映射元素用于将请求映射为一个基于内容路径的目标URL。
A mapping element is used to map incoming requests to a target URL based on their context path.
action元素描述了从请求路径到相应的action类的映射，应该用这些类来处理来自这个路径的请求。
The action element describes a mapping from a request path to the corresponding action classes that should be used to process the requests.
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