如何从Excel中以科学计数法获得数字？

Question

我有一个科学计数法数字，表示

科学符号编号存储在Excel工作表中，我需要将2.97112E + 13转换为其原始编号。我尝试了两个都不起作用：

int val = new BigDecimal().intValue();
ouput  -1383753728

和

String val = new BigDecimal("2.97112E+13").toPlainString();
output  29711200000000

这是我的代码：

 Workbook workbook = WorkbookFactory.create(new File(SAMPLE_XLSX_FILE_PATH));
            int trys=0;
     Boolean flag=true;
        // 1. You can obtain a sheetIterator and iterate over it
        Iterator<Sheet> sheetIterator = workbook.sheetIterator();

        while (sheetIterator.hasNext()) {
            Sheet sheet = sheetIterator.next();
           // System.out.println("=> " + sheet.getSheetName());
        }
        Sheet sheet = workbook.getSheetAt(0);

        String cellValue=" ";
        // Create a DataFormatter to format and get each cell's value as String
        DataFormatter dataFormatter = new DataFormatter();

        // 1. You can obtain a rowIterator and columnIterator and iterate over them
     //   System.out.println("\n\nIterating over Rows and Columns using Iterator\n");
        Iterator<Row> rowIterator = sheet.rowIterator();
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();

            // Now let's iterate over the columns of the current row
            Iterator<Cell> cellIterator = row.cellIterator();

            while (cellIterator.hasNext()) {

                Cell cell = cellIterator.next();

               Boolean h=true;

              String  cellValue = dataFormatter.formatCellValue(cell);

此处cellValue是存储单元格值的字符串