springMVC初识，后台传给前台页面数据的4种方法

来源：互联网发布：gis数据挖掘前景编辑：程序博客网时间：2024/06/06 22:45

前三种返回值都是String 返回视图名称

@RequestMapping(value="/test.do",method = RequestMethod.POST)public String checknameIsExist(@RequestParam("sid") String sid,Model model,HttpServletRequest request,Map map) {Student stu = studentService.getStudent(sid);if(stu != null){System.out.println(stu.getSname());}//1.放在model里 建议使用   model.addAttribute("mode", "modeValue");//2.放在request里request.setAttribute("request", "requestValue");//3.放在map里map.put("map", "mapvalue"); List<String> list = new ArrayList<String>();list.add("1");list.add("2");list.add("3");map.put("listmap", list); return "user";}

这最后一种返回的类型是 ModelAndView，把值放在ModelAndView对象中

@RequestMapping(value="/test2.do",method = RequestMethod.POST)public ModelAndView checknameIsExist2(@RequestParam("sid") String sid,Model model,HttpServletRequest request) {ModelAndView mav = new ModelAndView("user");mav.addObject("ModelAndView", "ModelAndViewValue");mav.setViewName("user");return mav;}

页面取数据：${key}

0 0