This data will be saved to the ValueStack during processing of requests.
这些数据会在处理请求过程中保存到ValueStack中。
By using getter and setter methods, the Action class will save the user values onto the ValueStack.
通过使用getter和setter方法，Action方法将把用户值保存到ValueStack中。
ValueStack, one of the powerful features of Struts 2, holds all the data during processing of a request.
ValueStack是Struts 2的强大功能之一，用于保存处理请求过程中的所有数据。
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