秒杀第四节：使用springMVC方式开发用户信息

新建service、impl、model目录。

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在UserPasswordDOMapper新增方法。

UserPasswordDO selectByUserId(Integer userId);

在UserPasswordDOMapper.xml新增如下代码：

<select id="selectByUserId" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from user_password
    where user_id = #{id,jdbcType=INTEGER}
  </select>

创建UserModel

@Data
public class UserModel {
    private Integer id;
    private String name;
    private Byte gender;
    private Integer age;
    private String telphone;
    private String registerMode;
    private String thirdPartyId;
    private String encrptPassword;
}

如果@Data报错，请在pom文件引入lombok依赖

<dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.4</version>
    </dependency>

创建UserService

public interface UserService {
    //通过对象id获取对象
    UserModel getUserById(Integer id);
}

UserServiceImpl

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDOMapper userDOMapper;
    @Autowired
    private UserPasswordDOMapper userPasswordDOMapper;

    //为什么不直接返回
    @Override
    public UserModel getUserById(Integer id) {
        //调用userdomapper获取到dataobject
        UserDO userDO = userDOMapper.selectByPrimaryKey(id);
        if (userDO == null) {
            return null;
        }
        //通过用户id获取用户加密密码信息
        UserPasswordDO userPasswordDO = userPasswordDOMapper.selectByUserId(userDO.getId());
        return convertFromDataObject(userDO, userPasswordDO);
    }

    private UserModel convertFromDataObject(UserDO userDO, UserPasswordDO userPasswordDO) {
        if (userDO == null) {
            return null;
        }
        UserModel userModel = new UserModel();
        BeanUtils.copyProperties(userDO, userModel);
        if (userPasswordDO != null) {
            userModel.setEncrptPassword(userPasswordDO.getEncrptPassword());
        }
        return userModel;
    }
}

创建controller和返回对象目录viewobject
创建返回对象UserVo

@Data
public class UserVo {
    private Integer id;
    private String name;
    private Byte gender;
    private Integer age;
    private String telphone;
}

创建UserController

@RestController
@RequestMapping("/user")
public class UserController {
    
    @Autowired
    private UserService userService;

    @RequestMapping("/get")
    public UserVo getUser(@RequestParam(name = "id") Integer id){
        //调用service服务获取对应id对象返回给前端
        UserModel userModel = userService.getUserById(id);
        //将核心领域模型用户对象转换为可供UI使用的viewobject
        UserVo userVo = convertFromMode(userModel);
        return userVo;
    }

    private UserVo convertFromMode(UserModel userModel) {
        if (userModel == null) {
            return null;
        }
        UserVo userVo = new UserVo();
        BeanUtils.copyProperties(userModel, userVo);
        return userVo;
    }
}

请求地址：http://localhost:8080/user/get?id=6
返回值：{"id":6,"name":"test","gender":1,"age":22,"telphone":"12312312311"}