public class MyCellWriterHandler implements CellWriteHandler {
    @Override
    public void afterCellDispose(CellWriteHandlerContext context) {
        Cell cell = context.getCell();
        CellStyle cellStyle = cell.getCellStyle();
        if (cellStyle == null) {
            cellStyle = cell.getSheet().getWorkbook().createCellStyle();  // 创建新的样式
        }
        String sheetName = cell.getRow().getSheet().getSheetName();
       // 这里的代码已经简化了，就是对指定sheet页的指定单元格上背景色
        if (sheetName.equals("基础信息") && cell.getColumnIndex() == 0) {
            cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
            cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        }
        cell.setCellStyle(cellStyle);
    }
}

    public void write(ExcelWriter writer, W data) {
        init();
        for (Map.Entry<String, ExcelSheetAdapter<?>> entry : excelSheetMetaDataMap.entrySet()) {
            String sheetName = entry.getKey();
            WriteSheet writeSheet = EasyExcel.writerSheet(sheetName)
                    .needHead(true)
                    .registerWriteHandler(new MyCellWriterHandler())
                .build();
            writer.write(getData(data, classExcelSheetAdapterMap.getKey(entry.getValue())), writeSheet);
        }
        writer.finish();
    }