Spring 获取ApplicationContext

 package com.demo;

 import org.springframework.beans.BeansException;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.stereotype.Component;

 @Component
 public class SpringUtils implements ApplicationContextAware {
     private static ApplicationContext applicationContext = null;

     @Override
     public void setApplicationContext(ApplicationContext arg0) throws BeansException {
         if (SpringUtils.applicationContext == null) {
             SpringUtils.applicationContext = arg0;
         }
     }

     // 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> T getBean(Class<T> clazz) {
         return getApplicationContext().getBean(clazz);
     }

     // 通过name,以及Clazz返回指定的Bean
     public static <T> T getBean(String name, Class<T> clazz) {
         return getApplicationContext().getBean(name, clazz);
     }

 }