[alibaba/easyexcel]拦截器修改标题样式无效

简单写入, 指定拦截器, 修改标题样式. 无效

触发Bug的代码

  public class Demo {

    @Data
    static class DemoModel {
        @ExcelProperty(value = "数字标题", index = 0)
        private Integer number;
        @ExcelProperty(value = "字符串标题", index = 1)
        private String str;
    }

    static class Demo1Handler extends AbstractCellWriteHandler {
        @Override
        public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
            // 把字符串标题那一列的内容变为红色(正常)
            if (!isHead && cell.getColumnIndex() == 1) {
                XSSFCellStyle xssfCellStyle = (XSSFCellStyle) writeSheetHolder.getSheet().getWorkbook().createCellStyle();
                Font font = writeSheetHolder.getSheet().getWorkbook().createFont();
                font.setColor(Font.COLOR_RED);
                xssfCellStyle.setFont(font);
                cell.setCellStyle(xssfCellStyle);
            }
        }
    }

    static class Demo2Handler extends AbstractCellWriteHandler {
        @Override
        public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
            // 把字符串标题变为红色(无效)
            if (isHead && cell.getColumnIndex() == 1) {
                XSSFCellStyle xssfCellStyle = (XSSFCellStyle) writeSheetHolder.getSheet().getWorkbook().createCellStyle();
                Font font = writeSheetHolder.getSheet().getWorkbook().createFont();
                font.setColor(Font.COLOR_RED);
                xssfCellStyle.setFont(font);
                cell.setCellStyle(xssfCellStyle);
            }
        }
    }

    @Test
    public void fun() throws Exception {
        String data = "[{\"number\":1,\"str\":\"字符串内容1\"},{\"number\":2,\"str\":\"字符串内容2\"}]";
        ArrayList<DemoModel> listData = JSON.parseObject(data, new TypeReference<ArrayList<DemoModel>>() {
        });
        EasyExcel.write(new FileOutputStream("D:\\demo1.xlsx"), DemoModel.class)
                .registerWriteHandler(new Demo1Handler())
                .sheet()
                .doWrite(listData);
        EasyExcel.write(new FileOutputStream("D:\\demo2.xlsx"), DemoModel.class)
                .registerWriteHandler(new Demo2Handler())
                .sheet()
                .doWrite(listData);
    }
}

提示的异常或者没有达到的效果

标题样式仍然是默认样式. 拦截器修改的样式不生效