在不被spring容器管理的类中使用ApplicationContext应用上下文bean

@Component
public class ApplicationContextHelper implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        applicationContext = context;
    }

    /**
     * 根据类获取bean
     *
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T popBean(Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(clazz);
    }

    /**
     * 根据类和bean的名字获取bean
     *
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T popBean(String name, Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(name, clazz);
    }
}