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Код


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

// Здесь в ячейки записываются новые значения

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

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

// Здесь из ячеек вычитываются новые значения, 
после того как Excel перерешает с новыми значениями

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

// «Ломается» на ячейке в которой стоит: =C34

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)

Код


import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;

public class POITest {

    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("C:/Test/1.xlsm");
        XSSFWorkbook workbook = new XSSFWorkbook(fis);
        XSSFSheet sheet = workbook.getSheetAt(1);
        CellReference ref = new CellReference("D5");
        int row = ref.getRow();
        int col = ref.getCol();
        Cell cell = sheet.getRow(row).getCell(col);
        gettingTheCellContents(ref, cell);
        fis.close();
        workbook.close();
    }

    // https://poi.apache.org/spreadsheet/quick-guide.html#CellContents
    private static void gettingTheCellContents(CellReference cellRef, Cell cell) {

        DataFormatter formatter = new DataFormatter();
        System.out.print(cellRef.formatAsString());
        System.out.print(" - ");

        // get the text that appears in the cell by getting the cell value and applying any data formats (Date, 0.00, 1.23e9, $1.23, etc)
        String text = formatter.formatCellValue(cell);
        System.out.println(text);

        // Alternatively, get the value and format it yourself
        switch (cell.getCellTypeEnum()) {
            case STRING:
                System.out.println(cell.getRichStringCellValue().getString());
                break;
            case NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    System.out.println(cell.getDateCellValue());
                } else {
                    System.out.println(cell.getNumericCellValue());
                }
                break;
            case BOOLEAN:
                System.out.println(cell.getBooleanCellValue());
                break;
            case FORMULA:
                System.out.println(cell.getCellFormula());
                break;
            case BLANK:
                System.out.println();
                break;
            default:
                System.out.println();
        }
    }
    
}

Код


import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;

public class POITest {

    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("C:/Test/1.xlsm");
        XSSFWorkbook workbook = new XSSFWorkbook(fis);
        XSSFSheet sheet = workbook.getSheetAt(1);
        CellReference ref = new CellReference("D5");
        int row = ref.getRow();
        int col = ref.getCol();
        Cell cell = sheet.getRow(row).getCell(col);
        gettingTheCellContents(ref, cell);
        fis.close();
        workbook.close();
    }

    // https://poi.apache.org/spreadsheet/quick-guide.html#CellContents
    private static void gettingTheCellContents(CellReference cellRef, Cell cell) {

        DataFormatter formatter = new DataFormatter();
        System.out.print(cellRef.formatAsString());
        System.out.print(" - ");

        // get the text that appears in the cell by getting the cell value and applying any data formats (Date, 0.00, 1.23e9, $1.23, etc)
        String text = formatter.formatCellValue(cell);
        System.out.println(text);

        // Alternatively, get the value and format it yourself
        switch (cell.getCellTypeEnum()) {
            case STRING:
                System.out.println(cell.getRichStringCellValue().getString());
                break;
            case NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    System.out.println(cell.getDateCellValue());
                } else {
                    System.out.println(cell.getNumericCellValue());
                }
                break;
            case BOOLEAN:
                System.out.println(cell.getBooleanCellValue());
                break;
            case FORMULA:
                System.out.println(cell.getCellFormula());
                break;
            case BLANK:
                System.out.println();
                break;
            default:
                System.out.println();
        }
    }
    
}