请问Struts2在接受一个请求后创建了叫OgnlContext的对象吗

Question

有几个对象感觉很乱，我觉得在Struts2中ActionContext就是OgnlContext的实现

Answer 1

[b]我的理解有点偏差了，看官方文档：[/b]

[url]http://struts.apache.org/2.x/docs/ognl.html[/url]
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[b][quote]
The framework sets the OGNL context to be our ActionContext, and the value stack to be the OGNL root object. (The value stack is a set of several objects, but to OGNL it appears to be a single object.) Along with the value stack, the framework places other objects in the ActionContext, including Maps representing the application, session, and request contexts. These objects coexist in the ActionContext, alongside the value stack (our OGNL root).
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[color=blue][b]大致说说 吧：
Struts2框架，把OGNL的Context设为ActionContext，并且Value Stack是OGNL的根对象。（虽然Value Stack是多个对象的集合，但是对于OGNL来说，Value Stack就是单一的一个对象）。除了 Value Stack ， Struts2框架还将其他对象放在了ActionContext中，这些对象包括：与application、Session、request等相对应的Map。这些对象和Value Stack（我们的OGNL根对象），共同组成了ActionContext。[/b][/color]