MyFaces的ExtensionsFilter

要想用MyFace的扩展包，必须设置一个过滤器。在过滤映射样式中，*.jsf和/faces/*两个缺一不可。

注意后一个映射，/faces/*,用于从MyFace库中抽取图片资源和js等资源的，MyFace的图片资源和js的路径设置均为/faces/...,如果缺少，就找不到这些资源。

在1.1.1中为org.apache.myfaces.component.html.util.ExtensionsFilter

在1.1.3中以上过滤类虽然可以用，但会产生警告。最好用org.apache.myfaces.webapp.filter.ExtensionsFilter

配置片断如下：

<!-- Extensions Filter -->
    <filter>
        <filter-name>extensionsFilter</filter-name>
        <filter-class>org.apache.myfaces.component.html.util.ExtensionsFilter</filter-class>
        <init-param>
            <param-name>uploadMaxFileSize</param-name>
            <param-value>100m</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>
        <init-param>
            <param-name>uploadThresholdSize</param-name>
            <param-value>100k</param-value>
            <description>Set the threshold size - files
                    below this limit are stored in memory, files above
                    this limit are stored on disk.

                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB
            </description>
        </init-param>
<!--        <init-param>
            <param-name>uploadRepositoryPath</param-name>
            <param-value>/temp</param-value>
            <description>Set the path where the intermediary files will be stored.
            </description>
        </init-param>-->
    </filter>

    <filter-mapping>
        <filter-name>extensionsFilter</filter-name>
        <url-pattern>*.jsf</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>extensionsFilter</filter-name>
        <url-pattern>/faces/*</url-pattern>
    </filter-mapping>