轉(zhuǎn)載自?獲取Spring的ApplicationContext的幾種方式

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Application Context定義

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簡單來說就是Spring中的高級容器，可以獲取容器中的各種bean組件，注冊監(jiān)聽事件，加載資源文件等功能。

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具體定義可以參考官網(wǎng)：https://spring.io/understanding/application-context

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Understanding Application Context

The?ApplicationContext?is the central interface within a Spring application for providing configuration information to the application. It is read-only at run time, but can be reloaded if necessary and supported by the application. A number of classes implement the?ApplicationContext?interface, allowing for a variety of configuration options and types of applications.

The?ApplicationContext?provides:

• Bean factory methods for accessing application components.

• The ability to load file resources in a generic fashion.

• The ability to publish events to registered listeners.

• The ability to resolve messages to support internationalization.

• Inheritance from a parent context.

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Application Context獲取的幾種方式

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1、直接注入

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@Resource

private ApplicationContext ctx;

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2、實現(xiàn)ApplicationContextAware接口（推薦）

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WebApplicationObjectSupport?extends?ApplicationObjectSupport?implements?ServletContextAware

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從上面的繼承關(guān)系看，獲取Application Context還可以繼承WebApplicationObjectSupport 、ApplicationObjectSupport，繼承加強耦合性不推薦。

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3、WebApplicationContextUtils工具類

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ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());

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4、從當前線程綁定獲取（Spring boot不支持）

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ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();

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