File file = new File("/path/simple.csv");

List<List<String>> head = List.of(
      List.of("No"),
      List.of("Name"),
      List.of("Age")
);

List<List<String>> data = List.of(
      List.of("1", "Jackson", "20"),
      List.of("2", "Tom", "21"),
      List.of("3", "Sophia", "20")
);

FastExcel.write(file)
      .head(head)
      .registerWriteHandler(new CustomCsvWorkbookWriteHandler())
      .csv()
      .doWrite(data);

@Slf4j
public class CustomCsvWorkbookWriteHandler implements WorkbookWriteHandler {
      @Override
      public void afterWorkbookDispose(WorkbookWriteHandlerContext context) {
         WriteWorkbookHolder workbook = context.getWriteWorkbookHolder();

         Sheet sheet = workbook.getWorkbook().getSheetAt(0);

         Row row = sheet.getRow(0);
         // expected to return the "Age" column CsvCell object here
         Cell cell = row.getCell(2);

         log.info("Header name is: {}", cell.getStringCellValue());
      }
   }
}