spring data jpa update

一：在controller  加上：

@Controller
@RequestMapping("/user")
public class UserController {@Autowiredprivate UserService userService;private static final Logger LOG = LoggerFactory.getLogger(UserController.class);/*************use to update  part is null problem*********************/@ModelAttribute  public void getUser(@RequestParam(value = "id", required = false) Integer id, Model model) {if (id != null) {User user = userService.getById(id);model.addAttribute("user", user);}}/************** tologin ****************/@RequestMapping(value="/tologin",method = RequestMethod.GET)public String toLogin(){return "redirect:/index.html";}

 

二：

update 的时候使用 save 即可：