一：原因

近几年项目中，一直会使用easyExcel ，1.封装性 2.性能较好，3.使用方便，所以目前在新需求中，一般会采用该方式。

二：使用

引入pom 文件：

<!-- easyexcel -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
        </dependency>

导出工具类：

   public static void exportModule(String filename, HttpServletResponse response, Class<?> classModule, List<?> data) throws IOException {

        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-disposition", "attachment;filename*=utf-8'zh_cn'"+ getFilename(filename));
        EasyExcel.write(response.getOutputStream(), classModule).sheet("1").doWrite(data);
    }
     private static String getFilename(String filename) throws UnsupportedEncodingException {

        String fileName = filename+ DateUtils.formatDate(new Date());
        return URLEncoder.encode(fileName,"UTF-8") +".xlsx";
    }

导出实体vo定义：

public class OrderExportVo implements Serializable {

    /**
     * 卖家姓名 value 指导出标题 index 指位置
     */
    @ExcelProperty(value = "卖家姓名",index = 0)
    private String sellerName;

    public String getSellerName() {
        return sellerName;
    }

    public void setSellerName(String sellerName) {
        this.sellerName = sellerName;
    }

controller 调用：

    @RequestMapping("/export")
    public PoppyResponse<?> export(HttpServletResponse response,
                                            @RequestParam(required = false, value = "startDate") String startDate,
                                            @RequestParam(required = false, value = "endDate") String endDate) {
        try {
            //查询符合条件的订单信息
            List<Vo> exportUsers = new ArrayList<>();
            QueryVo query = new QueryVo();
            int page = 1;
            int pageSize = 100;
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            dateFormat.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
            if (startDate != null) {
                Long start = dateFormat.parse(startDate).getTime();
                query.setStartTime(start);
            }
            if (endDate != null) {
                Long end = dateFormat.parse(endDate).getTime();
                query.setEndTime(end);
            }
            query.setPageSize(pageSize);
            query.setOrderStatus(status);
            logger.info("query:{}", JSON.toJSONString(query));
            while (true) {
                query.setCurPage(page++);
                // 这里是业务代码，分页查询
                Page<Vo> list = xxxService.query(query);
                if (CollectionUtils.isEmpty(list.getContents())) {
                    break;
                }
                exportUsers.addAll(list.getContents());
                //最大导出数据 10万
                if (page > 100000) {
                    break;
                }
            }
            ExcelUtils.exportModule("export_info_", response, OrderExportVo.class, exportUsers);
        } catch (Exception e) {
            logger.error("export error ", e);
        }
        return PoppyResponse.success("export success");
    }