如何使用apache poi从公式单元格中读取单元格值

Posted 2021-04-09

我试图从excel文件中读取所有数据，该文件也有一些公式单元格，但我不知道哪个单元格是公式单元格。如何从细胞中读取所有值，而不管细胞的类型如何。

我的代码看起来像这样

FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
while (rows.hasNext()) {
     row = (HSSFRow) rows.next();
     Iterator cells = row.cellIterator();
     while (cells.hasNext()) {
             cell = (HSSFCell) cells.next();
             if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                  ar.add(cell.getStringCellValue());
             } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
                 ar.add(cell.getNumericCellValue());
             }else if (cell.getCellType() == HSSFCell.CELL_TYPE_FORMULA) {
                 ar.add(evaluator.evaluateFormulaCell(cell));
             } else {
                 ar.add("");
             }
     }
}

我将公式单元格值设为0

答案

你正在寻找的方法是Cell.getCachedFormulaResultType - 对于一个公式单元格，它会告诉你公式结果的类型

您的代码可以是这样的：

private void handleCell(int type, Cell cell) {
         if (type == HSSFCell.CELL_TYPE_STRING) {
              ar.add(cell.getStringCellValue());
         } else if (type == HSSFCell.CELL_TYPE_NUMERIC) {
             ar.add(cell.getNumericCellValue());
         } else if (type == HSSFCell.CELL_TYPE_BOOLEAN) {
             ar.add(cell.getBooleanCellValue());
         } else if (type == HSSFCell.CELL_TYPE_FORMULA) {
             // Re-run based on the formula type
             handleCell(cell.getCachedFormulaResultType(), cell);
         } else {
             ar.add("");
         }
}

public void handleSheet(Sheet sheet) {
    for (Row row : sheet) {
       for (Cell cell : row) {
           handleCell(cell.getCellType(), cell);
       }
    }
}

请注意，迭代器仅提供文件中定义的单元格，因此如果从未使用过单元格，则会出现间隙。如果您需要让每个单元格包括丢失的单元格，请参阅Iterating vs Fetching docs

另一答案

使用Cell.getCachedFormulaResultType，我们得到缓存的公式值;因此，我们必须评估公式以获得新值

public static void main(String args[]) {
    FileInputStream inp = null;
    try {            
        inp = new FileInputStream("E:\Hasangi\tets\test\book.xls");

        HSSFWorkbook workbook = new HSSFWorkbook(inp);
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        HSSFSheet sheet = workbook.getSheetAt(0);
        Row row = sheet.getRow(2);
        Cell cell = row.getCell(0);

        cell.setCellValue(1235487845);
        handleSheet(sheet, evaluator);
        FileOutputStream fileOut = new FileOutputStream("E:\Hasangi\tets\test\book.xls");
        workbook.write(fileOut);
        fileOut.close();
    } catch (IOException ex) {
        Logger.getLogger(xlreader.class.getName()).log(Level.SEVERE, null, ex);
    }
}

private static void handleCell(int type, Cell cell, FormulaEvaluator evaluator) {
    if (type == HSSFCell.CELL_TYPE_STRING) {
      System.out.println(cell.getStringCellValue());
    } else if (type == HSSFCell.CELL_TYPE_NUMERIC) {
       System.out.println(cell.getNumericCellValue());
    } else if (type == HSSFCell.CELL_TYPE_BOOLEAN) {
       System.out.println(cell.getBooleanCellValue());
    } else if (type == HSSFCell.CELL_TYPE_FORMULA) {
        // Re-run based on the formula type
        evaluator.evaluateFormulaCell(cell);
        handleCell(cell.getCachedFormulaResultType(), cell, evaluator);
    } else {
       System.out.println("");
    }
}

public static void handleSheet(Sheet sheet,FormulaEvaluator evaluator) {
    for (Row row : sheet) {
        for (Cell cell : row) {
            handleCell(cell.getCellType(), cell,evaluator);
        }
    }
}

另一答案

这是我的功能：

public void getValueOfFormulaCell() throws IOException
{
    FileInputStream xlsfile = new FileInputStream(new File("D:\Desktop\Temp\marks.xls"));
    HSSFWorkbook objWorkbook = new HSSFWorkbook(xlsfile);
    Sheet sheet = objWorkbook.getSheetAt(0);
    FormulaEvaluator evaluator = objWorkbook.getCreationHelper().createFormulaEvaluator();

    // suppose your formula is in B4
    CellReference cellReference = new CellReference("B4"); 
    Row row = sheet.getRow(cellReference.getRow());
    Cell cell = row.getCell(cellReference.getCol()); 

    CellValue cellValue = evaluator.evaluate(cell);

    switch (cellValue.getCellType()) {
        case Cell.CELL_TYPE_BOOLEAN:
            System.out.println(cellValue.getBooleanValue());
            break;
        case Cell.CELL_TYPE_NUMERIC:
            System.out.println(cellValue.getNumberValue());
            break;
        case Cell.CELL_TYPE_STRING:
            System.out.println(cellValue.getStringValue());
            break;
        case Cell.CELL_TYPE_BLANK:
            break;
        case Cell.CELL_TYPE_ERROR:
            break;

        // CELL_TYPE_FORMULA will never happen
        case Cell.CELL_TYPE_FORMULA: 
            break;
    }               
    }