@Controller@RequestMapping("/detail")public class DetailController { @Autowired private DetailService detailService; @RequestMapping("/day") public @ResponseBody Object day(HttpServletRequest request){? ? ? ? ? ? ?SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); ? ?Map<String, Object> params = new HashMap<String, Object>(); ?//解釋一下這個Map有什么作用.謝謝！? ? ? ? ? ? ? ? //獲取日期及作者id String date = request.getParameter("date"); String authorid = request.getParameter("authorid"); //為空或為null 賦一個新值 if(date==null||"".equals(date)){ date = sdf.format(new Date()); } //賦值 ? date ? params.put("date", date); params.put("authorid", authorid); //調(diào)用service List<Map<String, Object>> list = detailService.dayDetail(params); // 清除 params.clear(); // params.put("rows", list); //{rows:[{},{},{}]} ? json return params; }