为什么Java控制台不显示数据呢

@RequestMapping(value="selectcount", method=RequestMethod.POST)
@ResponseBody
public AjaxRes selectcount(HttpServletRequest request) throws Exception {
AjaxRes ar = getAjaxRes();
List<User> selectcount = service.selectcount();
ar.setSucceed(selectcount);
System.out.println(selectcount);
return ar;