code: public static void saveActionForm(ActionForm form, ActionMapping mapping, HttpServletRequest request) {
  		if ((form != null) && (mapping.getAttribute() != null)) {
  			if ("request".equals(mapping.getScope())) {
  				request.setAttribute(mapping.getAttribute(), form);
  			} else {
  				HttpSession session = request.getSession();
  				session.setAttribute(mapping.getAttribute(), form);
  				request.setAttribute(mapping.getAttribute(), form);
  			}
  		}
  	}
docs: 将ActionForm保存在struts_config.xml定义的attribute中
  
  @param form
  @param mapping
  @param request