获取Spring容器管理的Bean工具类

很多时候我们在一些不受spring管理的类中需要用到spring管理的Bean，那么这个时候可以使用如下工具类从spring容器中获取相关的Bean实例。

@Component
public class SpringApplicationContextUtils implements ApplicationContextAware {private static final Logger log = LoggerFactory.getLogger(SpringApplicationContextUtils.class);private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext context) throws BeansException {log.info("【Spring】注入spring容器开始，context:{}", context);if(applicationContext == null) {applicationContext = context;}log.info("【Spring】注入spring容器结束，SpringApplicationContextUtils.applicationContext：{}", applicationContext);}public static ApplicationContext getApplicationContext() {return applicationContext;}public static Object getBean(String beanName) {return applicationContext.getBean(beanName);}public static <T> T getBean(Class<T> clazz) {return applicationContext.getBean(clazz);}public static <T> T getBean(String beanName, Class<T> clazz) {return applicationContext.getBean(beanName, clazz);}
}