此方法返回与此请求相关联的当前会话；如果没有这样的会话，该方法会自动创建一个并返回新创建的会话句柄。

This method returns the current session associated with this request; if there isn't one, the method creates one automatically and returns the newly created session handle.

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这个叫做jsessionid的十六进制数字是到Geronimo会话句柄的主键，并为系统提供了关于您的信息(您在过去某时提供的)。

The hexadecimal number named jsessionid is the key to the Geronimo session handler and provides the system with information about you that at some time in the past you provided.

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支持Bean获得当前用户会话状态的句柄，因为该状态通过jsf托管Bean功能注入到了支持Bean中。

The backing bean gets a handle to the current user session state because the state is injected into the backing bean via the JSF managed bean facility.

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