@RequestMapping("/updateUser")
 public String updateUser(User user, HttpServletRequest request) {
   if (userService.updateUser(user)) {
     return "redirect:/user/getalluser";
   } else {
     return "error";
   }
 }
 @RequestMapping("/deleteUser")
 public void deleteUser(String id, HttpServletRequest request, HttpServletResponse response) {
   String result = "{\"msg\":\"success\"}";
   String error = "{\"msg\":\"error\"}";
   try {
     PrintWriter pw = response.getWriter();
     if (userService.deleteUser(id)) {
       pw.print(result);
     } else {
       pw.print(error);
     }
   } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
 }
 @RequestMapping("/toedit")
 public String toeditUser(String id, HttpServletRequest request) {
   User user = userService.getSingleUser(id);
   request.setAttribute("user", user);
   return "edit";
 }
 @RequestMapping("/getalluser")
 public String getAllUser(User user, HttpServletRequest request) {
   List<User> userlist = userService.getAllUser();
   request.setAttribute("userlist", userlist);
   return "usermanager";
 }
 @RequestMapping("/addUser")
 public String addUser(User user) {
   userService.addUser(user);
   // SpringMVC重定向
   return "redirect:/user/getalluser";
 }