1.在初始化时保存ApplicationContext对象

2.通过Spring提供的utils类获取ApplicationContext对象

3.继承自抽象类ApplicationObjectSupport

4.继承自抽象类WebApplicationObjectSupport

5.实现接口ApplicationContextAware

6.通过Spring提供的ContextLoader

 

来说一下实现接口的方法：

@Component
public class example implements ApplicationContextAware {private static ApplicationContext context;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {context = applicationContext;}example(){}public static TypeHandler createHandler(Type type) throws Exception{if(type==null){throw new Exception("handler type is null");}return (TypeHandler) context.getBean(type.getShortName()+"Handler");}}

实现接口之后，getBrean时要实现类型转换