java - 用于 Java 服务器面孔的 web.xml

Question

我刚刚开始学习 Java 服务器界面，并成功地在 JSF 中测试了我的第一个 Web 应用程序。

令我困惑的是，导航规则是在我的 WEB-INF 文件夹中的 faces-config.xml 中指定的，而在我的 web.xml 中没有指定我的 faces-config.xml 文件位置的位置。

那么导航是如何发生的呢？

Answer 1

JSF 1.2 specification (JSR 252) 要求任何 JSF 实现在启动时自动加载 /WEB-INF/faces-config.xml(如果存在这样的资源)。

引用 10.4.2 应用程序启动行为部分:

At application startup time, before any requests are processed, the JSF implementation must process zero or more application configuration resources, located according to the following algorithm:

• Search for all resources named “META-INF/faces-config.xml” in the ServletContext resource paths for this web application, and load each as a JSF configuration resource (in reverse order of the order in which they are returned by getResources() on the current Thread’s ContextClassLoader).
• Check for the existence of a context initialization parameter named javax.faces.CONFIG_FILES. If it exists, treat it as a comma-delimited list of context relative resource paths (starting with a “/”), and load each of the specfied resources.
• Check for the existence of a web application configuration resource named “/WEB-INF/faces-config.xml”, and load it if the resource exists.