本文介绍了Struts2框架中标签使用的三个基本原则，并详细说明了如何在JSP页面中通过Struts2标签获取不同作用域内的对象。包括应用、会话、请求范围的对象及请求参数。
1. Tag使用的三个原则：
struts2/struts-2.0.11/docs/docs/tag-syntax.html
Boiled down, the tag attributes are evaluated using three rules.
- All String attribute types are parsed for the "%{ ... }" notation.
- All non-String attribute types are not parsed, but evaluated directly as an expression
- The exception to rule #2 is that if the non-String attribute uses the escape notion "{%{}", the notation is ignored as redundant, and the content evaluated.
2. JSP里面获取Servlet / JSP Scoped Objects
There are a couple of ways to obtain access to ValueStack from JSPs.
Application Scope Attribute：<s:property value="%{#application.myApplicationAttribute}" />
Session Scope Attribute：<s:property value="%{#session.mySessionAttribute}" />
Request Scope Attribute：<s:property value="%{#request.myRequestAttribute}" />
Request Parameter：<s:property value="%{#parameters.myParameter}" />
Context Scope Parameter：<s:property value="%{#myContextParam}" />
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