@SuppressWarnings("unchecked")
  public static void downLoad(
      List downList, String fileName, HttpServletResponse httpResponse, String downLoadId) {
    // 获取列对象集合
    httpResponse.reset();
    List columnList = new ArrayList();
    try {
      // 初始化参数
      DownloadBean downloadBean = DownloadContentHelper.getDownloadBean(downLoadId);
      columnList = downloadBean.getAttributes();
    } catch (Exception e) {

    }
    OutputStream output = null;
    try {
      output = httpResponse.getOutputStream();
      httpResponse.setContentType("application/vnd.ms-excel; charset=GBK");
      httpResponse.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xls");
      WritableWorkbook w = Workbook.createWorkbook(output);
      output.flush();
      // 分sheet页操作start
      List<Object> newTotals = new ArrayList<Object>();
      Iterator itTotals = downList.iterator();
      while (itTotals.hasNext()) {
        newTotals.add(itTotals.next());
      }
      int sheetNum = 0;
      while (newTotals.size() > MisConstants.MAXNUM_FOR_PER_SHEET) {
        WritableSheet ws = w.createSheet("Page" + (sheetNum + 1), sheetNum);
        addLabelExcel(ws, newTotals.subList(0, MisConstants.MAXNUM_FOR_PER_SHEET), columnList);
        newTotals.subList(0, MisConstants.MAXNUM_FOR_PER_SHEET).clear();
        sheetNum = sheetNum + 1;
      }
      WritableSheet ws = w.createSheet("Page" + (sheetNum + 1), sheetNum);
      addLabelExcel(ws, newTotals, columnList);
      // 分sheet页操作end
      w.write();
      // 关闭Excel工作薄对象
      w.close();
      if (output != null) output.close();

    } catch (Exception e) {
      if (output != null)
        try {
          output.close();
        } catch (IOException e1) {
        }
      e.printStackTrace();
    }
  }
  /**
   * 业务逻辑实现 - 点击统计下载excel
   *
   * @param ws 工作表
   * @param totals 待写入数据
   * @throws WriteException
   */
  @SuppressWarnings("unchecked")
  private static void addLabelExcel(WritableSheet ws, List totals, List columnList)
      throws WriteException {
    int row = 0, column = 0;
    // 设置Excel列中文标题
    Iterator itColumnList = columnList.iterator();
    while (itColumnList.hasNext()) {
      DownloadAttribute columnTitle = (DownloadAttribute) itColumnList.next();
      ws.addCell(new Label(column, row, columnTitle.getExcelName()));
      column++;
    }
    if (totals != null && totals.size() != 0) {
      Iterator itTotals = totals.iterator();
      WritableFont detFont =
          new WritableFont(
              WritableFont.ARIAL,
              10,
              WritableFont.NO_BOLD,
              false,
              UnderlineStyle.NO_UNDERLINE,
              jxl.format.Colour.BLACK);
      NumberFormat pnf = new NumberFormat("0.00"); // 用于Price Number的格式
      WritableCellFormat priceFormat = new WritableCellFormat(detFont, pnf);
      NumberFormat nf = new NumberFormat("0"); // 用于Number的格式
      WritableCellFormat numberFormat = new WritableCellFormat(detFont, nf);

      WritableFont stringFont =
          new WritableFont(
              WritableFont.ARIAL,
              10,
              WritableFont.NO_BOLD,
              false,
              UnderlineStyle.NO_UNDERLINE,
              jxl.format.Colour.BLACK);
      WritableCellFormat stringFormat = new WritableCellFormat(stringFont);
      WritableCellFormat stringWrapFormat = new WritableCellFormat(stringFont);
      stringWrapFormat.setWrap(true);

      row = 1;
      while (itTotals.hasNext()) {
        Object obj = itTotals.next();
        Map subTotals = obj instanceof Map ? (HashMap) obj : ObjectUtil.transform(obj);
        Iterator itColumnName = columnList.iterator();
        column = 0;
        while (itColumnName.hasNext()) {
          DownloadAttribute columnInfo = (DownloadAttribute) itColumnName.next();
          String columnType = columnInfo.getExcelType();
          String columnName = columnInfo.getRowName();
          Object columnValue = subTotals.get(columnName);
          if (columnValue == null) {
            column++;
            continue;
          }
          String strValue = null;
          if (columnValue instanceof Date) {
            strValue = DateTimeUtil.getFormatDateTime((Date) columnValue);
          } else {
            strValue = columnValue.toString();
          }
          // 设置内容
          if (columnType.equals("Label")) {
            if (columnValue.toString().indexOf("\r\n") > 0) {
              ws.addCell(new Label(column, row, strValue, stringWrapFormat));
            } else {
              ws.addCell(new Label(column, row, strValue, stringFormat));
            }
          }
          if (columnType.equals("Number"))
            ws.addCell(
                new jxl.write.Number(column, row, Double.parseDouble(strValue), numberFormat));
          if (columnType.equals("Price"))
            ws.addCell(
                new jxl.write.Number(column, row, Double.parseDouble(strValue), priceFormat));
          column++;
        }
        row++;
      }
    }
  }