MyFacesフィルタの例

<context-param>
   <param-name>org.apache.myfaces.CHECK_EXTENSIONS_FILTER</param-name>
   <param-value>true</param-value>
   <init-param>
       <param-name>maxFileSize</param-name>
       <param-value>20m</param-value>
       <description>Set the size limit for uploaded files.
            Format: 10 - 10 bytes
                    10k - 10 KB
                    10m - 10 MB
                    1g - 1 GB
       </description>
   </init-param>
</context-param>
<filter>
   <filter-name>extensionsFilter</filter-name>
   <filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
</filter>
<filter-mapping>
   <filter-name>extensionsFilter</filter-name>
   <url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
</filter-mapping>
<filter-mapping>
   <filter-name>extensionsFilter</filter-name>
   <url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
   <filter-name>extensionsFilter</filter-name>
   <servlet-name>Faces Servlet</servlet-name>
</filter-mapping>