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最新推荐文章于 2021-08-06 08:56:08 发布

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最新推荐文章于 2021-08-06 08:56:08 发布

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分类专栏： struts2 文章标签： struts action webwork processing servlet filter

本文链接：https://blog.youkuaiyun.com/news_2010/article/details/5810182

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本文介绍了Struts2框架，强调其并非Struts1的简单升级，而是一个全新的框架，基于OpenSymphony WebWork构建。文章详细阐述了Struts2的核心组件，包括控制器FilterDispatcher的工作原理，以及拦截器和OGNL在请求处理过程中的作用。

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Struts 2 isn’t just a new release of the older Struts 1 framework. It is a completely new framework, based on the esteemed OpenSymphony WebWork framework.

Since we’ve stressed that Struts 2 is truly a new framework, you might be wondering how hard it will be to move from Struts 1 to Struts 2. There are some things to learn, interceptors and OGNL in particular.

The role of the controller is played by the Struts 2 FilterDispatcher. This important object is a servlet filter that inspects each incoming request to determine which Struts 2 action should handle the request.

it’s easy to see that the model is implemented by the Struts 2 action component. But what exactly is the model? I find the model the most nebulous of the MVC triad.

INTERCEPTORS

most every
action will have a stack of interceptors associated with it. These interceptors are invoked both before and after the action, though we should note that they actually fire after the result has executed. Interceptors don’t necessarily have to do something both times they fire, but they do have the opportunity. Some interceptors only do work
before the action has been executed, and others only do work afterward.

THE VALUESTACK AND OGNL

The data in the ValueStack follows the request processing through all phases; it slices through the whole length of the framework. It can do this because it is stored in a ThreadLocal context called the ActionContext.