Graham, I., Object-Oriented Methods: Principles and Practice (3rd edition), Addison-Wesley, 2001.

面向对象方法：原则和实践(3rd edition)，Addison - Wesley, 2001。

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Again, in practice you also need to supply a username and a password via an Authenticator object.

同样，在实践中也需要通过一个Authenticator对象提供用户名和密码。

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Because the JNDI lookup can be expensive, it is good practice to store the provider object as a member variable of the portlet, and to initialize it in the init method.

因为JNDI查找开销非常大，所以最好的做法是将提供程序对象存储为Portlet的成员变量，并在init方法中对其初始化。

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