Spring中ApplicationContextAware接口使用理解

 1 import org.springframework.beans.BeansException; 2 import org.springframework.context.ApplicationContext; 3 import org.springframework.context.ApplicationContextAware; 4 /** 5  * Created by zl on 2018/7/7. 6  */ 7 public class BeanFactoryUtil implements ApplicationContextAware { 8     protected static ApplicationContext ctx = null; 9  10     @Override11     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {12         ctx = applicationContext;13     }14  15     public static Object getBean(String beanId) {16         return ctx.getBean(beanId);17     }18 }

<bean id="beanFactoryUtil" class="com.boss.utils.BeanFactoryUtil"/>

@Testpublic void test() {  new ClassPathXmlApplicationContext("applicationContext.xml");// 加載applicationContext.xml（模擬啟動web服務）
  UserDao userDaoImpl = (UserDao) BeanFactoryUtil.getBean("userDaoImpl");
  userDaoImpl.sayHello();
}