配置过滤器XML配置

<!-- 配置过滤器 -->
    <filter>
        <filter-name>x</filter-name>
        <filter-class>cn.sky.util.EncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>x</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>