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");
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