spring mvc poi导出excel

@RequestMapping(value = "/importexcel.htm", method = RequestMethod.GET)
public ModelAndView _importExcel(HttpServletRequest request, HttpServletResponse response, Integer cId) throws Exception {

// 获得要导出的数据集
List<Map<String, Object>> list = d_ExchangeCodeService.selectExcelRecord(cId);

// 创建excel工作簿
Workbook wb = new HSSFWorkbook();
// 创建第一个sheet（页），并命名
Sheet sheet = wb.createSheet(list.get(0).get("NAME").toString());

// 手动设置列宽。第一个参数表示要为第几列设；，第二个参数表示列的宽度，n为列高的像素数。
sheet.setColumnWidth((short) 0, (short) (35.7 * 150));
sheet.setColumnWidth((short) 1, (short) (35.7 * 150));
sheet.setColumnWidth((short) 2, (short) (35.7 * 150));
sheet.setColumnWidth((short) 3, (short) (35.7 * 100));
sheet.setColumnWidth((short) 4, (short) (35.7 * 250));
sheet.setColumnWidth((short) 5, (short) (35.7 * 150));
sheet.setColumnWidth((short) 6, (short) (35.7 * 150));

// 创建第一行
Row row = sheet.createRow((short) 0);

// 创建两种单元格格式
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();
// DataFormat df = wb.createDataFormat();// 创建两种字体
Font f = wb.createFont();
Font f2 = wb.createFont();

// 创建第一种字体样式
f.setFontHeightInPoints((short) 10);
f.setColor(IndexedColors.RED.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);

// 创建第二种字体样式
f2.setFontHeightInPoints((short) 10);
f2.setColor(IndexedColors.BLACK.getIndex());
f2.setBoldweight(Font.BOLDWEIGHT_BOLD);

// 设置第一种单元格的样式
cs.setFont(f);
cs.setBorderLeft(CellStyle.BORDER_THIN);
cs.setBorderRight(CellStyle.BORDER_THIN);
cs.setBorderTop(CellStyle.BORDER_THIN);
cs.setBorderBottom(CellStyle.BORDER_THIN);
// cs.setDataFormat(df.getFormat("#,##0.0"));// 设置第二种单元格的样式
cs2.setFont(f2);
cs2.setBorderLeft(CellStyle.BORDER_THIN);
cs2.setBorderRight(CellStyle.BORDER_THIN);
cs2.setBorderTop(CellStyle.BORDER_THIN);
cs2.setBorderBottom(CellStyle.BORDER_THIN);
// cs2.setDataFormat(df.getFormat("text"));// 创建列（每行里的单元格）
Cell cell = row.createCell(0);
cell.setCellValue("用户名");
cell.setCellStyle(cs);

cell = row.createCell(1);
cell.setCellValue("订单号");
cell.setCellStyle(cs);

cell = row.createCell(2);
cell.setCellValue("兑换券序列号");
cell.setCellStyle(cs);

cell = row.createCell(3);
cell.setCellValue("兑换券金额");
cell.setCellStyle(cs);

cell = row.createCell(4);
cell.setCellValue("兑换券类型名称");
cell.setCellStyle(cs);

cell = row.createCell(5);
cell.setCellValue("使用时间");
cell.setCellStyle(cs);

cell = row.createCell(6);
cell.setCellValue("使用结束日期");
cell.setCellStyle(cs);

DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

for (short i = 0; i < list.size(); i++) {

// Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的// 创建一行，在页sheet上
row = sheet.createRow((short) i + 1);
// 在row行上创建一个方格
cell = row.createCell(0);
cell.setCellValue(list.get(i).get("usr_UserID") == null ? "未使用" : list.get(i).get("usr_UserID").toString());
cell.setCellStyle(cs2);

cell = row.createCell(1);
cell.setCellValue(list.get(i).get("ord_OrderID") == null ? "未使用" : list.get(i).get("ord_OrderID").toString());
cell.setCellStyle(cs2);

cell = row.createCell(2);
cell.setCellValue(list.get(i).get("Account").toString());
cell.setCellStyle(cs2);

cell = row.createCell(3);
cell.setCellValue(Double.parseDouble(list.get(i).get("Amount").toString()));
cell.setCellStyle(cs2);

cell = row.createCell(4);
cell.setCellValue(list.get(i).get("NAME").toString());
cell.setCellStyle(cs2);

cell = row.createCell(5);
cell.setCellValue(list.get(i).get("UsedTime") == null ? "未使用" : df.format(list.get(i).get("UsedTime")).toString());
cell.setCellStyle(cs2);

cell = row.createCell(6);
cell.setCellValue(df.format(list.get(i).get("BlankOutTime")).toString());
cell.setCellStyle(cs2);
}

ByteArrayOutputStream os = new ByteArrayOutputStream();

try {
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
}

byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);

// 设置response参数，可以打开下载页面
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=" + new String((list.get(0).get("NAME").toString() + ".xls").getBytes(), "iso-8859-1"));

ServletOutputStream out = response.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);
}

} catch (final IOException e) {
throw e;
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
return null;

}