Getting Spring Application Context

最新推荐文章于 2025-09-06 16:35:37 发布

转载最新推荐文章于 2025-09-06 16:35:37 发布 · 291 阅读

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本文探讨了在Spring应用中如何全局地获取ApplicationContext实例。通过实现ApplicationContextAware接口或使用@Autowired注解，可以方便地让需要访问容器的类获得ApplicationContext。对于容器外部的对象，则建议采用GoF单例模式来管理Spring容器。

Is there a way to statically/globally request a copy of the ApplicationContext in a Spring application?

Assuming the main class starts up and initializes the application context, does it need to pass that down through the call stack to any classes that need it, or is there a way for a class to ask for the previously created context? (Which I assume has to be a singleton?)

If the object that needs access to the container is a bean in the container, just implement the BeanFactoryAware or ApplicationContextAware interfaces.

If an object outside the container needs access to the container, I’ve used a standard GoF singleton pattern for the spring container. That way, you only have one singleton in your application, the rest are all singleton beans in the container.

You can implement ApplicationContextAware or just use @Autowired:

public class SpringBean {
  @Autowired
  private ApplicationContext appContext;
}

SpringBean will have ApplicationContext injected, within which this bean is instantiated. For example if you have web application with a pretty standard contexts hierarchy:

main application context <- (child) MVC context

and SpringBean is declared within main context, it will have main context injected; otherwise, if it’s declared within MVC context, it will have MVC context injected.