feat(新增): 读取和写入Excel表

Signed-off-by: bunny <1319900154@qq.com>

spzx-manager/src/main/java/com/atguigu/spzx/manger/excel/CategoryExcelListener.java

@@ -0,0 +1,46 @@
+package com.atguigu.spzx.manger.excel;
+
+import com.alibaba.excel.context.AnalysisContext;
+import com.alibaba.excel.event.AnalysisEventListener;
+import com.alibaba.excel.util.ListUtils;
+import com.atguigu.spzx.manger.mapper.CategoryMapper;
+import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.RequiredArgsConstructor;
+
+import java.util.List;
+
+@EqualsAndHashCode(callSuper = true)
+@Data
+@RequiredArgsConstructor
+public class CategoryExcelListener<T> extends AnalysisEventListener<T> {
+    // 每个5条存储数据库，方便垃圾回收
+    private static final int BATCH_COUNT = 100;
+    // 缓存的数据
+    private final List<CategoryExcelVo> cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
+    private CategoryMapper categoryMapper;
+
+    @Override
+    public void invoke(T t, AnalysisContext analysisContext) {
+        CategoryExcelVo data = (CategoryExcelVo) t;
+        cachedDataList.add(data);
+        if (cachedDataList.size() >= BATCH_COUNT) {
+            saveData();
+        }
+    }
+
+    @Override
+    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
+        // excel解析完毕以后需要执行的代码
+        // 这里也要保存数据，确保最后遗留的数据也存储到数据库
+        saveData();
+    }
+
+    /**
+     * 写入数据库
+     */
+    private void saveData() {
+        categoryMapper.batchInsert(cachedDataList);
+    }
+}

spzx-manager/src/main/java/com/atguigu/spzx/manger/excel/ExcelListener.java

@@ -1,4 +1,4 @@
-package com.atguigu.excel;
+package com.atguigu.spzx.manger.excel;
 
 import com.alibaba.excel.context.AnalysisContext;
 import com.alibaba.excel.event.AnalysisEventListener;

spzx-manager/src/main/java/com/atguigu/spzx/manger/mapper/CategoryMapper.java

@@ -1,6 +1,7 @@
 package com.atguigu.spzx.manger.mapper;
 
 import com.atguigu.spzx.model.entity.product.Category;
+import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
 import org.apache.ibatis.annotations.Mapper;
 
 import java.util.List;
@@ -22,4 +23,18 @@ public interface CategoryMapper {
      * @return int
      */
     int countByParentId(Long id);
+
+    /**
+     * 读取所以分类数据
+     *
+     * @return 分类实体类列表
+     */
+    List<Category> selectAll();
+
+    /**
+     * 批量插入数据库
+     *
+     * @param cachedDataList Excel表品牌管理实体类
+     */
+    void batchInsert(List<CategoryExcelVo> cachedDataList);
 }

spzx-manager/src/main/java/com/atguigu/spzx/manger/service/impl/CategoryServiceImpl.java

@@ -1,11 +1,15 @@
 package com.atguigu.spzx.manger.service.impl;
 
 import com.alibaba.excel.EasyExcel;
+import com.atguigu.exception.BunnyException;
+import com.atguigu.spzx.manger.excel.ExcelListener;
 import com.atguigu.spzx.manger.mapper.CategoryMapper;
 import com.atguigu.spzx.manger.service.CategoryService;
 import com.atguigu.spzx.model.entity.product.Category;
 import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
+import com.atguigu.spzx.model.vo.result.ResultCodeEnum;
 import jakarta.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -19,6 +23,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 @Service
+@Slf4j
 public class CategoryServiceImpl implements CategoryService {
     @Autowired
     private CategoryMapper categoryMapper;
@@ -50,7 +55,29 @@ public class CategoryServiceImpl implements CategoryService {
      */
     @Override
     public void exportData(HttpServletResponse response) {
-        // TODO 导出数据
+        // 设置响应结果类型
+        response.setContentType("application/vnd.ms-excel");
+        response.setCharacterEncoding("utf-8");
+        // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
+        String filename = URLEncoder.encode("分类数据", StandardCharsets.UTF_8);
+        response.setHeader("Content-disposition", "attachment;filename=" + filename + ".xlsx");
+        // 查询数据库中的数据
+        List<Category> categoryList = categoryMapper.selectAll();
+        ArrayList<CategoryExcelVo> excelVoArrayList = new ArrayList<>();
+        // 将从数据库中查询到的Category对象转换成CategoryExcelVo对象
+        categoryList.forEach(category -> {
+            CategoryExcelVo vo = new CategoryExcelVo();
+            BeanUtils.copyProperties(category, vo, CategoryExcelVo.class);
+            excelVoArrayList.add(vo);
+        });
+
+        try {
+            // 写入文件
+            EasyExcel.write(response.getOutputStream(), CategoryExcelVo.class).sheet("分类数据").doWrite(excelVoArrayList);
+        } catch (IOException exception) {
+            log.error("文件写入失败：{}", exception.getMessage());
+            throw new BunnyException(ResultCodeEnum.WRITE_FILE_ERROR);
+        }
     }
 
     /**
@@ -60,6 +87,13 @@ public class CategoryServiceImpl implements CategoryService {
      */
     @Override
     public void importData(MultipartFile file) {
-        // TODO 导入功能
+        // 创建监听器对象，传递mapper对象
+        ExcelListener<CategoryExcelVo> listener = new ExcelListener<>();
+        // 调用read方法读取excel数据
+        try {
+            EasyExcel.read(file.getInputStream(), CategoryExcelVo.class, listener).sheet().doRead();
+        } catch (IOException e) {
+            throw new BunnyException(ResultCodeEnum.DATA_ERROR);
+        }
     }
 }

spzx-manager/src/main/resources/mapper/CategoryMapper.xml

@@ -8,6 +8,17 @@
         id,name,image_url,parent_id,status,order_num,create_time,update_time,is_deleted
     </sql>
 
+    <!-- 批量插入数据库 -->
+    <insert id="batchInsert">
+        insert into category (id, name, image_url, parent_id, status, order_num, create_time, update_time, is_deleted)
+        values
+        <foreach collection="cachedDataList" item="item" separator=",">
+            (#{item.id}, #{item.name}, #{item.image_url}, #{item.parent_id}, #{item.status}, #{item.order_num},
+            #{item.create_time}, #{item.update_time},
+            #{item.is_deleted})
+        </foreach>
+    </insert>
+
     <!-- 根据分类id查询它下面的所有的子分类数据 -->
     <select id="selectByParentId" resultType="com.atguigu.spzx.model.entity.product.Category">
         select
@@ -23,4 +34,13 @@
         where parent_id = #{id}
           and is_deleted = 0
     </select>
+
+    <!-- 读取所以分类数据 -->
+    <select id="selectAll" resultType="com.atguigu.spzx.model.entity.product.Category">
+        select
+        <include refid="columns"/>
+        from category
+        where is_deleted = 0
+        order by id desc
+    </select>
 </mapper>

spzx-manager/src/test/java/com/atguigu/spzx/manger/EasyExcelTest.java

@@ -1,7 +1,7 @@
 package com.atguigu.spzx.manger;
 
 import com.alibaba.excel.EasyExcel;
-import com.atguigu.excel.ExcelListener;
+import com.atguigu.spzx.manger.excel.ExcelListener;
 import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;

spzx-model/src/main/java/com/atguigu/spzx/model/entity/product/Category.java

@@ -3,13 +3,14 @@ package com.atguigu.spzx.model.entity.product;
 import com.atguigu.spzx.model.entity.base.BaseEntity;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
+import lombok.EqualsAndHashCode;
 
 import java.util.List;
 
+@EqualsAndHashCode(callSuper = true)
 @Data
 @Schema(description = "分类实体类")
 public class Category extends BaseEntity {
-
     @Schema(description = "分类名称")
     private String name;
 
@@ -30,5 +31,4 @@ public class Category extends BaseEntity {
 
     @Schema(description = "子节点List集合")
     private List<Category> children;
-
 }

spzx-model/src/main/java/com/atguigu/spzx/model/vo/product/CategoryExcelVo.java

@@ -1,6 +1,7 @@
 package com.atguigu.spzx.model.vo.product;
 
 import com.alibaba.excel.annotation.ExcelProperty;
+import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
@@ -8,24 +9,23 @@ import lombok.NoArgsConstructor;
 @Data
 @AllArgsConstructor
 @NoArgsConstructor
+@Schema(description = "Excel表品牌管理实体类")
 public class CategoryExcelVo {
-
-	@ExcelProperty(value = "id" ,index = 0)
+    @ExcelProperty(value = "id", index = 0)
     private Long id;
 
-	@ExcelProperty(value = "名称" ,index = 1)
+    @ExcelProperty(value = "名称", index = 1)
     private String name;
 
-	@ExcelProperty(value = "图片url" ,index = 2)
-	private String imageUrl ;
+    @ExcelProperty(value = "图片url", index = 2)
+    private String imageUrl;
 
-	@ExcelProperty(value = "上级id" ,index = 3)
+    @ExcelProperty(value = "上级id", index = 3)
     private Long parentId;
 
-	@ExcelProperty(value = "状态" ,index = 4)
+    @ExcelProperty(value = "状态", index = 4)
     private Integer status;
 
-	@ExcelProperty(value = "排序" ,index = 5)
+    @ExcelProperty(value = "排序", index = 5)
     private Integer orderNum;
-
 }

spzx-model/src/main/java/com/atguigu/spzx/model/vo/result/ResultCodeEnum.java

@@ -8,15 +8,16 @@ import lombok.Getter;
 @Getter
 public enum ResultCodeEnum {
     SUCCESS(200, "成功"),
+    PERMISSION(401, "没有权限"),
     FAIL(500, "失败"),
     USE_NOT_EXIST(500, "失败"),
-    SERVICE_ERROR(2012, "服务异常"),
-    DATA_ERROR(204, "数据异常"),
-    LOGIN_AUTH(208, "需要先登陆"),
-    LOGIN_MOBLE_ERROR(208, "登录验证失败"),
-    ACCOUNT_DEACTIVATION(208, "账户停用"),
-    PERMISSION(209, "没有权限"),
+    SERVICE_ERROR(500, "服务异常"),
+    DATA_ERROR(500, "数据异常"),
+    LOGIN_AUTH(500, "需要先登陆"),
+    LOGIN_MOBLE_ERROR(500, "登录验证失败"),
+    ACCOUNT_DEACTIVATION(500, "账户停用"),
     USERNAME_IS_EXISTS(500, "用户名已存在"),
+    WRITE_FILE_ERROR(500, "写入文件失败"),
     ;
 
     private final Integer code;