当使用Apache-POI库获取单元格内容时,我得到"无法从文本单元格中获取数值",反之亦然.我如何解决它？

import org.apache.poi.ss.usermodel.*;

public class ExcelReader {
    public static void main(String[] args) {
        Workbook workbook = WorkbookFactory.create(new File("example.xlsx"));
        Sheet sheet = workbook.getSheetAt(0);
        Row row = sheet.getRow(0);
        Cell cell = row.getCell(0);

        String cellValue = "";
        if (cell != null) {
            switch (cell.getCellType()) {
                case STRING:
                    cellValue = cell.getStringCellValue();
                    break;
                case NUMERIC:
                    if (DateUtil.isCellDateFormatted(cell)) {
                        cellValue = cell.getDateCellValue().toString();
                    } else {
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                case FORMULA:
                    cellValue = cell.getCellFormula();
                    break;
                case BOOLEAN:
                    cellValue = String.valueOf(cell.getBooleanCellValue());
                    break;
                default:
                    cellValue = "";
            }
        }

        System.out.println("单元格内容：" + cellValue);
    }
}