code: public static Cell findCell(Sheet sheet, String cellReference, String searchKey) {
          if (isFullCellReference(cellReference)) {
              return findCell(sheet, cellReference);
          }
  
          if (isColReference(cellReference)) {
              val cellRef = new CellReference(cellReference + "1");
              return searchColCell(sheet, cellRef.getCol(), searchKey);
          }
  
          if (isRowReference(cellReference)) {
              val cellRef = new CellReference("A" + cellReference);
              return searchRowCell(sheet, cellRef.getRow(), searchKey);
          }
  
          return searchCell(sheet, searchKey);
      }
docs: 查找单元格。
  
  @param sheet         表单
  @param cellReference 单元格索引
  @param searchKey     单元格中包含的关键字
  @return 单元格，没有找到时返回null