导入依赖：

<!--easypoi 导入导出 -->
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-base</artifactId>
    <version>4.2.0</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-web</artifactId>
    <version>4.2.0</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-annotation</artifactId>
    <version>4.2.0</version>
</dependency>

主表

package com.diye.cloud.project.modular.competition.vo;

import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelCollection;
import lombok.Data;

import java.math.BigDecimal;
import java.util.Date;
import java.util.List;

/**
 * 导出送出培训信息接收类(主表)
 * 2022年7月26日09:16:43
 * 张小辉
 */

@Data
public class CmpInfoExportVo {


    private String id;

    @Excel(name="培训性质",needMerge = true,replace = {"计划内_0","计划外_1"},width = 20)
    private String planProperties;

    @Excel(name="类别",needMerge = true,replace = {"国网_0","省专业部门_1","系统外_2"},width = 20)
    private String projectType;

    @Excel(name="培训班名称",needMerge = true,width = 30)
    private String className;

    @Excel(name="开始时间" , format = "yyyy-MM-dd",needMerge = true,width = 20)
    private Date planStartTime;

    @Excel(name="结束时间" , format = "yyyy-MM-dd",needMerge = true,width = 20)
    private Date planEndTime;


    @Excel(name="培训地点",needMerge = true,width = 20)
    private String address;

    @Excel(name="培训天数",needMerge = true,width = 20)
    private Integer planDays;

    @Excel(name="费用标准",needMerge = true,width = 20)
    private BigDecimal bidPrice;

    @Excel(name="总人数",needMerge = true,width = 20)
    private Integer peopleNum;

    @ExcelCollection(name = "")
    private List<StudentInfoExportVo> students;

}

子表

package com.diye.cloud.project.modular.competition.vo;


import cn.afterturn.easypoi.excel.annotation.Excel;
import lombok.Data;

/**
 * 导出送出培训-学生信息接收类（子表）
 * 2022年7月26日09:24:20
 * 张小辉
 */
@Data
public class StudentInfoExportVo {
    @Excel(name="参培单位",width = 20)
    private String companyName;
    @Excel(name="参培部门",width = 20)
    private String deptName;
    @Excel(name="姓名",width = 20)
    private String name;
    @Excel(name="学历",width = 20)
    private String education;
    @Excel(name="职务",width = 20)
    private String post;
    @Excel(name="岗位",width = 20)
    private String station;
    @Excel(name="技术等级",width = 20)
    private String technicalLevel;
    @Excel(name="技能等级",width = 20)
    private String skillLevel;

}

controller

```java
 @SneakyThrows
    @PostResource(name = "根据条件查询导出", path = "/exportExcel", requiredPermission = false)
    @ApiOperation(value = "根据条件查询导出")
    public void exportExcel(@RequestBody CmpParam param,
                            HttpServletResponse response) {
        param = buildCmpParam(param);
        List<CmpInfoExportVo> exportList = cmpService.getExportList(param);
        List<StudentInfoExportVo> studentList = new ArrayList<>();
        for (CmpInfoExportVo cmpInfoExportVo : exportList) {
            //根据id去查询学员
            studentList = cmpStudentMaterialsService.getExportList(cmpInfoExportVo.getId());
            cmpInfoExportVo.setStudents(studentList);
            Integer peopleNum = cmpService.getPeopleNumber(cmpInfoExportVo.getId());
            if(ToolUtil.isNotEmpty(peopleNum)){
                cmpInfoExportVo.setPeopleNum(peopleNum);
            }else{
                cmpInfoExportVo.setPeopleNum(0);
            }
        }
        // 简单模板导出方法
        ExportParams params = new ExportParams();
        params.setSheetName("送出培训");//设置sheet名
        Workbook workbook = ExcelExportUtil.exportExcel(params, CmpInfoExportVo.class, exportList);
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" +
                    URLEncoder.encode("送出培训导出", "UTF-8"));
            OutputStream ouputStream = response.getOutputStream();
            workbook.write(ouputStream);
            ouputStream.flush();
            ouputStream.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

![在这里插入图片描述](https://img-blog.csdnimg.cn/04ac9dd2eb154c1ba061afece79378a5.png)
同时可参考easypoi一对多复杂导入：https://blog.csdn.net/qq_26144365/article/details/126947292