springmvc controller层

@Controllerpublic class UsersController {    private Logger log = Logger.getLogger(UsersController.class);    @Autowired    private UsersService usersService;    @RequestMapping("/getAllUsers")    @ResponseBody    public List getAllUsers() {        List<Users> list = null;        try {            list = usersService.findAllUsers();        } catch (Exception e) {            log.error("Exception",e);        }        return list;    }    @RequestMapping("/addUsesr")    @ResponseBody    public String addUsesr() {        Users user = new Users();        user.setUserName("user66");        user.setPassword("123456666");        int res = 0;        try {            res = usersService.addUser(user);        } catch (Exception e) {            log.error("Rollback",e);        }        return res+"";    }}