使用web.xml方式加载 Spring时，获取Spring context的两种方式：

1、servlet方式加载时：

【web .xml】

Xml代码

 <servlet>  
         <servlet-name>dispatcherServlet</servlet-name>  
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
         <init-param>  
             <param-name>contextConfigLocation</param-name>  
             <param-value>/WEB-INF/applicationContext</param-value>  
         </init-param>  
 </servlet>  

【jsp/servlet】

Java代码

 ServletContext context = getServletContext();    
 XmlWebApplicationContext applicationContext = (XmlWebApplicationContext)   
   
   
 context.getAttribute("org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcherServlet");   
   
   
 DataSource dataSource=(DataSource)applicationContext.getBean("dataSource");  

2、listener方式加载时：

【web .xml】

Xml代码 

 <context-param>   
  <param-name>contextConfigLocation</param-name>   
   <param-value>/WEB-INF/applicationContext</param-value>   
  </context-param>   
   
 <listener>   
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>   
 </listener> 

Java代码

 ServletContext context = getServletContext();   
   
       
   WebApplicationContext applicationContext  = WebApplicationContextUtils   
     .getWebApplicationContext(context);   
       
  
 
 DataSource dataSource=(DataSource)applicationContext.getBean("dataSource");