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);
参考：springMVC 使用WebApplicationContext获取ApplicationContext对象
springMVC 使用WebApplicationContext获取ApplicationContext对象
原文：https://www.cnblogs.com/aspirant/p/9603618.html