Springboot整合Poi导出excel

 >
            >org.apache.poi>
            >poi-scratchpad>
            >3.15>
            >
                >
                    >poi>
                    >org.apache.poi>
                >
            >
        >

1：得到类的list就是你要到处的数据

 List<CsfAuditHistoryDto> list = csfAuditHistoryBeanSv.exportHisList(req)

2：接口处定义response

3：生成内容导出，调用编写的工具类

 HSSFWorkbook workbook = exportAuditUtil.exportCsfdeclareHisListExcel(list);
 String fileName = "csf声明环境审核历史报表" + ".xls";
 fileName = URLEncoder.encode(fileName, "utf-8");
 response.setContentType("application/octet-stream");
 response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);
response.flushBuffer();
 workbook.write(response.getOutputStream());//输出流

4：详细分解上一步，工具类

public HSSFWorkbook exportCsfHisListExcel(List<CsfAuditHistoryDto> list) {
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("excell底部的表名");
        //设置每列的宽度
        setSheetWidth(sheet);//自定义方法
        //设置宽度自适应
        sheet.autoSizeColumn(1, true);
        //添加第一行标题
        HSSFRow rowFirst = sheet.createRow(0);//框架内部方法，创建第一行
        setFirstRow(rowFirst, workbook);
        for (int i = 1; i < list.size() + 1; i++) {
            //获取固定的style，需要重新获取style，否则属性会覆盖
            CellStyle style = setFixedCellStyle(workbook);
            CsfAuditHistoryDto csfAuditHistoryDto = list.get(i - 1);
            SimpleDateFormat myFmt1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            HSSFRow row = sheet.createRow(i);
            //获取每行特有style属性
            setCellStyle(style, workbook, i);
            //服务编码
            getCell(0, row, csfAuditHistoryDto.getServiceCode(), style);
            //服务名称
            getCell(1, row, csfAuditHistoryDto.getServiceName(), style);
            //审核人
            getCell(2, row, csfAuditHistoryDto.getAuditUser(), style);
            //审核结果
            String auditResult = getAuditResult(csfAuditHistoryDto.getAuditResult());
            getCell(3, row, auditResult, style);
            if (csfAuditHistoryDto.getAuditDate() != null) {
                //审核日期
                getCell(4, row, myFmt1.format(csfAuditHistoryDto.getAuditDate()), style);
            }else {
                getCell(4, row, "", style);
            }
            //需求编码
            getCell(5, row, csfAuditHistoryDto.getRequireNum(), style);
            //申请人
            getCell(6, row, csfAuditHistoryDto.getApplyUser(), style);
            if (csfAuditHistoryDto.getApplyDate() != null) {
                //申请日期
                getCell(7, row, myFmt1.format(csfAuditHistoryDto.getApplyDate()), style);
            }else {
                getCell(7, row, "", style);
            }
            //操作类型
            String operateType = getOperateType(csfAuditHistoryDto.getOperateType());
            getCell(8, row, operateType, style);
            //申请说明
            getCell(9, row, csfAuditHistoryDto.getRemarks(), style);
            //审核说明
            //getCell(10, row, csfAuditHistoryDto.getAuditRemarks(), style);
        }
        return workbook;
    }
//第一行列名的设置
    private void setdeclareFirstRow(HSSFRow rowFirst, HSSFWorkbook workbook) {
        //获取固定的style属性
        CellStyle styleFirst = setFixedCellStyle(workbook);
        HSSFPalette palette = workbook.getCustomPalette();
        styleFirst.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        palette.setColorAtIndex((short) 9, (byte) 0, (byte) 176, (byte) 240);
        styleFirst.setFillForegroundColor((short) 9);
        getCell(0, rowFirst, "目录名称", styleFirst);
        getCell(1, rowFirst, "服务名称", styleFirst);
        getCell(0, rowFirst, "审核人", styleFirst);
        getCell(1, rowFirst, "审核结果", styleFirst);
        getCell(2, rowFirst, "审核日期", styleFirst);
        getCell(3, rowFirst, "需求编码", styleFirst);
        getCell(4, rowFirst, "申请人", styleFirst);
        getCell(5, rowFirst, "申请日期", styleFirst);
        getCell(6, rowFirst, "操作类型", styleFirst);
        getCell(7, rowFirst, "申请说明", styleFirst);
       }
  /**
     * 功能描述: 设置某个单元格的样式和值
     * @param i     单元格列数
     * @param row   单元格行
     * @param value 单元格值
     * @param style 单元格样式
     * @return void
     */
    private void getCell(int i, HSSFRow row, String value, CellStyle style) {
        HSSFCell cell = row.createCell(i);
        cell.setCellStyle(style);
        cell.setCellValue(value);
    }

    /**
     * 功能描述:设置宽度
     *
     * @param sheet HSSFSheet
     * @return void
     */
    private void setSheetWidth(HSSFSheet sheet) {
        sheet.setColumnWidth(0, 10000);
        sheet.setColumnWidth(1, 8000);
        sheet.setColumnWidth(2, 3000);
        sheet.setColumnWidth(3, 3000);
        sheet.setColumnWidth(4, 6000);
        sheet.setColumnWidth(5, 3000);
        sheet.setColumnWidth(6, 3000);
        sheet.setColumnWidth(7, 6000);
        sheet.setColumnWidth(8, 3000);
        sheet.setColumnWidth(9, 6000);
    }

    /**
     * 功能描述: 根据数据库的数字状态码返回中文操作类型
     *
     * @param operateType 数字状态码
     * @return java.lang.String
     */
    private String getOperateType(String operateType) {
        if (StringUtils.isNotEmpty(operateType)) {
            switch (operateType) {
                case "1":
                    return "新增";
                case "2":
                    return "编辑";
                case "3":
                    return "删除";
                default:
                    return "";
            }
        } else {
            return "";
        }
    }
    private String getAuditResult(String auditResult) {
        if (StringUtils.isNotEmpty(auditResult)) {
            switch (auditResult) {
                case "Y":
                    return "通过";
                case "N":
                    return "拒绝";
                default:
                    return "";
            }
        } else {
            return "";
        }
    }