I would like to make c:foreach work at least in separate .xhtml, and I supose that than it will work in my code, too.
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在网络浏览器中打开页面，右键单击并查看源代码。您在其中看到了普通的
如果您已经这样做了，那么它只能意味着您在没有预安装 JSTL 的服务器上运行 web 应用程序。成熟的 Java EE 应用服务器（例如 Glassfish 和 JBoss AS）已经捆绑了 JSTL，但简单的 Servlet 容器（例如 Tomcat 和 Jetty）却没有。您需要下载 JSTL 库并将其放入 web 应用程序的
/WEB-INF/lib中，甚至可能放入服务器自己的/lib文件夹中。另请参阅：
与具体内容无关的 下载链接和安装说明问题，您是否清楚
Open the page in the webbrowser, rightclick and View Source. You see the
<c:forEach>tag plain vanilla in there, right? It is not been parsed and executed at all? This is not right. You need to ensure that you have declared the JSTL core taglib in the XML namespace in order to get it to be parsed and executed by Facelets. The proper XML namespace declaration is the following:If you have already done it, then it can only mean that you're running the webapp on a server which does not have JSTL preinstalled. Full fledged Java EE application servers like Glassfish and JBoss AS already ship with JSTL bundled, but simple servlet containers like Tomcat and Jetty not. You'd need to download and put the JSTL library in webapp's
/WEB-INF/libor maybe even in server's own/libfolder.See also:
Unrelated to the concrete problem, are you well aware that the
<c:forEach>is a view build time tag, not a view render time tag? If you're actually looking for the latter, then you should be using Facelets' own<ui:repeat>tag instead. See also JSTL in JSF2 Facelets... makes sense?