springMVC 使用WebApplicationContext获取ApplicationContext对象

主要用于从application中获取bean

1、applicationContext

在web.xml中使用listener配置

<context-param>  <param-name>contextConfigLocation</param-name>  <param-value>classpath:applicationContext.xml</param-value></context-param><listener>  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

使用WebApplicationContext获取

WebApplicationContext webApplicationContext =ContextLoader.getCurrentWebApplicationContext();  

2、springMVC-serlvet

在web.xml中使用servlet配置

<servlet>  <servlet-name>springMVC</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <init-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:springMVC-servlet.xml</param-value>  </init-param>  <load-on-startup>1</load-on-startup></servlet><servlet-mapping>  <servlet-name>springMVC</servlet-name>  <url-pattern>/</url-pattern></servlet-mapping>

使用ServletContext获取

ServletContext servletContext=request.getSession().getServletContext();WebApplicationContext webApplicationContext = (WebApplicationContext)servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);