对于UNIX操作系统，将从地区设置推导出环境，包括语言、区域和编码集。

For the UNIX operating system, the active environment will be derived from locale setting including language, territory, and code set.

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如果尚未设置这些配置变量，那么就使用JVM的缺省语言环境，该缺省语言环境是从jsp容器所运行的操作系统中获取的。

If these configuration variables have not been set, then the JVM's default locale is used, which is obtained from the operating system the JSP container is running on.

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就是说获取的应该是操作系统的设置语言。

Retrieves the operating system's natural language setting.

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