我如何通过Ajax从Spring Controller获取数据？

您必须为Spring Ajax调用示例添加@ResponseBody批注

@RequestMapping("/check")     @ResponseBodypublic String check(@RequestParam Integer id, HttpServletRequest request, HttpServletResponse response, Model model) {    boolean a = getSomeResult();    if (a == true) {        model.addAttribute("alreadySaved", true);        return view;    } else {        model.addAttribute("alreadySaved", false);        return view;    }}