java后台獲取服務器相對路徑，獲取當前時間yyyyMMddHHmmssSSS

SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS");

Date date = new Date();
String nowData = format.format(date);

//直接獲取到服務器工程名路徑下面

String path = request.getSession().getServletContext().getRealPath("pdf/ElecScan"+nowData+".pdf");