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Springboot 导入导出Excel ,一对多关系,复合表格、合并单元格数据

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。

标签: java springboot excel

本文转载自: https://blog.csdn.net/qq_35387940/article/details/125953667
版权归原作者 小目标青年 所有, 如有侵权,请联系我们删除。

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