*****如何得到excel单元格中的值而不是所含的公式？******

下面程序得到的结果是：
Sheet 1
Formula in B1 value:  0 formula: A1+A2为什么value为0？怎么得到97？
            Workbook wb=Workbook.getWorkbook(file);
            try
            {
                OutputStreamWriter osw = new OutputStreamWriter(System.out, "UTF8");
                BufferedWriter bw = new BufferedWriter(osw);
                ArrayList parseErrors = new ArrayList();
                Sheet s = wb.getSheet(0);
                bw.write(s.getName());
                bw.newLine();                Cell[] row = null;
                Cell c = null;                row = s.getRow(0);
                c = row[1];
                if (c.getType() == CellType.NUMBER_FORMULA ||
                    c.getType() == CellType.STRING_FORMULA ||
                    c.getType() == CellType.BOOLEAN_FORMULA ||
                    c.getType() == CellType.FORMULA_ERROR)
                {
                    FormulaCell nfc = (FormulaCell) c;
                    StringBuffer sb = new StringBuffer();
                    CellReferenceHelper.getCellReference(c.getColumn(), c.getRow(), sb);                    try
                    {
                        bw.write("Formula in "  + sb.toString() +
                                 " value:  " + c.getContents());
                        bw.flush();
                        bw.write(" formula: " + nfc.getFormula());
                        bw.flush();
                        bw.newLine();
                    }
                    catch (FormulaException e)
                    {
                        bw.newLine();
                        parseErrors.add(sb.toString() + ": " + e.getMessage());
                    }
                }