如何使用Guice的喷油器? [英] How to use Guice's Injector?

问题描述

我正在学习Guice，但我不清楚如何使用Injector实例.最好在应用程序引导程序上创建一次Injector实例，并将其设为公共单例?

I'm in process of learning Guice and I don't clearly understand how to use Injector instance. It's better to create Injector instance once on application bootstrap, and make it public singleton?

难道我们总是必须使用Injector#getInstance(SomeClass.class)来获取将Guice的@Inject注释放入其中的类吗?

And is it true that we always must use Injector#getInstance(SomeClass.class) to get classes where we putted Guice's @Inject annotations?

推荐答案

您不应将注入器作为全局单例传递.您是否看过: https://github.com/google/guice/wiki/GettingStarted?请注意，RealBillingService不会使用注入器来获取CreditCardProcessor和TransactionLog的实例.相反，Guice在创建实例时会为您处理所有这一切.

You should not pass the injector around as a global singleton. Have you looked at: https://github.com/google/guice/wiki/GettingStarted? Note that RealBillingService does not use the injector to get instances of CreditCardProcessor and TransactionLog. Instead Guice handles all this for you when creating the instance.

如果您需要Guice创建许多相同类型的对象，请考虑使用

If you're in a situation where you need Guice to create many objects of the same type consider using a Provider and injecting that provider.

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