前言
学习是自己的事。
但是跟着我学习,也未尝不可。
这种一对多的导出需求,好像确实也是比较常见的:
表面拒绝,反手上演一手实战示例。
内容:
① 一对多关系数据 (合并单元格)数据的 导出
②一对多关系数据 (合并单元格)数据的 导入
导入导出一块给整了,直接杀死比赛。
(看官们,收藏起来,以后备用。顺手给我点个赞。)
之前写过一篇极其简单的excel导入导出,是单个文件的:
Springboot 最简单的结合MYSQL数据实现EXCEL表格导出及数据导入_小目标青年的博客-CSDN博客
还写过一篇单个,多个 excel文件导出,转成ZIP包的:
SpringBoot 导出多个Excel文件,压缩成.zip格式下载_小目标青年的博客-CSDN博客
还有指定模板导出的:
Springboot 指定自定义模板导出Excel文件_小目标青年的博客-CSDN博客_自定义导出excel
正文
模拟一个这种数据的业务场景:
效果,数据导出:
实战:
先看看工程目录结构:
pom.xml 引入核心依赖:
<dependencies> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-spring-boot-starter</artifactId> <version>4.1.3</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
这篇文章核心就是使用easypoi 的 注解
@Excel()
合并单元格、复合表格的关键注解
@ExcelCollection()
项目小组类
ProjectGroupExcelVO.java
import cn.afterturn.easypoi.excel.annotation.Excel; import cn.afterturn.easypoi.excel.annotation.ExcelCollection; import lombok.Data; import java.util.List; /** * @Author: JCccc * @Description: * @Date: 1/1/1 1:11 */ @Data public class ProjectGroupExcelVO { @Excel(name = "小组名称", needMerge = true, width = 20,height = 8) private String groupName; @Excel(name = "小组口号", needMerge = true, width = 20,height = 8) private String groupSlogan; @Excel(name = "小组类型", needMerge = true, width = 20,height = 8) private String groupType; @ExcelCollection(name = "组员信息") private List<GroupUserExcelVO> groupUsers; }
简析:
组员的类
GroupUserExcelVO.java
import cn.afterturn.easypoi.excel.annotation.Excel; import lombok.Data; /** * @Author: JCccc * @Description: * @Date: 1/1/1 1:11 */ @Data public class GroupUserExcelVO { @Excel(name = "组员名字", width = 20,height = 8) private String name; @Excel(name = "组员电话", width = 20,height = 8) private String phone; @Excel(name = "年龄", width = 20,height = 8) private Integer age; }
导入导出工具类一个
MyExcelUtils.java
import cn.afterturn.easypoi.excel.ExcelExportUtil; import cn.afterturn.easypoi.excel.ExcelImportUtil; import cn.afterturn.easypoi.excel.entity.ExportParams; import cn.afterturn.easypoi.excel.entity.ImportParams; import org.apache.poi.ss.usermodel.Workbook; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.net.URLEncoder; import java.util.List; import java.util.NoSuchElementException; /** * @Author: JCccc * @Description: * @Date: 1/1/1 1:11 */ public class MyExcelUtils { /** * 功能描述:复杂导出Excel,包括文件名以及表名,不创建表头 * * @param list 导出的实体类 * @param title 表头名称 * @param sheetName sheet表名 * @param pojoClass 映射的实体类 * @param fileName * @param response * @return */ public static void exportExcel( List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) { defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName)); } /** * 功能描述:默认导出方法 * * @param list 导出的实体集合 * @param fileName 导出的文件名 * @param pojoClass pojo实体 * @param exportParams ExportParams封装实体 * @param response * @return */ private static void defaultExport( List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) { Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list); if (workbook != null) { downLoadExcel(fileName, response, workbook); } } /** * 功能描述:Excel导出 * * @param fileName 文件名称 * @param response * @param workbook Excel对象 * @return */ private static void downLoadExcel( String fileName, HttpServletResponse response, Workbook workbook) { try { response.setCharacterEncoding("UTF-8"); response.setHeader("content-Type", "multipart/form-data"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); workbook.write(response.getOutputStream()); } catch (IOException e) { throw new RuntimeException(e); } } /** * 功能描述:根据接收的Excel文件来导入Excel,并封装成实体类 * * @param file 上传的文件 * @param titleRows 表标题的行数 * @param headerRows 表头行数 * @param pojoClass Excel实体类 * @return */ public static <T> List<T> importExcel( MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) { if (file == null) { return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); List<T> list = null; try { list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params); } catch (NoSuchElementException e) { throw new RuntimeException("excel文件不能为空"); } catch (Exception e) { throw new RuntimeException(e.getMessage()); } return list; } }
导出接口:
TestController.java
import com.jc.excel.excelVO.GroupUserExcelVO; import com.jc.excel.excelVO.ProjectGroupExcelVO; import com.jc.excel.util.MyExcelUtils; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletResponse; import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.util.ArrayList; import java.util.List; /** * @Author: JCccc * @Description: * @Date: 1/1/1 1:11 */ @RestController public class TestController { /** * excel导出 * * @return */ @GetMapping(value = "/exportTest") public void export(HttpServletResponse response) { List<ProjectGroupExcelVO> projectGroupList=new ArrayList<>(); //小组A数据模拟 ProjectGroupExcelVO groupA=new ProjectGroupExcelVO(); groupA.setGroupName("小组A"); groupA.setGroupSlogan("天天向上,爱学习!"); groupA.setGroupType("奋斗类型"); List<GroupUserExcelVO> groupUserAList=new ArrayList<>(); GroupUserExcelVO groupUser1=new GroupUserExcelVO(); groupUser1.setName("小收"); groupUser1.setPhone("123456"); groupUser1.setAge(18); GroupUserExcelVO groupUser2=new GroupUserExcelVO(); groupUser2.setName("小藏"); groupUser2.setPhone("654321"); groupUser2.setAge(20); groupUserAList.add(groupUser1); groupUserAList.add(groupUser2); groupA.setGroupUsers(groupUserAList); //小组B数据模拟 ProjectGroupExcelVO groupB=new ProjectGroupExcelVO(); groupB.setGroupName("小组B"); groupB.setGroupSlogan("跟着JC学java,稳!"); groupB.setGroupType("努力类型"); List<GroupUserExcelVO> groupBUserBList=new ArrayList<>(); GroupUserExcelVO groupUserB1=new GroupUserExcelVO(); groupUserB1.setName("小点"); groupUserB1.setPhone("123456"); groupUserB1.setAge(12); GroupUserExcelVO groupUserB2=new GroupUserExcelVO(); groupUserB2.setName("小赞"); groupUserB2.setPhone("654321"); groupUserB2.setAge(15); GroupUserExcelVO groupUserB3=new GroupUserExcelVO(); groupUserB3.setName("JCccc"); groupUserB3.setPhone("136919xxxxx"); groupUserB3.setAge(10000); groupBUserBList.add(groupUserB1); groupBUserBList.add(groupUserB2); groupBUserBList.add(groupUserB3); groupB.setGroupUsers(groupBUserBList); projectGroupList.add(groupA); projectGroupList.add(groupB); String time = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy_MM_dd_HH_mm_ss")); MyExcelUtils.exportExcel(projectGroupList, "小组信息", "小组信息", ProjectGroupExcelVO.class, "小组信息文件"+time+".xls",response); } }
调用一下看看导出的效果:
非常OK:
接下来是导入,写个简单接口玩一下:
数据:
导入 接口代码:
/** * excel导入 * * @return */ @PostMapping(value = "/importTest") public void importTest( @RequestParam("file") MultipartFile file) { List<ProjectGroupExcelVO> projectGroupExcelVOList = MyExcelUtils.importExcel(file, 1, 2, ProjectGroupExcelVO.class); System.out.println(projectGroupExcelVOList.toString()); System.out.println("-----------------------------------"); System.out.println("写入数据库"); }
调用看看效果:
导入成功,就是如此简单。