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。
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