struts2 learn

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.

 

内容概要:本文探讨了在MATLAB/SimuLink环境中进行三相STATCOM(静态同步补偿器)无功补偿的技术方法及其仿真过程。首先介绍了STATCOM作为无功功率补偿装置的工作原理,即通过调节交流电压的幅值和相位来实现对无功功率的有效管理。接着详细描述了在MATLAB/SimuLink平台下构建三相STATCOM仿真模型的具体步骤,包括创建新模型、添加电源和负载、搭建主电路、加入控制模块以及完成整个电路的连接。然后阐述了如何通过对STATCOM输出电压和电流的精确调控达到无功补偿的目的,并展示了具体的仿真结果分析方法,如读取仿真数据、提取关键参数、绘制无功功率变化曲线等。最后指出,这种技术可以显著提升电力系统的稳定性与电能质量,展望了STATCOM在未来的发展潜力。 适合人群:电气工程专业学生、从事电力系统相关工作的技术人员、希望深入了解无功补偿技术的研究人员。 使用场景及目标:适用于想要掌握MATLAB/SimuLink软件操作技能的人群,特别是那些专注于电力电子领域的从业者;旨在帮助他们学会建立复杂的电力系统仿真模型,以便更好地理解STATCOM的工作机制,进而优化实际项目中的无功补偿方案。 其他说明:文中提供的实例代码可以帮助读者直观地了解如何从零开始构建一个完整的三相STATCOM仿真环境,并通过图形化的方式展示无功补偿的效果,便于进一步的学习与研究。
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