Spring获取ApplicationContext对象工具类的实现方法

package com.util;  import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;  final public class ApplicationContextUtil {    private static ApplicationContext ac=null;      private ApplicationContextUtil(){        }      static{     ac=new ClassPathXmlApplicationContext("applicationContext.xml");   }      public static ApplicationContext getApplicationContext(){     //获得返回的容器对象     return ac;   }    } 

public static void getByUtil(){     ApplicationContextUtil.getApplicationContext().getBean("userService");   }