动作类，处理类或对象如何交互及分配职责？

Behavioral, which deal with how classes or objects interact and distribute responsibilities.

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扩展Struts动作类以处理HTTP请求。

Extend the Struts action class to handle the HTTP request.

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提交时，动作类显示成功消息，表示后端服务的调用。

On Submit, the success message is shown from the action class representing the invocation of backend service.

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