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.

Application Context获取的几种方式

1、直接注入

@Resource

private ApplicationContext ctx;

2、实现ApplicationContextAware接口（推荐）

WebApplicationObjectSupport extends ApplicationObjectSupportimplements ServletContextAware

从上面的继承关系看，获取Application Context还可以继承WebApplicationObjectSupport 、ApplicationObjectSupport，继承加强耦合性不推荐。

3、WebApplicationContextUtils工具类

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

4、从当前线程绑定获取（Spring boot不支持）

ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();

巴特西

获取Spring的ApplicationContext的几种方式

Understanding Application Context

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