Scott introduces action filters, which are attributes that add pre and post processing logic to controller actions.

Soctt介绍了活动过滤器（action filters），它们都以特性（attributes）的形式为控制器活动添加预处理和后处理逻辑。

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Filters can be used to pre- and post-process controller methods.

过滤器可用于提前或推迟处理控制器方法。

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This example demonstrates the second technique because using filters takes advantage of built-in web application server technology and pre-written code from the Shiro project.

本例展示了第二种技巧，因为使用过滤器充分利用了内置web应用服务器技术以及来自Shiro项目的预先编写好的代码。

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Just hours after Instagram, a mobile app that lets users layer pre-programmed filters over their photos to achieve maximum hipness, launched on Google's Android operating system Tuesday, the snark began.

CNN: iPhone snobbery greets Instagram's Android app