Java日记02

业务接口开发流程

以分类接口category为例

• 实现类Category
• Mapper接口CategoryMapper
• 业务层接口CategoryService
• 业务层实现类CategoryServiceImpl
• 控制层Categoryontroller

// Category.java
/**
 * 分类
 */
@Data
public class Category implements Serializable {
    private static final long serialVersionUID = 1L;
    private Long id;
    //类型 1 菜品分类 2 套餐分类
    private Integer type;
    //分类名称
    private String name;
    //顺序
    private Integer sort;
    //创建时间
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    //更新时间
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
    //创建人
    @TableField(fill = FieldFill.INSERT)
    private Long createUser;
    //修改人
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Long updateUser;
}

// CategoryMapper.java
@Mapper
public interface CategoryMapper extends BaseMapper<Category> {
}

// CategoryService.java
public interface CategoryService extends IService<Category> {
}

// CategoryServiceImpl.java
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
}

// CategoryController.java
/**
 * 分类管理
 */
@RestController
@RequestMapping("/category")
public class CategoryController {
    @Autowired
    private CategoryService categoryService;
}

进入开发

新增功能

// CategoryController.java
@RestController
@RequestMapping("/category")
@Slf4j
public class CategoryController {
    @Autowired
    private CategoryService categoryService;

    @PostMapping
    public R<String> save(@RequestBody Category category) {
        log.info("category: {}", category);
        categoryService.save(category);
        return R.success("新增菜品成功");
    }
}

查询功能

// CategoryController.java
@GetMapping("/page")
public R<Page> page(int page, int pageSize) {
    // 分页构造器
    Page<Category> pageInfo = new Page<>(page, pageSize);
    // 条件构造器
    LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();
    // 添加排序条件，根据sort进行排序
    queryWrapper.orderByAsc(Category::getSort);
    // 进行分页查询
    categoryService.page(pageInfo, queryWrapper);
    return R.success(pageInfo);
}