Ehcache 使用SimplePageCachingFilter进行页面缓存，中文出现乱码

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<!--ehcache 页面缓存过滤器 -->
<filter>
    <filter-name>simplePageCachingFilter</filter-name>
    <filter-class>net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter</filter-class>
    <init-param>
        <param-name>cacheName</param-name>
        <param-value>SimplePageCachingFilter</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>simplePageCachingFilter</filter-name>
    <url-pattern>/app/*</url-pattern>
</filter-mapping>