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

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】

<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】

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】

<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>

【jsp/servlet】

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

原文：http://chanson.iteye.com/blog/223263