Spring获取Bean工具类

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@Component public class SpringContextHolder implements ApplicationContextAware {       private static ApplicationContext applicationContext;       @Override     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {         SpringContextHolder.applicationContext = applicationContext;     }       public static ApplicationContext getApplicationContext() {         assertApplicationContext();         return applicationContext;     }       @SuppressWarnings("unchecked")     public static <T> T getBean(String beanName) {         assertApplicationContext();         return (T) applicationContext.getBean(beanName);     }       public static <T> T getBean(Class<T> requiredType) {         assertApplicationContext();         return applicationContext.getBean(requiredType);     }       private static void assertApplicationContext() {         if (SpringContextHolder.applicationContext == null) {             throw new RuntimeException("applicaitonContext属性为null,请检查是否注入了SpringContextHolder!");         }     }   }