Spring获取WebApplicationContext为null解决方案
在web.xml中配置Spring，配置如下
<servlet>
<servlet-name>springServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
在Servlet中通过WebApplicationContextUtils.getWebApplicationContext(getServletContext())获取WebApplicationContext对象为null。这是由于除了配置DispatcherServlet，还需要配置ContextLoaderServlet，否则无法获取WebApplicationContext。配置方法如下，在web.xml中加入
<servlet>
<servlet-name>context</servlet-name>
<servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
