excel模板文件下载

方案一：

以下demo主要采用的方案是在项目的resources/template文件夹下存放好限定了若干条件的excel文件，用流的方式下载，支持弹窗方式选定下载路径和后端指定路径的方式。

首先需要制作一个限定了若干条件的excel（例如限定文本/日期/数字/分数等格式，设置批注，设置输入值的校验等），目的在于限制运维人员规范的填写文件数据，避免胡乱的填写excel并进行错误的文件导入。博客不支持附件上传已制作好的excel模板文件，只好作罢，需要的可以留言索要。、

ok，下面就是上代码的时候了：

/**
* 功能：商户结算单文件的下载：xxx.xlsx文件
* @throws IOException
*/
@RequestMapping(value = "/transactionSettleOrder/download", method = {RequestMethod.POST, RequestMethod.GET} )
@RequestGuard(perm = "merchant.settle.download")
public void downloadSettleOrderFile(HttpServletRequest req, HttpServletResponse resp) throws IOException {
String queryParam = req.getParameter("queryParam").replace(""", "'").replace("''", "null");
SettlementOrderModel settlementOrderModel = JSONObject.parseObject(queryParam, SettlementOrderModel.class);
logger.info("SettlementOrderRestApiController downloadSettleOrderFile....request params is  :　" + JSON.toJSONString(settlementOrderModel));
XSSFWorkbook xlsxWorkbook = new XSSFWorkbook();
XSSFSheet sheet = xlsxWorkbook.createSheet("结算单查询的文件下载");
XSSFRow row = sheet.createRow(0);
String titleParams = "序号,商户号,商户名称,结算单号,结算日期,交易开始日期,交易截止日期,交易币种,支付金额,退款金额,支付手续费,退款手续费,结算金额,结算币种,结算单状态";
ExcelDownloadHelperController excelHelper = new ExcelDownloadHelperController();
XSSFCell cell = (XSSFCell)excelHelper.setTitle(row, titleParams);
cell = (XSSFCell)settlementOrderService.setDetailData(sheet, cell, row, settlementOrderModel);

String fileName = "商户结算单_" + (new SimpleDateFormat("yyyyMMdd").format(new Date()));
ExcelDownloadHelperController excelhelper = new ExcelDownloadHelperController();
excelhelper.downloadOutStream(xlsxWorkbook, resp, true, fileName);
}

调用的工具类：（可复用）

public class ExcelDownloadHelperController {

/*
* 功能：写入excel文件中的标题行
* @Param row
* @Param titleParams 传入字符串参数，以逗号分割。例如"标题1,标题2,标题3"
*/
public Cell setTitle(Row row, String titleParams){
String[] titleArr = titleParams.split(",");
Cell cell = null;
for (int i = 0; i < titleArr.length; i++) {
cell = row.createCell(i);
cell.setCellValue(titleArr[i]);
}
return cell;
}

/*
* 功能：用流的方式的excel文件的下载
* @Param workbook
* @Param isPopupStyle 是否弹出下载框的方式，若是false，则自动下载为E:/{fileName}.xlsx
* @Param fileName 要下载出的文件名
*/
public void downloadOutStream(Workbook workbook, HttpServletResponse resp, boolean isPopupStyle, String fileName) throws IOException {
if (isPopupStyle) {	//弹出下载框的方式
ByteArrayOutputStream os = new ByteArrayOutputStream();
workbook.write(os);
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数，可以打开下载页面
resp.reset();
resp.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=iso-8859-1");
resp.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xlsx").getBytes(), "iso-8859-1"));
resp.setContentLength(content.length);
ServletOutputStream out = resp.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;

try {
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/w
bc8b
rite loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bos.flush();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("下载发生异常，请重新下载！");
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
} else {	//不弹出下载框的方式
FileOutputStream fos = new FileOutputStream("E:/"+ fileName + ".xlsx");
workbook.write(fos);
fos.close();
}
}

}

本着无私的精神，再附上前端的代码（html + angularJS）：

//文件模板下载
$scope.downloadTemplate = function(){
location.href = "/proxy/cap-cbs-mgr/mgr/transDetail/download";
};

<div class="ice-column">
<ice-permission value='transaction.import.download' out='downloadTemplate123'>
<ice-button text='文件模板下载' hanle-click='downloadTemplate()'/>
</ice-permission>
</div>

方案二：直接用代码来生成，略繁琐，仅供参考。

/**
* 文件模板下载(EXCEL文件)--备份
* @return
* @throws IOException
*/
@RequestMapping(value = "/transDetail/download", method = {RequestMethod.POST, RequestMethod.GET} )
public void downloadTemplateFileBackUp(HttpServletRequest req, HttpServletResponse resp) throws IOException{
logger.info("downloadTemplateFile start!");
if (false) { //写死走xlsx格式
HSSFWorkbook xlsWorkbook = new HSSFWorkbook();
HSSFSheet sheet = xlsWorkbook.createSheet("交易导入的文件模板表");
HSSFRow row = sheet.createRow((int) 0);
HSSFCell cell = (HSSFCell)this.setSummaryTitle(row);
row = sheet.createRow(1);
row = sheet.createRow(2);
cell = (HSSFCell)this.setDetailTitle(row);
String fileName = "商户号_YYYYMMDD_批次号";
downloadOutStream(xlsWorkbook, resp, true, ".xls", fileName);
} else {
XSSFWorkbook xlsxWorkbook = new XSSFWorkbook();
XSSFSheet sheet = xlsxWorkbook.createSheet("交易导入的文件模板表");
XSSFRow row = sheet.createRow((int) 0);
XSSFCell cell = (XSSFCell)this.setSummaryTitle(row);
row = sheet.createRow(1);
row = sheet.createRow(2);
cell = (XSSFCell)this.setDetailTitle(row);
String fileName = "商户号_YYYYMMDD_批次号";
downloadOutStream(xlsxWorkbook, resp, true, ".xlsx", fileName);
}
}

public Cell setSummaryTitle(Row row){
// 设置表头
Cell cell = row.createCell(0);
cell.setCellValue("商户号");

cell = row.createCell(1);
cell.setCellValue("商户名称");

cell = row.createCell(2);
cell.setCellValue("商户批次号");

cell = row.createCell(3);
cell.setCellValue("支付总笔数（单位：笔）");

cell = row.createCell(4);
cell.setCellValue("支付总金额（单位：分）");

cell = row.createCell(5);
cell.setCellValue("退款总笔数（单位：笔）");

cell = row.createCell(6);
cell.setCellValue("退款总金额（单位：分）");

cell = row.createCell(7);
cell.setCellValue("净笔数（单位：笔）");

cell = row.createCell(8);
cell.setCellValue("净金额（单位：分）");

return cell;
}

public Cell setDetailTitle(Row row){
// 设置表头
Cell cell = row.createCell(0);
cell.setCellValue("序号");

cell = row.createCell(1);
cell.setCellValue("商户订单号");

cell = row.createCell(2);
cell.setCellValue("支付（退款）订单号");

cell = row.createCell(3);
cell.setCellValue("原支付订单号");

cell = row.createCell(4);
cell.setCellValue("商户交易日期");

cell = row.createCell(5);
cell.setCellValue("交易类型");

cell = row.createCell(6);
cell.setCellValue("币种");

cell = row.createCell(7);
cell.setCellValue("结算金额");

cell = row.createCell(8);
cell.setCellValue("客户类型");

cell = row.createCell(9);
cell.setCellValue("客户名称");

cell = row.createCell(10);
cell.setCellValue("证件类型");

cell = row.createCell(11);
cell.setCellValue("证件号码");

cell = row.createCell(12);
cell.setCellValue("款项类型");

cell = row.createCell(13);
cell.setCellValue("保税货物项下付款");

cell = row.createCell(14);
cell.setCellValue("交易编码");

cell = row.createCell(15);
cell.setCellValue("款项类型");

cell = row.createCell(16);
cell.setCellValue("人民币账号");

cell = row.createCell(17);
cell.setCellValue("交易附言");

return cell;
}

public void downloadOutStream(Workbook workbook, HttpServletResponse resp, boolean isPopupStyle, String suffix, String fileName) throws IOException{
if (isPopupStyle) { //弹出下载框的方式
ByteArrayOutputStream os = new ByteArrayOutputStream();
workbook.write(os);
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数，可以打开下载页面
resp.reset();
if (suffix.equals(".xls")) { //支持.xls格式的
resp.setContentType("application/vnd.ms-excel;charset=iso-8859-1");
resp.setHeader("Content-Disposition", "attachment;filename=" + new String((fileName + ".xls").getBytes(), "iso-8859-1"));
}
if (suffix.equals(".xlsx")) {
resp.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=iso-8859-1");
resp.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xlsx").getBytes(), "iso-8859-1"));
resp.setContentLength(content.length);
}
ServletOutputStream out = resp.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;

try {
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bos.flush();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("下载发生异常，请重新下载！");
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
} else { //不弹出下载框的方式
FileOutputStream fos = new FileOutputStream("E:/"+ fileName + ".xlsx");
workbook.write(fos);
fos.close();
}
}