Declare a variable for the SipFactory and import it. Then, in the servlet initialization, set the SipFactory.

为SipFactory声明一个变量，并导入该变量。

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Listing 4 shows an example of a closure that will import a variable from the outside environment and simply print it out to the screen.

清单4显示了从外部环境导入变量并将其简单地输出到屏幕上的闭包示例。

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Import the edited variable library into the template.

导入变量图书馆编辑的模板。

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