原文：http://blog.csdn.net/u012255097/article/details/53092628
在spring的普通类中：
HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();request.getSession();
在Struts的普通类中：
HttpServletRequest request = ServletActionContext.getRequest();request.getSession();
HttpServletResponse response =ServletActionContext.getResponse();