对于session.getAttribute("user");不能用问题的解决办法

		HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()) .getRequest();
		HttpSession  session = request.getSession();
		User user = (User) session.getAttribute("user");
		
		if(user!=null)
		{
		userService.loginSuccess(user);
		}

session.getAttribute("user");不能用
多半是没配置web.xml
在web.xml里加listener

 
    org.springframework.web.context.request.RequestContextListener
  

P.S. 可以有多个listener 
比如

    org.springframework.web.context.request.RequestContextListener
  
  
  
    org.springframework.web.context.ContextLoaderListener