导出ExcelDemo

public String exportExcel(){
		String message=null;
		SimpleDateFormat  df =new SimpleDateFormat("yyyy-MM-dd");
		AdvertisementPutInList advertisementPutInList=new AdvertisementPutInList();
		List<AdvertisementPutInList>  listAdvertisementPutInList =advertisementPutInListService.findAllList(advertisementPutInList);
		try {
			WritableWorkbook wwb = null;
			// 创建可写入的Excel工作簿
			String fileName = "D://广告投放单.xls";
			File file = new File(fileName);
			if (!file.exists()) {
				file.createNewFile();
			}
			//以fileName为文件名来创建一个Workbook
			wwb = Workbook.createWorkbook(file);
			// 创建工作表
            WritableSheet ws = wwb.createSheet("广告投放单", 0);
          //要插入到的Excel表格的行号，默认从0开始
            Label labelId= new Label(0, 0, "编号");
            Label labelAdvertiser= new Label(1, 0, "广告主名称");
            Label labelPrice= new Label(2, 0, "投放价格（元/CPC/M）");
            Label labelAdsName= new Label(3, 0, "广告名称");
            Label labelPutType= new Label(4, 0, "投放类型（正式投放）");
            Label labelAdsStyle= new Label(5, 0, "广告形式（弹窗/富媒体（flash，JGP，GIF）");
            Label labelAdsUrl= new Label(6, 0, "广告链接");
            Label labelPutTime= new Label(7, 0, "投放日期");
            Label labelPutTimeSlot= new Label(8, 0, "投放时间段");
            Label labelPutArea= new Label(9, 0, "投放地域");
            Label labelPutTotal= new Label(10, 0, "投放总量");
            Label labelPutAmountStyle= new Label(11, 0, "投放量形式（日/CPC/M）");
            Label labelDomainLimit= new Label(12, 0, "域名限定（客户指定/电信库）");
            Label labelDomainQuota= new Label(13, 0, "域名额度（增量/减量）");
            Label labelPlatformAccountNumber= new Label(14, 0, "平台账号");
            //Label labelPlatformPassword= new Label(15, 0, "平台密码");
            Label labelCnzzAccountNumber= new Label(15, 0, "CNZZ账号");
            //Label labelCnzzPassword= new Label(17, 0, "CNZZ密码");
            Label labelCreateBy= new Label(16, 0, "创建者");
            Label labelCreateDate= new Label(17, 0, "创建时间");
            Label labelUpdateBy= new Label(18, 0, "更新者");
            Label labelUpdateDate= new Label(19, 0, "更新时间");
            Label labelRemarks= new Label(20, 0, "备注");
            ws.addCell(labelId);
            ws.addCell(labelAdvertiser);
            ws.addCell(labelPrice);
            ws.addCell(labelPutType);
            ws.addCell(labelAdsStyle);
            ws.addCell(labelAdsUrl);
            ws.addCell(labelPutTime);
            ws.addCell(labelPutTimeSlot);
            ws.addCell(labelPutArea);
            ws.addCell(labelPutTotal);
            ws.addCell(labelPutAmountStyle);
            ws.addCell(labelDomainLimit);
            ws.addCell(labelDomainQuota);
            ws.addCell(labelPlatformAccountNumber);
            //ws.addCell(labelPlatformPassword);
            ws.addCell(labelCnzzAccountNumber);
            //ws.addCell(labelCnzzPassword);
            ws.addCell(labelCreateBy);
            ws.addCell(labelCreateDate);
            ws.addCell(labelUpdateBy);
            ws.addCell(labelUpdateDate);
            ws.addCell(labelRemarks);
            for (int i = 0; i < listAdvertisementPutInList.size(); i++) {
            	Label labelId_I= new Label(0, i+1, (i+1)+"");
                Label labelAdvertiser_I= new Label(1, i+1, listAdvertisementPutInList.get(i).getAdvertiser());
                Label labelPrice_I= new Label(2, i+1, listAdvertisementPutInList.get(i).getPrice());
                Label labelAdsName_I= new Label(3, i+1, listAdvertisementPutInList.get(i).getAdsName());
                Label labelPutType_I= new Label(4, i+1, listAdvertisementPutInList.get(i).getPutType());
                Label labelAdsStyle_I= new Label(5, i+1, listAdvertisementPutInList.get(i).getAdsStyle());
                Label labelAdsUrl_I= new Label(6, i+1, listAdvertisementPutInList.get(i).getAdsUrl());
                Label labelPutTime_I= new Label(7, i+1, listAdvertisementPutInList.get(i).getPutTime());
               // Label labelPutTimeSlot_I= new Label(8, i+1, listAdvertisementPutInList.get(i).getPutTimeSlot());
                Label labelPutArea_I= new Label(9, i+1, listAdvertisementPutInList.get(i).getPutArea());
                Label labelPutTotal_I= new Label(10, i+1, listAdvertisementPutInList.get(i).getPutTotal());
                Label labelPutAmountStyle_I= new Label(11, i+1, listAdvertisementPutInList.get(i).getPutAmountStyle());
                Label labelDomainLimit_I= new Label(12, i+1, listAdvertisementPutInList.get(i).getDomainLimit());
                Label labelDomainQuota_I= new Label(13, i+1, listAdvertisementPutInList.get(i).getDomainQuota());
                Label labelPlatformAccountNumber_I= new Label(14, i+1, listAdvertisementPutInList.get(i).getPlatformAccountNumber());
                //Label labelPlatformPassword_I= new Label(15, i+1, listAdvertisementPutInList.get(i).getPlatformPassword());
                Label labelCnzzAccountNumber_I= new Label(15, i+1, listAdvertisementPutInList.get(i).getCnzzAccountNumber());
                //Label labelCnzzPassword_I= new Label(17, i+1, listAdvertisementPutInList.get(i).getCnzzPassword());
                Label labelCreateBy_I= new Label(16, i+1, "系统管理人员");
                Label labelCreateDate_I= new Label(17, i+1,  df.format(listAdvertisementPutInList.get(i).getCreateDate()));
                Label labelUpdateBy_I= new Label(18, i+1, "系统管理人员");
                Label labelUpdateDate_I= new Label(19, i+1,  df.format(listAdvertisementPutInList.get(i).getUpdateDate()));
                Label labelRemarks_I= new Label(20, i+1, listAdvertisementPutInList.get(i).getRemarks());
                ws.addCell(labelId_I);
                ws.addCell(labelAdvertiser_I);
                ws.addCell(labelPrice_I);
                ws.addCell(labelPutType_I);
                ws.addCell(labelAdsStyle_I);
                ws.addCell(labelAdsUrl_I);
                ws.addCell(labelPutTime_I);
               // ws.addCell(labelPutTimeSlot_I);
                ws.addCell(labelPutArea_I);
                ws.addCell(labelPutTotal_I);
                ws.addCell(labelPutAmountStyle_I);
                ws.addCell(labelDomainLimit_I);
                ws.addCell(labelDomainQuota_I);
                ws.addCell(labelPlatformAccountNumber_I);
                //ws.addCell(labelPlatformPassword_I);
                ws.addCell(labelCnzzAccountNumber_I);
                //ws.addCell(labelCnzzPassword_I);
                ws.addCell(labelCreateBy_I);
                ws.addCell(labelCreateDate_I);
                ws.addCell(labelUpdateBy_I);
                ws.addCell(labelUpdateDate_I);
                ws.addCell(labelRemarks_I);
            }
          //写进文档
            wwb.write();
           // 关闭Excel工作簿对象
            wwb.close();
            logger.info("导出成功!");
            message="导出成功，位于 D://广告投放单.xls";
		} catch (Exception e) {
			e.printStackTrace();
			logger.info("导出失败!"+e);
			 message="导出失败！";
		}
		return message;
}