private List<List<String>> getHeader(List<ProductCategory> categories) {final String mainHead = LocalDateTimeUtil.format(LocalDateTime.now(), "yyyy年MM月dd日") + "XXX";List<String> head1 = new ArrayList<>();head1.add(mainHead);head1.add("区域");List<String> head2 = new ArrayList<>();head2.add(mainHead);head2.add("序号");List<String> head3 = new ArrayList<>();head3.add(mainHead);head3.add("用户");List<String> head4 = new ArrayList<>();head4.add(mainHead);head4.add("具体 ");List<List<String>> resHead = new ArrayList<>();resHead.add(head1);resHead.add(head2);resHead.add(head3);resHead.add(head4);for (int i = 1; i < 9; i++) {List<String> head5 = new ArrayList<>();head5.add(mainHead);head5.add("明细");head5.add(i);resHead.add(head5);}return resHead;}

使用

//表头List<List<String>> header = this.getHeader(categories);      //写入表头EasyExcel.write(outputStream).head(header).sheet().doWrite(dataList);}

效果图