read and write excel

// create and write new file *.xls
    private void writeFileExcel(String filePath, Object[][] data) {
        WritableWorkbook workbook;
        // create workbook
        try {
            workbook = Workbook.createWorkbook(new File(filePath));

            // create sheet
            WritableSheet sheet1 = workbook.createSheet("KTPM K10B", 0);

            // create Label and add to sheet
            sheet1.addCell(new Label(0, 0, "DANH SÁCH SINH VIÊN TIÊU BIỂU"));

            // row begin write data
            int rowBegin = 2;
            int colBegin = 0;

            for (int row = rowBegin, i = 0; row < data.length + rowBegin; row++, i++) {
                for (int col = colBegin, j = 0; col < data[0].length + colBegin; col++, j++) {

                    Object obj = data[i][j];
                    // write a string to cell
                    if (obj instanceof String)
                        sheet1.addCell(new Label(col, row, (String) data[i][j]));
                    // write a integer number to cell
                    else if (obj instanceof Integer)
                        sheet1.addCell(new Number(col, row,
                                (Integer) data[i][j]));
                    // write a double number to cell
                    else if (obj instanceof Double)
                        sheet1.addCell(new Number(col, row, (Double) data[i][j]));
                }
            }
            // write file
            workbook.write();

            // close
            workbook.close();
        } catch (IOException e) {
            System.out.println("Error create file\n" + e.toString());
        } catch (RowsExceededException e) {
            System.out.println("Error write file\n" + e.toString());
        } catch (WriteException e) {
            System.out.println("Error write file\n" + e.toString());
        }
        System.out.println("create and write success");
    }