导出2000条row的时候效率很低 about excel-plus HOT 4 CLOSED

        for (int rowNum = startRow; iterator.hasNext(); rowNum++) {
            T   item = iterator.next();
            Row row  = sheet.createRow(rowNum);
            if (null != rowStyle) {
                row.setRowStyle(rowStyle);
            }
            Iterator<Integer> colIt = columnIndexes.iterator();
            while (colIt.hasNext()) {
                int    col   = colIt.next();
                Cell   cell  = row.createCell(col);
                String value = ExcelUtils.getColumnValue(item, col);
                if (null != columnStyle) {
                    cell.setCellStyle(columnStyle);
                }
                if (null != value) {
                    if (ExcelUtils.isNumber(value)) {
                        cell.setCellValue(Double.valueOf(value));
                    } else {
                        cell.setCellValue(value);
                    }
                } else {
                    cell.setCellValue(value);
                }
                // sheet.autoSizeColumn(col);
            }
        }

        Iterator<Integer> colIt = columnIndexes.iterator();
        while (colIt.hasNext()) {
            int    col   = colIt.next();
            sheet.autoSizeColumn(col);
        }