Application Context 定义

简略来说就是 Spring 中的高级容器，能够获取容器中的各种 bean 组件，注册监听事件，加载资源文件等性能。

具体定义能够参考官网：https://spring.io/understandi…

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 获取的几种形式

1、间接注入

@Resource

private ApplicationContext ctx;

2、实现 ApplicationContextAware 接口（举荐）

WebApplicationObjectSupport extends ApplicationObjectSupport implements ServletContextAware

从下面的继承关系看，获取 Application Context 还能够继承 WebApplicationObjectSupport、ApplicationObjectSupport，继承增强耦合性不举荐。

3、WebApplicationContextUtils 工具类

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

4、从以后线程绑定获取（Spring boot 不反对）

ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();

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