Log4J有三个主要部件，它们是记录器（Loggers）、输出源（Appenders）和布局（Logouts）。记录器按照布局中指定的格式把日志信息写入一个或多个输出源。
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wtmp—This file records all logins (and logouts) by users.
这个文件记录了用户进行的所有登录（和注销）。
The lines where you get only the line information are logouts rather than logins, as shown here in this fragment in Listing 20.
获取行信息所在的行是注销而不是登录，如清单20中的代码片段所示。
How is it, then, that Web developers talk about "sessions," "logins" and "logouts," "personalization," "hijacking," and other such inherently stateful ideas?
那么，Web开发人员所说的“会话”、“登录”、“注销”、“个性化”、“hijacking”等有状态概念是如何实现的？
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