需要的依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>2.1.6</version>
 </dependency>

 <dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml</artifactId>
     <version>3.17</version>
 </dependency>

 <dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml-schemas</artifactId>
     <version>3.17</version>
 </dependency>

 <dependency>
     <groupId>org.apche.poi</groupId>
     <artifactId>poi</artifactId>
     <version>3.17</version>
 </dependency>

代码，根据使用的类型和list导出

public ResponseEntity promotionMonitorListDownload(PromotionMonitorQueryDTO queryDTO) {
    UserDTO currentUser = UserDTO.getCurrentUser();
    try {
        List<PromotionMonitorExcalInfo> list = promotionMonitorVOService.promotionMonitorListExcalDownload(currentUser, queryDTO);
        Integer todayInt = ZonedDateUtil.todayInt(ZonedDateUtil.TIMEZONE_ASIN_SHANGHAI);
        String fileName = new StringBuilder().append("deals管理_").append(todayInt).toString();
        return buildExportResponse(fileName,PromotionMonitorExcalInfo.class,list);
    } catch (Exception e) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(ResultBean.fail("系统错误"));
    }

}


 //excal导出
    private <T> ResponseEntity buildExportResponse(String fileName, Class<T> clazz, List<T> list) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        EasyExcel.write(outputStream,clazz).excelType(ExcelTypeEnum.XLSX).sheet(fileName).doWrite(list);
        String contentDisposition = "attachment;filename=".concat(URLEncoder.encode(fileName, "UTF-8")).concat(".xlsx");
        Resource resource = genResource(outputStream);
        return ResponseEntity.status(HttpStatus.OK)
                .header(HttpHeaders.CONTENT_DISPOSITION, contentDisposition)
                .header(HttpHeaders.CONTENT_LENGTH, String.valueOf(resource.contentLength()))
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .body(resource);
    }

    private Resource genResource(ByteArrayOutputStream outputStream) {
        Resource resource = null;
        try {
            resource = new ByteArrayResource(outputStream.toByteArray());
        } finally {
            IOUtils.closeQuietly(outputStream);
            return resource;
        }
    }



使用的实体类上打好注解作为表头部分，例如

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class PromotionMonitorExcalInfo {

    @ExcelProperty("Deal ID")
    @ApiModelProperty(value = "Deal ID")
    private String dealID;private String dealPrice;
    @ExcelProperty("时间")
    @ApiModelProperty(value = "时间")
    private String ntime;
    @ExcelProperty("Sales")
    @ApiModelProperty(value = "Sales")
    private String trustee;
    @ExcelProperty("创建时间")
    @ApiModelProperty(value = "创建时间")
    private String createTimeFormat;

}