protected WebApplicationContext createWebApplicationContext(   
      ServletContext servletContext, ApplicationContext parent) throws BeansException ...{   
<span style="color:red;">   
    //根据servletContext来决定要实例化的WebApplicationContext   
    Class contextClass = determineContextClass(servletContext);   
    if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) ...{   
      throw new ApplicationContextException("Custom context class [" + contextClass.getName() +   
          "] is not of type ConfigurableWebApplicationContext");   
    }   
    ConfigurableWebApplicationContext wac =   
        (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);   
    wac.setParent(parent);   
    wac.setServletContext(servletContext);   
  
    //得到WEB.XML中设置的SPRING配置文件位置   
    String configLocation = servletContext.getInitParameter(CONFIG_LOCATION_PARAM);   
    if (configLocation != null) ...{   
      //把配置文件分段后设置到WebApplicationContext的ConfigLocations中   
      wac.setConfigLocations(StringUtils.tokenizeToStringArray(configLocation,   
          ConfigurableWebApplicationContext.CONFIG_LOCATION_DELIMITERS));   
    }   
    //刷新WebApplicationContext   
    wac.refresh();   
</span>   
    return wac;   
  }