@RequestMapping(value = "/delete/{id}", method = RequestMethod.POST)
 public JSONObject delete(@PathVariable Integer id) {
   JSONObject json = new JSONObject();
   try {
     userBiz.delete(id);
     json.put("err", 0);
     json.put("msg", "删除成功!");
   } catch (Exception e) {
     Constans.LOG.error(e);
     json.put("err", 1);
     json.put("msg", "删除失败,错误原因:" + e.getMessage());
   }
   return json;
 }
 @RequestMapping(value = "/add", method = RequestMethod.POST)
 public JSONObject add(@ModelAttribute("user") User user) {
   JSONObject json = new JSONObject();
   try {
     user.setPassword(PwdUtil.md5(user.getUsername() + user.getPassword()));
     userBiz.save(user);
     json.put("err", 0);
     json.put("msg", "保存成功,成功后的ID为:" + user.getId());
   } catch (Exception e) {
     json.put("err", 1);
     json.put("msg", "保存失败!");
     Constans.LOG.error(e);
   }
   return json;
 }
 @RequestMapping(value = "/list/{page}", method = RequestMethod.POST)
 public String list(@PathVariable Integer page) {
   page = page == null ? 1 : page;
   return JSON.toJSONString(userBiz.getUserPage(10, page));
 }