当某个Bean会注册到容易，但是在需要的时候还没有注册到容易。可以通过ApplicationContent来获取。

import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;@Componentpublic class SpringUtil implements ApplicationContextAware {    private static ApplicationContext applicationContext;    @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {        if(SpringUtil.applicationContext == null) {            SpringUtil.applicationContext = applicationContext;        }    }    //获取applicationContext    public static ApplicationContext getApplicationContext() {        return applicationContext;    }    //通过name获取 Bean.    public static Object getBean(String name){        return getApplicationContext().getBean(name);    }    //通过class获取Bean.    public static 
    
      T getBean(Class
     
       clazz){        return getApplicationContext().getBean(clazz);    }    //通过name,以及Clazz返回指定的Bean    public static 
      
        T getBean(String name,Class
       
         clazz){        return getApplicationContext().getBean(name, clazz);    }}