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;


    @Override
    public 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);
    }
}