获取Spring的ApplicationContext的几种方式

Application Context定义

简单来说就是Spring中的高级容器，可以获取容器中的各种bean组件，注册监听事件，加载资源文件等功能。

具体定义可以参考官网：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获取的几种方式

1、直接注入

@Resource

private ApplicationContext ctx;

2、实现ApplicationContextAware接口（推荐）

WebApplicationObjectSupport extends ApplicationObjectSupport implements 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();

近期热文推荐：

1.Java 15 正式发布， 14 个新特性，刷新你的认知！！

2.终于靠开源项目弄到 IntelliJ IDEA 激活码了，真香！

3.我用 Java 8 写了一段逻辑，同事直呼看不懂，你试试看。。

4.吊打 Tomcat ，Undertow 性能很炸！！

5.《Java开发手册（嵩山版）》最新发布，速速下载！

觉得不错，别忘了随手点赞+转发哦！