如何更改特定单元格 apache poi 3.9 的字体颜色

我可以在apache POI中的以下代码更改前景色。现在我想更改单个单元格的字体颜色。

CellStyle style = wb.createCellStyle();
                        style.setFillForegroundColor(IndexedColors.GREEN.getIndex());
                        style.setFillPattern(CellStyle.SOLID_FOREGROUND);
                        cell = rowxl.createCell((short) 7);
                        cell.setCellValue(" <<<<ONTRACK>>>>");
                        cell.setCellStyle(style);


                        rowxl.createCell(0).setCellValue(TEAM);

我已经尝试过这个，但它不会改变前两列的颜色

法典：

public class fclr {
     public static void main(String[] args)  throws Exception {

         InputStream inp = new FileInputStream("c:/workbook1.xls");
            Workbook wb = WorkbookFactory.create(inp);
            CreationHelper createHelper = wb.getCreationHelper();
            Sheet sheet = wb.getSheetAt(0);
            Row rowxl = sheet.createRow((short)0);


            Cell cell = rowxl.createCell(0);

            //apply some colors from the standard palette,
            // as in the previous examples.
            //we'll use red text on a lime background

            CellStyle style = wb.createCellStyle();


          rowxl.createCell(1).setCellValue("ABC");
        rowxl.createCell(2).setCellValue("aaa");
            Font font = wb.createFont();
            font.setColor(HSSFColor.BLACK.index);
            style.setFont(font);


            cell.setCellStyle(style);

            FileOutputStream fileOut = new FileOutputStream("c:/workbook1.xls");
            wb.write(fileOut);
            fileOut.close();



     }

}