一、三层架构

经典的三层架构主要是Dao/Service/Controller层这三层. 相应的, 对应这3层的对象为DO/BO/VO对象.

PO: Persistant Object. 持久层对象. 类似数据库内的一条记录.
DO: Domain Object. 领域对象. 我们在三层架构中使用的DO其实是PO.
BO: Business Object. 业务对象.
VO: Value Object. 表现对象. 主要用于与前端直接的交互与信息传递.
DTO: Data Transfer Object. 通常是在OpenApi. 即此项目与其他外界项目交互时使用的对象

PS: 最后插一句. 其实, 如果你的项目功能足够简单. 项目比较小的话, 其实没有必要分的那么细致. 掌握设计的“度”, 非常重要.

二、阿里开发手册的部分

Domain对象的约定

Request和Response对象的约定

即复杂对象的交互必须封装成Request 和 Response与前端进行交互。

三、项目组成

四、相关项目&实战

Application

@SpringBootApplication
public class Application {

    public static void main(String []args){
        new SpringApplication().run(args);
    }

}

UserDaoImpl

/**
* UserDao 层.
* Author: sean
* Date:May 24, 202112:41:46 AM
*/
@Configuration
public class UserDaoImpl implements IUserDao{

    public UserDO getByName(String name) {
        return new UserDO();
    }
}

UserServiceImpl

@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    private IUserDao userDao;

    public UserBO getByName(String name) {
        UserDO userDO = userDao.getByName("");
        // transfer  userDO --> userBO
        return new UserBO();
    }
}

UserController

/**
* Base Controller.
* Author: sean
* Date:May 24, 202112:42:24 AM
*/

@RestController(value="/user")
public class UserController {

    @Autowired
    private IUserService userService;
    
        @RequestMapping(path = "getByName", method = RequestMethod.GET)
    public CommonResponse<UserVO> getByName(String name){
        UserBO userBO = userService.getByName("");
        // transfet userBO --> userVO --> CommonResponse
        UserVO userVO = new UserVO();
        return new CommonResponse(userVO).success();
    }
}

CommonResponse

/**
* 通用返回值封装.
* 
* Author: sean
* Date:May 24, 202112:35:18 AM
* @param <T>
*/
@Data
public class CommonResponse<T> {
    
    String description;
    
    String code;
    
    T data;

    public CommonResponse(T data){
        this.data = data;
    }

    public CommonResponse<T> success(){
        this.code = "200";
        this.description = "success";
        return this;
    }

    public CommonResponse<T> error(){
        this.code = "400";
        this.description = "error";
        return this;
    }
}

完整项目. 欢迎访问github: springboot-sophle/springboot-standard at main · SeanYanxml/springboot-sophle · GitHub

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