无法使用Apache POI读取xls文件的单元格颜色

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFColor;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;

import java.io.FileInputStream;
import java.io.IOException;

public class ReadExcelColor {
    public static void main(String[] args) {
        try {
            FileInputStream file = new FileInputStream("path/to/your/file.xls");
            Workbook workbook = new HSSFWorkbook(file);
            Sheet sheet = workbook.getSheetAt(0);

            for (Row row : sheet) {
                for (Cell cell : row) {
                    if (cell.getCellType() == CellType.STRING) {
                        System.out.println("Cell Value: " + cell.getStringCellValue());
                    } else if (cell.getCellType() == CellType.NUMERIC) {
                        System.out.println("Cell Value: " + cell.getNumericCellValue());
                    }

                    // 获取单元格样式
                    CellStyle cellStyle = cell.getCellStyle();
                    if (cellStyle instanceof HSSFCellStyle) {
                        HSSFCellStyle hssfCellStyle = (HSSFCellStyle) cellStyle;
                        short colorIndex = hssfCellStyle.getFillForegroundColor();
                        HSSFColor hssfColor = HSSFColor.getIndexHash().get(colorIndex);
                        if (hssfColor != null) {
                            short[] rgb = hssfColor.getTriplet();
                            System.out.println("Cell Color (RGB): " + rgb[0] + ", " + rgb[1] + ", " + rgb[2]);
                        }
                    }
                }
            }

            workbook.close();
            file.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}