HttpServletRequest?httpRequest=(HttpServletRequest)request;??String?strBackUrl?=?"http://"?+?request.getServerName()?//服務器地址??+?":"???+?request.getServerPort()???????????//端口號??+?httpRequest.getContextPath()??????//項目名稱??+?httpRequest.getServletPath()??????//請求頁面或其他地址??+?"?"?+?(httpRequest.getQueryString());?//參數??