Apache POI：更新 Excel 文件

Question

Apache POI：Excel 更新问题， 将新值写入单元格后： java.lang.IllegalStateException：无法从 STRING 单元格中获取 NUMERIC 值

可能是什么问题？如何解决？

我使用 5 个文件，其中 3 个可以正常工作，另外 2 个不能。 2个坏文件的解决方法： Runtime.getRuntime().exec("cmd /c start" + excel.getAbsolutePath());

    // ---------------------------------------------------------------------------

// Here: new values are written into the cells

workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();
workbook.setForceFormulaRecalculation(true);

OutputStream output = new FileOutputStream(excel.getAbsolutePath());
workbook.write(output);
output.flush();
output.close();

// Here, new values are subtracted from the cells, 
after Excel resolves with new values 


// ---------------------------------------------------------------------------

// Value in bad Cell: =B24

java.lang.IllegalStateException: Cannot get a NUMERIC value from a STRING cell
    at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:1050)
    at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:310)
    at quicc.excel.api.ExcelHandlerXSSF.handleCell(ExcelHandlerXSSF.java:275)
    at quicc.excel.api.ExcelHandlerXSSF.readCell(ExcelHandlerXSSF.java:251)

Answer 1

package poi.service;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;

public class POITestEva {

    private String excelFilePath = "C:/Test/1.xlsm";
    private FileInputStream inputStream;
    private XSSFWorkbook workbook;

    public static void main(String[] args) {
        POITestEva pOITestEva = new POITestEva();
        pOITestEva.updateCell(3.0);
        System.out.println("D5 = " + pOITestEva.readCellTest("D5"));        // Line 23
    }


    public void updateCell(Double newData) {
        try {
            File excel = new File(excelFilePath);
            inputStream = new FileInputStream(excel);
            workbook = new XSSFWorkbook(inputStream);
            workbook.setForceFormulaRecalculation(true);

            Cell cell = getCell(1, "C8");
            if (cell != null) {
                cell.setCellValue(newData);
            }

            workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();
            OutputStream output = new FileOutputStream(excel);
            workbook.write(output);
            output.flush();
            output.close();
            workbook.close();
            inputStream.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


    private Cell getCell(int sheetNr, String cellId) {
        CellReference ref = new CellReference(cellId);
        return getCell(sheetNr, ref.getCol(), ref.getRow());
    }

    private Cell getCell(int sheetNr, int col, int row) {
        XSSFSheet sheet = workbook.getSheetAt(sheetNr);
        if (sheet.getRow(row) != null
                && sheet.getRow(row).getCell(col) != null
                && !(sheet.getRow(row).getCell(col).getCellType() == Cell.CELL_TYPE_BLANK)) {
            return sheet.getRow(row).getCell(col);
        }
        return null;
    }


    public Double readCellTest(String cellId) {
        try {
            File excel = new File(excelFilePath);
            inputStream = new FileInputStream(excel);
            workbook = new XSSFWorkbook(inputStream);
            Double result = ( (Double) (readCell(cellId)) );            // Line 74
            if (workbook != null) {
                workbook.close();
            }
            if (inputStream != null) {
                workbook.close();
            }
            return result;
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private Object readCell(String cellId) {
        Cell cell = getCell(1, cellId);
        return handleCell(cell.getCellType(), cell);                    // Line 91
    }


    @SuppressWarnings("deprecation")
    private Object handleCell(int type, Cell cell) {
        switch (type) {
            case XSSFCell.CELL_TYPE_STRING:
                return cell.getStringCellValue();
            case XSSFCell.CELL_TYPE_NUMERIC:
                return cell.getNumericCellValue();
            case XSSFCell.CELL_TYPE_BOOLEAN:
                return cell.getBooleanCellValue();
            case XSSFCell.CELL_TYPE_BLANK:
                return null;
            case XSSFCell.CELL_TYPE_ERROR:
                return null;
            case XSSFCell.CELL_TYPE_FORMULA:
                return cell.getNumericCellValue();                  // Line 109
            default:
                return null;
        }
    }

}

Answer 2

    "C:\Program Files\Java\jdk1.8.0_51\bin\java" -Didea.launcher.port=... ...java.lang.IllegalStateException: Cannot get a NUMERIC value from a STRING cell
D5 = null
    at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:1050)
    at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:310)
    at service.POITestEva.handleCell(POITestEva.java:109)
    at service.POITestEva.readCell(POITestEva.java:91)
    at service.POITestEva.readCellTest(POITestEva.java:74)
    at service.POITestEva.main(POITestEva.java:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Process finished with exit code 0

Answer 3

<apache.poi.version>3.16</apache.poi.version>

------------------------------------------------------------------------

D5      =SUM(C18:C20)

C18     =IFERROR(SUM(C31:32)
C19     =SUM(C33:34)
C20     =SUM(C35:36)

C31-C36 → next Formel etc.

-----------------------------------------------------------------------------