一般Excel不需要复杂的数据格式导出，只是在表头上略有区别，下面展示单行和多行表头Excel导出

1、单行表头

例如：Excel表头只有单行，那就只需要使用注解@ExcelProperty即可实现

① 添加依赖

首先，在 pom.xml 中添加 EasyExcel 的依赖：

 <!-- EasyExcel 依赖 -->
<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>3.3.3</version>
</dependency>

② 定义数据模型

在数据模型 EnergyTimeDetailVO需要导出的字段上添加注解信息@ExcelProperty

@Data
public class EnergyTimeDetailVO {
    @ApiModelProperty("时间")
    @ExcelProperty(value = "时间", index = 0)
    private String time;

    @ApiModelProperty("起始读数")
    @ExcelProperty(value = "起始读数", index = 1)
    private BigDecimal startRead;

    @ApiModelProperty("终止读数")
    @ExcelProperty(value = "终止读数", index = 2)
    private BigDecimal endRead;

    @ApiModelProperty("总用量")
    @ExcelProperty(value = "总用量", index = 3)
    private BigDecimal usage;
}

 ③ 编写导出逻辑

public class EasyExcelUtils {
    public static void downloadExcel(String fileName, String sheetName, Class clz, List list, HttpServletResponse response) throws IOException {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        fileName = URLEncoder.encode(fileName, "UTF-8");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName + ";" + "filename*=utf-8''" + fileName + ".xlsx");
        EasyExcel.write(response.getOutputStream(), clz)
                .sheet(sheetName)
                .registerWriteHandler(new CustomCellWriteWidthStrategy()) /*自适应列宽*/
                .registerWriteHandler(new CustomCellWriteHeightStrategy()) /*自适应行高*/
                .doWrite(list);
    }
}

自适应列宽CustomCellWriteWidthStrategy类和自适应行高CustomCellWriteHeightStrategy类，在这篇文章中：Java使用EasyExcel自定义合并（横纵合并）、自定义行高列宽、自适应行高列宽工具、自定义样式Excel导出_easyexcel 横向合并-CSDN博客

④ Excel导出

public void exportEnergyDetail(UseEnergyComparedMeterDTO param, HttpServletResponse response) {
        String fileName = "用能明细" + DateUtil.format(new Date(), DatePattern.PURE_DATE_FORMAT);
        try {
            List<EnergyTimeDetailVO> detailList = this.energyComparedDetail(param);
            EasyExcelUtils.downloadExcel(fileName, "数据明细", EnergyTimeDetailVO.class, detailList, response);
        } catch (Exception e) {
            log.error("用能明细:{}", e.getMessage());
        }
    }

⑤ 效果展示：

2、多行表头

如果数据标头为多行，如下方：

 就只需要要修改导出的类EnergyTimeDetailVO上的注解信息@ExcelProperty：

@Data
public class EnergyTimeDetailVO {
    @ApiModelProperty("时间")
    @ExcelProperty(value = "时间", index = 0)
    private String time;

    @ApiModelProperty("起始读数")
    @ExcelProperty(value = {"读数", "起始读数"}, index = 1)
    private BigDecimal startRead;

    @ApiModelProperty("终止读数")
    @ExcelProperty(value = {"读数", "终止读数"}, index = 2)
    private BigDecimal endRead;

    @ApiModelProperty("总用量")
    @ExcelProperty(value = "总用量", index = 3)
    private BigDecimal usage;
}

其他代码不变，撒花✿✿ヽ(°▽°)ノ✿，完结……

如果是动态表头，就是非固定表头的Excel可以参照这篇文章：

Java使用EasyExcel生成动态表头和多Sheet数据的Excel_easyexcel 动态表头和动态数据-CSDN博客