row_ = my_worksheet.createRow((short) y);
row_.createCell(x).setCellValue(temp.getText());

 Row row = sheet.getRow(2);
    Cell cell = row.getCell(3);
    if (cell == null)
        cell = row.createCell(3);

 cell_new  = row_.getCell(x);
                if (cell_new == null)
                {
                    cell_new = row_.createCell(x);
                    cell_new.setCellValue(cell1.getText());
                }
                else
                {
                    cell_new.setCellValue(cell1.getText());
                }

 row_  = my_worksheet.getRow((short) y);
            if (row_ == null)
            {
                row_ = my_worksheet.createRow((short) y); //берем строку
            }