This layer also handles the requests from the Presentation layer and interacts with the DAL to retrieve the data from the back end and request the DAL to perform data persistence.
这个层还处理来自表示层的请求，并与DAL交互以便从后端检索数据并请求DAL执行数据持久性。
When you open the Sign Up New User application, the Browser request Handler in the Presentation Layer handles the request from a Web interface.
当您打开Sign Up New User应用程序时，表示层中的浏览器请求处理程序将处理来自web界面的请求。
The JSF specification contains a complete presentation of the request processing life cycle, which you'll probably find very useful when developing your own JSF-based applications.
JSF 规范包括了对请求处理生命周期的完整描述，在开发自已的 JSF 应用程序时，您会发现该规范非常有用。
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