关于前后台传值：

controller层：

public ModelAndView goAdd(HeheEntity hehe, HttpServletRequest req) {
   String id = req.getParameter("id");//拿到前台的数据id

   String name = req.getParameter("gg");//拿到前台的数据gg

   System.out.println(name);

   String Sql = "select gg from hehe ";

   List<String> heheList = systemService.findListbySql(Sql);

   req.setAttribute("hehePage", heheList);  //拿到数据库的信息