POI导出到Excel

if (billForm.getButtonName() != null) {
				if(billForm.getButtonName().equals("export")){

					System.out.println("-------------------export start--------------------");
					HSSFWorkbook wb = new HSSFWorkbook();
					HSSFSheet sheet = wb.createSheet("new sheet");
					HSSFRow row = sheet.createRow((short) 0);
					HSSFCell cell = row.createCell((short) 0);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("手机号");
					cell = row.createCell((short) 1);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("汇款人");
					cell = row.createCell((short) 2);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("收款人");
					cell = row.createCell((short) 3);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("收款人卡号");
					cell = row.createCell((short) 4);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("开户行");
					cell = row.createCell((short) 5);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("发送日期");
					cell = row.createCell((short) 6);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("金额");
					cell = row.createCell((short) 7);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("手续费");
					cell = row.createCell((short) 8);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("小计");
					cell = row.createCell((short) 9);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("终端号码");
					cell = row.createCell((short) 10);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("支付卡号");
					cell = row.createCell((short) 11);
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellValue("支付状态");

					DetachedCriteria detachedCriteria = DetachedCriteria.forClass(WtPepBillpay.class);
			        detachedCriteria.createAlias("id", "id");

			        String start = billForm.getDateStart();
					String end = billForm.getDateEnd();
					String remitName=billForm.getRemitName();//汇款人
					String bankName=billForm.getBankName();//收款人
					String termid=billForm.getTermid();//手机号
					String zonePhone=billForm.getZonePhone();//终端号
					String payCode = billForm.getPayCodeSelect();//支付状态
					if(StringUtils.isNotEmpty(start)&&StringUtils.isNotEmpty(end)){
						detachedCriteria.add(Restrictions.between(WtPepBillpay.PEPDATE, start, end));
						billForm.setDateStart("");//清空
						billForm.setDateEnd("");//清空
					}
					if (StringUtils.isNotEmpty(bankName)) {
						String temp = bankName.trim();
//						detachedCriteria.add(Restrictions.between(WtPepBillpay.BANKNAME, billForm.getBankName().trim(), temp));
						String keyWord="%" + temp + "%";
						detachedCriteria.add(Restrictions.like(WtPepBillpay.BANKNAME, keyWord));
						billForm.setBankName("");//清空
					}
					if (StringUtils.isNotEmpty(termid)) {
						String temp = termid.trim();
//						detachedCriteria.add(Restrictions.between(WtPepBillpay.TERMID, billForm.getTermid().trim(), temp));
						String keyWord="%" + temp + "%";
						detachedCriteria.add(Restrictions.like(WtPepBillpay.BANKNAME, keyWord));
						billForm.setTermid("");//清空
					}
					if (StringUtils.isNotEmpty(zonePhone)) {
						if(zonePhone.indexOf("-")!=-1){
							String[] splitArray = zonePhone.split("-");
							String zone = splitArray[0].trim();
							String phone = splitArray[1].trim();
//							detachedCriteria.add(Restrictions.between(WtPepBillpay.ZONE, splitArray[0].trim(), temp0));
//							detachedCriteria.add(Restrictions.between(WtPepBillpay.PHONE, splitArray[1].trim(), temp1));

							String keyWord0="%" + zone + "%";
							String keyWord1="%" + phone + "%";

							detachedCriteria.add(Restrictions.like(WtPepBillpay.ZONE, keyWord0));
							detachedCriteria.add(Restrictions.like(WtPepBillpay.PHONE, keyWord1));
						}else{
							String temp = zonePhone.trim();
//							detachedCriteria.add(Restrictions.between(WtPepBillpay.PHONE, billForm.getZonePhone().trim(), temp));
							String keyWord="%" + temp + "%";
							detachedCriteria.add(Restrictions.like(WtPepBillpay.PHONE, keyWord));
						}
						billForm.setZonePhone("");//清空
					}
					if (payCode!=null){

						if(payCode.equals("SS")){

						}else if(payCode.equals("00")){//00已支付
							detachedCriteria.add(Restrictions.eq(WtPepBillpay.BILLPAYCODE, "00"));
						}
						else if(payCode.equals("FF")){
							detachedCriteria.add(Restrictions.eq(WtPepBillpay.BILLPAYCODE, "FF"));
						}
					}
					//排序
					detachedCriteria.addOrder(Order.desc("pepdate"));
					detachedCriteria.addOrder(Order.desc("peptime"));
					List exportList = this.getBillService().getListByCriteria(detachedCriteria);

					System.out.println("exportList.size="+exportList.size());

					Iterator itr = exportList.iterator();
					WtPepBillpay wtp;
					short rowNum = 1;
					String temp = "";
					while (itr.hasNext()) {
						wtp = (WtPepBillpay) itr.next();
						row = sheet.createRow(rowNum);
						cell = row.createCell((short) 0);
						cell.setCellValue(wtp.getTermid());
						cell = row.createCell((short) 1);
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue("华势");
						cell = row.createCell((short) 2);
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(wtp.getBankName());
						cell = row.createCell((short) 3);
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(wtp.getBankCard());
						cell = row.createCell((short) 4);
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						if (wtp.getOpeningBank()== null || wtp.getOpeningBank().equals(""))
							wtp.setOpeningBank("—");
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(wtp.getOpeningBank());
						cell = row.createCell((short) 5);
						temp = wtp.getPepdate().substring(0, 4) + "-"
								+ wtp.getPepdate().substring(4, 6) + "-"
								+ wtp.getPepdate().substring(6, 8);
						cell.setCellValue(temp);
						cell = row.createCell((short) 6);
						/*temp = Integer.parseInt(wtp.getTranamt().substring(
								0, 10))
								+ "." + wtp.getTranamt().substring(10, 12);*/
						temp = "￥" + Util.FormatSum(wtp.getTranamt());//modify for NumberFormatException
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(temp);
						cell = row.createCell((short) 7);
						temp = "￥" + Util.FormatSum(wtp.getFee().trim());
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(temp);
						cell = row.createCell((short) 8);
						long total = Long.parseLong(wtp.getTranamt())+Long.parseLong(Util.KillZero(wtp.getFee().trim()));
						temp = "￥" + Util.FormatSum(String.valueOf(total));
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(temp);
						cell = row.createCell((short) 9);
						if(wtp.getZone()!=null){
						cell.setCellValue(wtp.getZone().trim() + "-"
								+ wtp.getPhone());
						}else{
							cell.setCellValue(wtp.getPhone());
						}
						cell = row.createCell((short) 10);
						if (!wtp.getBillPaycode().equals("00")){
							temp = "—";
						}else{
							temp = wtp.getPayCard();
						}
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellValue(temp);
						cell = row.createCell((short) 11);
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						if (wtp.getBillPaycode().equals("00"))
							temp = "已支付";
						else
							temp = "未支付";
						cell.setCellValue(temp);
						rowNum++;
					}
					try {
						response.setContentType("octets/stream");
						response.addHeader("Content-Disposition",
								"attachment;filename=today.xls");

						OutputStream fileOut = response.getOutputStream();
						wb.write(fileOut);
						fileOut.close();

					} catch (FileNotFoundException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}

					System.out.println("--------------------export end------------------------");	

					return null;//add for "cannot forward after response has been commit"

			}
			}