导出EXCEL的 两个方法

方法一：

 /**
   * 导出参数模板设置，通过相似查找出来的数据
 */
    private void handleExportToExcelByLikeQuery(Page page, HttpServletResponse response) {
        try {
            List<ExworkRecordExportVo> list = new ArrayList<>();
            List<ExworksRecord> exworksRecordList = page.getList();
            if (exworksRecordList != null) {
                for (ExworksRecord e : exworksRecordList) {
                    ExworkRecordExportVo v = new ExworkRecordExportVo();
                    v.setOrderNo(e.getOrderNo());
                    v.setApplierNo(e.getApplierNo());
                    v.setApplierName(e.getApplierName());
                    v.setLeaderNo(e.getLeaderNo());
                    v.setLeaderName(e.getLeaderName());
                    v.setpInTime(e.getpInTime());
                    v.setpOutTime(e.getpOutTime());
                    switch (e.getStatus()) {
                        case "1":
                            v.setStatus("审核中");
                            break;
                        case "2":
                            v.setStatus("已通过");
                            break;
                        case "3":
                            v.setStatus("驳回");
                            break;
                        case "4":
                            v.setStatus("废弃");
                            break;
                        default:
                            v.setStatus("");
                            break;
                    }
                    v.setRemark(e.getRemark());
                    v.setFinishStatus("1".equals(e.getFinishStatus())?"未完成":"完成");
                    v.setCreateTime(e.getCreateTime());
                    list.add(v);
                }
            }
            ExportParams params = new ExportParams("申请列表", "申请列表", ExcelType.HSSF);
            Workbook workbook = ExcelExportUtil.exportExcel(params, ExworkRecordExportVo.class, list);
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode("申请列表--" + dateFormat.format(new Date()) + "" + ".xls", "UTF-8"));// 组装附件名称和格式
            ServletOutputStream out = response.getOutputStream();
            workbook.write(out);
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

主要用的三个jar包

import org.jeecgframework.poi.excel.ExcelExportUtil;
import org.jeecgframework.poi.excel.entity.ExportParams;
import org.jeecgframework.poi.excel.entity.enmus.ExcelType;

ExcelExportUtil.exportExcel(params, ExworkRecordExportVo.class, list); 
主要参数： 1：ExportParams 、2：实体类 ExworkRecordExportVo 3：实体类对应的list 
在封装一下excel的名字和其他参数即可

方法二：

public void exportConferenceEnrolChangeList(@RequestParam(required = true, value = "enrolId") Integer enrolId,
                                            @RequestParam(required = true, value = "accessToken") String accessToken, HttpServletResponse response) throws IOException {
    logger.info("*****调用 ConferenceEnrolChangeController 类 - exportConferenceEnrolChangeList 方法，参数：enrolId:" + enrolId + ", accessToken:" + accessToken);
    Assert.assertNotEmpty(accessToken, "accessToken");
    Assert.assertIntNotEmpty(enrolId, "enrolId");
    response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode("报名名单配置变更记录.xls", "UTF-8"));

    // 第一步，创建一个webbook，对应一个Excel文件
    HSSFWorkbook wb = new HSSFWorkbook();
    // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
    HSSFSheet sheet = wb.createSheet("变更记录");
    // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
    HSSFRow row = sheet.createRow((int) 0);
    // 第四步，创建单元格，并设置值表头 设置表头居中
    HSSFCellStyle style = wb.createCellStyle();
    style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

    HSSFCell cell = row.createCell((short) 0);
    cell.setCellValue("操作人");
    cell.setCellStyle(style);
    cell = row.createCell((short) 1);
    cell.setCellValue("mip");
    cell.setCellStyle(style);
    cell = row.createCell((short) 2);
    cell.setCellValue("单位");
    cell.setCellStyle(style);
    cell = row.createCell((short) 3);
    cell.setCellValue("部门");
    cell.setCellStyle(style);
    cell = row.createCell((short) 4);
    cell.setCellValue("变更操作");
    cell.setCellStyle(style);
    cell = row.createCell((short) 5);
    cell.setCellValue("变更内容");
    cell.setCellStyle(style);
    cell = row.createCell((short) 6);
    cell.setCellValue("变更原因");
    cell.setCellStyle(style);

    // 第五步，写入实体数据   service查询数据库得到的list
    List<ConferenceEnrolChangeRecord> list = conferenceEnrolChangeService.getConferenceEnrolChangeListForExport(enrolId);

    for (int i = 0; i < list.size(); i++) {
        row = sheet.createRow(i + 1);
        ConferenceEnrolChangeRecord record = list.get(i);
        // 第六步，创建单元格，并设置值
        row.createCell((short) 0).setCellValue(record.getOperationName());
        row.createCell((short) 1).setCellValue(record.getMipNo());
        row.createCell((short) 2).setCellValue(record.getCompany());
        row.createCell((short) 3).setCellValue(record.getDepartment());
        row.createCell((short) 4).setCellValue(record.getChangeOperation());
        row.createCell((short) 5).setCellValue(record.getChangeContent());
        row.createCell((short) 6).setCellValue(record.getChangeReason());
    }

    try {
        ServletOutputStream out = response.getOutputStream();
        wb.write(out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

是一个接接口调用方法，创建步骤很明确，一步一步操作即可；