=============
后端_分类列表
=============

首页------>编辑页------>发布页
    写文章        发布

发布页：

 ____________________________
| 摘要/分类/标签            X|
|----------------------------|
|  ________________________  |
| |                        | |
| |                        | |
| |                        | |
| |        文章摘要        | |
| |                        | |
| |                        | |
| |________________________| |
|           _______________  |
| 文章分类 |              V|---> 分类列表
|          |_______________| |
|           ___   ___   ___  |
| 文章标签 |x  | |x  | |x  |---> 标签列表
|          |___| |___| |___| |
|           ______   ______  |
|          | 取消 | | 发布 |---> 发布文章
|          |______| |______| |
|____________________________|

1 分类服务

1.1 分类服务接口

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/CategoryService.java：

public interface CategoryService {
    ...
    /**
     * 查询分类列表
     */
    public Result list();
    ...
}

1.2 分类服务实现

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/impl/CategoryServiceImpl.java：

...
public class CategoryServiceImpl implements CategoryService {
    ...
    @Override
    public Result list() {
        List<Category> categories = categoryMapper.selectList(
            new LambdaQueryWrapper<Category>());
        return Result.success(copyList(categories));
    }

    private List<CategoryVo> copyList(List<Category> categories) {
        List<CategoryVo> categoryVos = new ArrayList<>();
        for (Category category: categories)
            categoryVos.add(copy(category));
        return categoryVos;
    }

    private CategoryVo copy(Category category) {
        CategoryVo categoryVo = new CategoryVo();
        BeanUtils.copyProperties(category, categoryVo);
        return categoryVo;
    }
    ...
}

2 分类控制器

/ysdblog-api/src/main/java/com/weihome/ysdblog/controller/CategoryController.java：

@RestController
@RequestMapping("category")
public class CategoryController {
    @Autowired
    private CategoryService categoryService;
    /**
     * 查询分类列表
     */
    @GetMapping("list")
    public Result list() {
        return categoryService.list();
    }
}

3 运行测试

Postman
    GET
        localhost:8888/category/list
------------------------------------
{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": [
        {
            "id": 1,
            "avatar": "category_a.png",
            "categoryName": "category_a"
        },
        {
            "id": 2,
            "avatar": "category_b.png",
            "categoryName": "category_b"
        },
        {
            "id": 3,
            "avatar": "category_c.png",
            "categoryName": "category_c"
        },
        {
            "id": 4,
            "avatar": "category_d.png",
            "categoryName": "category_d"
        },
        {
            "id": 5,
            "avatar": "category_e.png",
            "categoryName": "category_e"
        }
    ]
}