APACHE POI 4.1 :从十六进制代码设置单元格背景颜色

import org.apache.poi.ss.usermodel.*;

public class SetCellBackgroundColorExample {
    public static void main(String[] args) {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Sheet1");
        
        // 创建单元格样式
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillForegroundColor(IndexedColors.RED.getIndex());
        cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        
        // 创建单元格并设置样式
        Row row = sheet.createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("Hello");
        cell.setCellStyle(cellStyle);
        
        // 保存Excel文件
        try {
            FileOutputStream outputStream = new FileOutputStream("example.xlsx");
            workbook.write(outputStream);
            workbook.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}