在 JSF 2中 faces-config.xml 的用途是什么？

在 JSF2大力支持注释之后，我想知道我将使用 faces-config.xml做什么。现在它的重要性是什么？

换句话说，什么配置只能通过 faces-config.xml而不能通过注释来完成？

现在我使用它的全部目的是声明 Spring 的 EL 解析器。

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">


<application>
<el-resolver>
org.springframework.web.jsf.el.SpringBeanFacesELResolver
</el-resolver>
</application>
</faces-config>
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最佳答案

It's still to be used for many things which can't be annotated. E.g. custom JSF validation messages:

<application>
<message-bundle>com.example.i18n.messages</message-bundle>
</application>

A global i18n bundle (so that you don't need to declare <f:loadBundle> in every view):

<application>
<resource-bundle>
<base-name>com.example.i18n.Text</base-name>
<var>text</var>
</resource-bundle>
</application>

Explicitly supported i18n locales (so that the not-declared ones will be ignored even though there's a message bundle or resource bundle for it):

<application>
<locale-config>
<default-locale>en</default-locale>
<supported-locale>nl</supported-locale>
<supported-locale>es</supported-locale>
<supported-locale>de</supported-locale>
</locale-config>
</application>

Custom view handlers:

<application>
<view-handler>com.example.SomeViewHandler</view-handler>
</application>

Phase listeners (there's still no annotation for that):

<lifecycle>
<phase-listener>com.example.SomePhaseListener</phase-listener>
</lifecycle>

Managed beans which can't be annotated (the below one gives current Date on #{now}):

<managed-bean>
<description>Current date and time</description>
<managed-bean-name>now</managed-bean-name>
<managed-bean-class>java.util.Date</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>

Custom factories, such as custom exception handler factory (it also allows factories for FacesContext, ExternalContext, LifeCycle and many more so that you can provide your custom implementation):

<factory>
<exception-handler-factory>com.example.SomeExceptionHandlerFactory</exception-handler-factory>
</factory>

To name only the commonly used ones. If you have faces-config.xml tag autocompletion in your IDE, you can find them all out. Only the managed beans, validators, converters, components, renderers and point-to-point navigation cases are not needed anymore thanks to the new annotations and implicit navigation.


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