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);

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