Once your data model has been registered, you can use the DataFactory class to create instances of your data model.

注册了数据模型后，就可以使用 DataFactory 类来创建数据模型的实例。

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Because the DataFactory class implements the ServletContextListener interface, it guarantees that its init method is called when the servlet context is first created.

因为DataFactory类实现了ServletContextListener接口，所以可以保证在第一次创建servlet上下文时调用其init方法。

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