[springboot 开发单体web shop] 3. 用户注册实现

    - Backend valid  后端校验是为了防止某些不法小伙伴绕开前端从而直接访问我们的api造成数据请求服务器错误，或者前端小伙伴程序有bug...无论是哪一种可能性，都有可能造成严重的后果。
 

- email & mobile invalid  因为本人没有追求email / 短信发送服务器，所以这一步就pass，小伙伴们可以自行研究哈。
 

public interface IUserService {

    /**
     * 根据用户名查询用户是否存在
     *
     * @param username
     * @return
     */
    Users findUserByUserName(String username);

    /**
     * 创建用户
     *
     * @param userRequestDTO 用户请求dto
     * @return 当前用户
     */
    Users createUser(UserRequestDTO userRequestDTO) throws Exception;
}

@Service
@Slf4j
public class UserServiceImpl implements IUserService {
    private final String FACE_IMG = "https://avatars1.githubusercontent.com/u/4083152?s=88&v=4";

    // 构造器注入
    private final UsersMapper usersMapper;
    private final Sid sid;

    @Autowired
    public UserServiceImpl(UsersMapper usersMapper, Sid sid) {
        this.usersMapper = usersMapper;
        this.sid = sid;
    }

    @Override
    public Users findUserByUserName(String username) {
        // 构建查询条件
        Example example = new Example(Users.class);
        val condition = example.createCriteria()
                .andEqualTo("username", username);
        return this.usersMapper.selectOneByExample(example);
    }

    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public Users createUser(UserRequestDTO userRequestDTO) throws Exception {
        log.info("======begin create user : {}=======", userRequestDTO);
        val user = Users.builder()
                .id(sid.next()) //生成分布式id
                .username(userRequestDTO.getUsername())
                .password(MD5GeneratorTools.getMD5Str(userRequestDTO.getPassword()))
                .birthday(DateUtils.parseDate("1970-01-01", "yyyy-MM-dd"))
                .nickname(userRequestDTO.getUsername())
                .face(this.FACE_IMG)
                .sex(SexEnum.secret.type)
                .createdTime(new Date())
                .updatedTime(new Date())
                .build();
        this.usersMapper.insertSelective(user);
        log.info("======end create user : {}=======", userRequestDTO);
        return user;
    }
}

@RestController
@RequestMapping(name = "/users")
@Slf4j
@Api(tags="用户管理")
public class UserController {

    @Autowired
    private IUserService userService;

    @ApiOperation("校验是否重名")
    @GetMapping("/validateUsername")
    public JsonResponse validateUsername(@RequestParam String username) {
        // 判断用户名是否非法
        if (StringUtils.isBlank(username))
            return JsonResponse.errorMsg("用户名不能为空！");
        if (null != userService.findUserByUserName(username))
            return JsonResponse.errorMsg("用户名已存在！");
        // 用户名可用
        return JsonResponse.ok();
    }

    @ApiOperation("创建用户")
    @PostMapping("/create")
    public JsonResponse createUser(@RequestBody UserRequestDTO userRequestDTO) {
        try {
            if (StringUtils.isBlank(userRequestDTO.getUsername()))
                return JsonResponse.errorMsg("用户名不能为空");
            if (null != this.userService.findUserByUserName(userRequestDTO.getUsername())) {
                return JsonResponse.errorMsg("用户名已存在！");
            }
            if (StringUtils.isBlank(userRequestDTO.getPassword()) ||
                    StringUtils.isBlank(userRequestDTO.getConfimPassword()) ||
                    userRequestDTO.getPassword().length() < 8) {
                return JsonResponse.errorMsg("密码为空或长度小于8位");
            }
            if (!userRequestDTO.getPassword().equals(userRequestDTO.getConfimPassword()))
                return JsonResponse.errorMsg("两次密码不一致！");
            val user = this.userService.createUser(userRequestDTO);
            if (null != user)
                return JsonResponse.ok(user);
        } catch (Exception e) {
            log.error("创建用户失败,{}", userRequestDTO);
        }
        return JsonResponse.errorMsg("创建用户失败");
    }
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class JsonResponse {

    // 定义jackson对象
    private static final ObjectMapper MAPPER = new ObjectMapper();
    // 响应业务状态
    private Integer status;
    // 响应消息
    private String message;
    // 响应中的数据
    private Object data;

    public static JsonResponse build(Integer status, String msg, Object data) {
        return new JsonResponse(status, msg, data);
    }

    public static JsonResponse ok(Object data) {
        return new JsonResponse(data);
    }

    public static JsonResponse ok() {
        return new JsonResponse(null);
    }

    public static JsonResponse errorMsg(String msg) {
        return new JsonResponse(500, msg, null);
    }

    public static JsonResponse errorMap(Object data) {
        return new JsonResponse(501, "error", data);
    }

    public static JsonResponse errorTokenMsg(String msg) {
        return new JsonResponse(502, msg, null);
    }

    public static JsonResponse errorException(String msg) {
        return new JsonResponse(555, msg, null);
    }

    public static JsonResponse errorUserQQ(String msg) {
        return new JsonResponse(556, msg, null);
    }

    public JsonResponse(Object data) {
        this.status = 200;
        this.message = "OK";
        this.data = data;
    }

    public Boolean isOK() {
        return this.status == 200;
    }
}

...
[INFO] expensive-shop ..................................... SUCCESS [  1.220 s]
[INFO] mscx-shop-common ................................... SUCCESS [  9.440 s]
[INFO] mscx-shop-pojo ..................................... SUCCESS [  2.020 s]
[INFO] mscx-shop-mapper ................................... SUCCESS [  1.564 s]
[INFO] mscx-shop-service .................................. SUCCESS [  1.366 s]
[INFO] mscx-shop-api ...................................... SUCCESS [  4.614 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  20.739 s
[INFO] Finished at: 2019-11-06T14:53:55+08:00
[INFO] ------------------------------------------------------------------------