SpringUtil.java工具类有什么用啊?

为什么要继承ApplicationContextAware实现ApplicationContext的这些相关方法,感觉这些方法都在spring中有提供的啊,写这个SpringUtil.java工具类有什么用啊?在代码中也没有看到别的地方有对这个工具类的引用??
代码如下:

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
 
public class SpringContextUtil implements ApplicationContextAware {  
   private static ApplicationContext applicationContext;     //Spring应用上下文环境  
     
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {  
       SpringContextUtil.applicationContext = applicationContext;  
   }  

   public static ApplicationContext getApplicationContext() {  
     return applicationContext;  
   }  
    
   public static Object getBean(String name) throws BeansException {  
     return applicationContext.getBean(name);  
   } 
   
   public static <T> T getBean(Class<T> requiredType) {
       return applicationContext.getBean(requiredType);
   }
    
public static <T> T getBean(String name, Class<T> requiredType) throws BeansException {  
     return applicationContext.getBean(name, requiredType);  
   }  
    
   public static boolean containsBean(String name) {  
     return applicationContext.containsBean(name);  
   }  
    
   public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {  
     return applicationContext.isSingleton(name);  
   }  

   @SuppressWarnings("rawtypes")
public static Class getType(String name) throws NoSuchBeanDefinitionException {  
     return applicationContext.getType(name);  
   }  
    
   public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {  
     return applicationContext.getAliases(name);  
   }  
 }  
查看回复