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);

参考：springMVC 使用WebApplicationContext获取ApplicationContext对象