完美解决POI写批注报错comments in one cell are not allowed, cell....问题

解决方案：

示例代码如下：

  /**
     * 给某一格设置注释
     * @param sheet
     * @param rowIndex
     * @param colIndex
     * @param value
     */
    public static void setCellCommon(Sheet sheet, int rowIndex, int colIndex, String value) {
        Row row = sheet.getRow(rowIndex);
        if (row == null) {
//            log.debug(ExcelConfig.ERROR + " setCellCommon," + sheet.getSheetName() + "第" + rowIndex + "为NULL");
            return;
        }
        Cell cell = row.getCell(colIndex);
        if (cell == null) {
            cell = row.createCell(colIndex);
        }
        if(value == null){
            cell.removeCellComment();
            return;
        }
        Drawing drawing = sheet.createDrawingPatriarch();
        CreationHelper factory = sheet.getWorkbook().getCreationHelper();
        ClientAnchor anchor = factory.createClientAnchor();

        //(int dx1, int dy1, int dx2, int dy2, short col1, int row1, short col2, int row2)
        //前四个参数是坐标点,后四个参数是编辑和显示批注时的大小.
        //以上参数不设置时会有默认值，当一个被重复设置批注时会报错Multiple cell comments in one cell are not allowed
        //故在设置批注前检查锚点位置有无批注，有的话移除
        Row row1 = sheet.getRow(anchor.getRow1());
        if(row1 != null){
            Cell cell1 = row1.getCell(anchor.getCol1());
            if(cell1 != null){
                cell1.removeCellComment();
            }
        }

        Comment comment = drawing.createCellComment(anchor);
        RichTextString str = factory.createRichTextString(value);
        comment.setString(str);
        comment.setAuthor("Auto+");
        cell.setCellComment(comment);
    }