问题描述
当 ActionMapper ， ActionProxy ， ActionInvocation ， ActionContext 是在Struts2应用程序中创建的.当我刚接触Struts2框架时，我对这些对象的范围感到非常困惑.
Can any one please describe me when the objects of ActionMapper, ActionProxy, ActionInvocation, ActionContext are created in a Struts2 application. As I am new to Struts2 framework, I am very much confused about the scopes of these objects.
推荐答案
ActionMapper 是在启动时创建的，具有单例作用域.
The ActionMapper is created on startup, it has a singleton scope.
ActionContext 由 Dispatcher创建在准备执行的操作中，它是 ThreadLocal ，它没有任何作用域.
The ActionContext is created by the Dispatcher in preparing an action to execute, it's ThreadLocal, and it doesn't have any scope.
执行操作时 和 ActionProxy 创建的也没有作用域.
When action is executing the ActionInvocation and ActionProxy are created that also don't have a scope.
您可以在Struts2体系结构的大图上看到这一点.
You can see this on a big picture of Struts2 architecture.
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