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仲灏
2022-04-09
目录

springboot项目学习笔记4 商品模块

# 商品模块介绍

后台

  • 新增商品
    • 图片上传
  • 更新商品
  • 删除商品
  • 批量上下架操作
  • 商品列表

前台

  • 商品列表

    • 分类

    • 排序价格

  • 商品详情

# 添加商品

  • # 添加后台商品管理controller

    @RestController 相当于在每个方法上都加了@ResponseBody

    package com.izhaong.mall.contraoller;
...
@RestController
public class ProductAdminController {

    @Autowired
    ProductService productService;
  
		@PostMapping("/admin/product/add")
    public ApiRestResponse addProduct(@Valid @RequestBody AddProductReq addProductReq) {
        productService.add(addProductReq);
        return ApiRestResponse.success();
    }
}
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  • # 新增商品实体类 自定义在model request

    • 添加校验

      package com.izhaong.mall.model.request;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;

public class AddProductReq {
    @NotNull(message = "商品名称不能为null")
    private String name;

    @NotNull(message = "商品图片不能为null")

    private String image;

    private String detail;

    @NotNull(message = "商品分类不能为null")
    private Integer categoryId;

    @NotNull(message = "商品价格不能为null")
    @Min(value = 1,message = "价格不能小于1")
    private Integer price;

    @NotNull(message = "商品库存不能为null")
    @Max(value = 10000,message = "库存不能大于10000")
    private Integer stock;

    private Integer status;
		...	getter&setter
}
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  • # 建立商品service

    • 接口

      package com.izhaong.mall.service;

import com.github.pagehelper.PageInfo;
import com.izhaong.mall.model.pojo.Product;
import com.izhaong.mall.model.request.AddProductReq;
import com.izhaong.mall.model.vo.CategoryVO;

import java.util.List;

public interface ProductService {
    void add(AddProductReq addProductReq);

    void update(Product product);

    void delete(Integer id);

    PageInfo listForAdmin(Integer pageNum, Integer pageSize);

    List<CategoryVO> listForCustomer();
}
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    • 实现类

      package com.izhaong.mall.service.impl;
...
@Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    ProductMapper productMapper;

    @Override
    public void add(AddProductReq addProductReq) {
        Product product = new Product();
        BeanUtils.copyProperties(addProductReq, product);
        // 重名情况处理

    }

    @Override
    public void update(Product product) {

    }

    @Override
    public void delete(Integer id) {

    }

    @Override
    public PageInfo listForAdmin(Integer pageNum, Integer pageSize) {
        return null;
    }

    @Override
    public List<CategoryVO> listForCustomer() {
        return null;
    }
}
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      • 重名情况处理：

        • 根据name查询, 新增mapper

          package com.izhaong.mall.model.dao;
...
public interface ProductMapper {
	...
  Product selectByPrimaryKey(Integer id);
  Product selectByName(String name);
  ...
}
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            ...
	<select id="selectByName" parameterType="java.lang.String" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from imooc_mall_product
    where name = #{name,jdbcType=VARCHAR}
  </select>
	...
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        • 如果有抛出异常，否则就插入

          @Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    ProductMapper productMapper;

    @Override
    public void add(AddProductReq addProductReq) {
        Product product = new Product();
        BeanUtils.copyProperties(addProductReq, product);
        // 重名情况处理
        Product productOld = productMapper.selectByName(addProductReq.getName());
        if(productOld != null) {
            throw new MallException(MallExceptionEnum.NAME_EXISTED);
        }
        int count = productMapper.insertSelective(product);
        if(count == 0) {
            throw new MallException(MallExceptionEnum.INSERT_FAILED);
        }
    }
  ...
}
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# UUID介绍

  • 文件名UUID
  • 通用唯一识别码(Universally Unique Identifier )
  • 防止重名、防止爬图
  • 生成规则：日期和时间、MAC地址、HashCode、随机数

# 图片上传

  • # 重命名上传文件

        @PostMapping("/admin/upload/file")
    public ApiRestResponse upload (HttpServletRequest httpServletRequest, @RequestParam("file")MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String suffixName = fileName.substring(fileName.lastIndexOf("."));

        UUID uuid = UUID.randomUUID();
        String newFileName = uuid.toString() + suffixName;

				...
    }
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  • # 创建文件

    • 文件夹路径为配置变量

      package com.imooc.mall.common;
...
public class Constant {
    ...
  	public static String FILE_UPLOAD_DIR;

    @Value("${file.upload.dir}")
    public void setFileUploadDir(String fileUploadDir) {
        FILE_UPLOAD_DIR = fileUploadDir;
    }
    ...
}
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      • 文件夹吐过没有则创建， 对创建失败的情况做处理

               //如果文件夹不存在
        if (!fileDirectory.exists()) {
            if (!fileDirectory.mkdir()) {
                throw new MallException(MallExceptionEnum.MKDIR_FAILED);
            }
        }
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    • 写入空文件中

              try {
            file.transferTo(destFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
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    • 返回地址

      • 获取本地服务地址

            private URI getHost(URI uri) {
        URI effectiveURI;
        try {
            effectiveURI = new URI(uri.getScheme(), uri.getUserInfo(), uri.getHost(), uri.getPort(),
                    null, null, null);
        } catch (URISyntaxException e) {
            effectiveURI = null;
        }
        return effectiveURI;
    }
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      • 拼接地址，对失败做处理

                try {
            return ApiRestResponse
                    .success(getHost(new URI(httpServletRequest.getRequestURL() + "")) + "/images/"
                            + newFileName);
        } catch (URISyntaxException e) {
            return ApiRestResponse.error(MallExceptionEnum.UPLOAD_FAILED);
        }
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# 自定义静态资源映射目录

  • 上传图片后回显
  • 配置SpringBootWebMvcConfig
  • 静态资源到本地目录映射
  • 演示打开图片

# 更新商品

# model UpdateProductReq

​ 一定要生成id和name的 getter和setter方法，在controller会用到id的get方法，在service实现类中用到了name的get方法

public class UpdateProductReq {
    @NotNull(message = "id不能为空")
    private Integer id;

    private String name;

    private String image;

    private String detail;

    private Integer categoryId;

    @Min(value = 1, message = "价格不能小于1")
    private Integer price;

    @Max(value = 10000, message = "库存不能大于10000")
    private Integer stock;

    private Integer status;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}
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# controller

    @PutMapping("/admin/product/update")
    public ApiRestResponse update(UpdateProductReq upProduct) {
        Product product = new Product();
        BeanUtils.copyProperties(upProduct, product);
        productService.update(product);
        return ApiRestResponse.success();
    }
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# service

  • 同名且不同id

        @Override
    public void update(Product product) {
//        同名且不同id
        Product productOld = productMapper.selectByName(product.getName());
        if (productOld != null && !(productOld.getId().equals(product.getId()))) {
            throw new MallException(MallExceptionEnum.NAME_EXISTED);
        }
        int count = productMapper.updateByPrimaryKeySelective(product);
        if (count == 0) {
            throw new MallException(MallExceptionEnum.UPDATE_FAILD);
        }
    }
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# 删除商品

controller

    @DeleteMapping("/admin/product/delete")
    public ApiRestResponse delete(int id) {
        productService.delete(id);
        return ApiRestResponse.success();
    }
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service

    @Override
    public void delete(Integer id) {
        Product product = productMapper.selectByPrimaryKey(id);
        if (product == null) {
            throw new MallException(MallExceptionEnum.UPDATE_FAILD);
        }
        int count = productMapper.deleteByPrimaryKey(id);
        if (count == 0) {
            throw new MallException(MallExceptionEnum.DELETE_FAILED);
        }
    }
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# 批量上下架

  • mybatis 遍历list
  • where 语句拼接

# mapper

跟mybatis相关需要加入注解的名字@Param

    int batchUpdateSellStatus(@Param("ids") Integer[] ids, @Param("status") Integer status);
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sql mapper

    <update id="batchUpdateSellStatus">
        update imooc_mall_product
        set status = #{status}
        where id in
        <foreach collection="ids" open="(" close=")" item="id" separator=",">
            #{id}
        </foreach>
    </update>
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# SQL理解

  • 使用mysql 自带的语句构建批量更新

    UPDATE tableName
    SET orderId = CASE id 
        WHEN 1 THEN 3 
        WHEN 2 THEN 4 
        WHEN 3 THEN 5 
    END
WHERE id IN (1,2,3)
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更新多个值的话

UPDATE categories 
    SET orderId = CASE id 
        WHEN 1 THEN 3 
        WHEN 2 THEN 4 
        WHEN 3 THEN 5 
    END, 
    title = CASE id 
        WHEN 1 THEN 'New Title 1'
        WHEN 2 THEN 'New Title 2'
        WHEN 3 THEN 'New Title 3'
    END
WHERE id IN (1,2,3)
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# 商品列表

  • 排序功能
  • mybatis pagehelper
  • 枚举：order by

# service

  • 新建req类
  • 新建query类
上次更新: 2022/06/05, 20:31:36
springboot项目学习笔记3 分类模块
springboot项目学习笔记6 订单模块

← springboot项目学习笔记6 订单模块→

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