If the page output cache duration is longer than the user control output cache duration, the page output cache duration takes precedence.

如果页的输出缓存持续时间长于用户控件的输出缓存持续时间，则页的输出缓存持续时间优先。

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Whereas the cache API is designed to cache data for a long period or until some condition is met, per-request caching simply means caching the data for the duration of the request.

缓存api的设计目的是为了将数据缓存较长的一段时间，或者缓存至满足某些条件时，但每请求缓存则意味着只将数据缓存为该请求的持续时间。

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To make use of expiration-based caching, portlets must define the duration of the expiration cache in the deployment descriptor portlet.xml (for standardized portlet following JSR 168 specification).

为了使用基于过期的缓存，portlet必须在部署描述符portlet . xml(对于符合JSR 168规范的标准化portlet)中定义过期缓存的持续时间。

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