用easypoi導出excel要合並列的方法

@ResponseBody
    @RequestMapping(value = "excelOut")
    public String excelOut(HttpServletRequest request, HttpServletResponse response) {

        //建立一個模板所在文件夾及名稱template/test.xlsx
        TemplateExportParams params = new TemplateExportParams("template/test.xlsx", 0, 1);
        Map<String, Object> map = new HashMap<>();

        List<Map<String, String>> headList = new ArrayList<>();
　　　　　//這是活動表頭,如果用戶要設置的列數是不固定的,則在這里設定,如取一個list中對象作為多個列
        for (int i = 0; i < 3; i++) {
            Map<String, String> m = new HashMap<>();
            m.put("name", "自定義表頭" + i);
            m.put("code", "t.code" + i);
            headList.add(m);
        }
        map.put("head", headList);
　　　　　//組裝數據
        List<Map<String, Object>> list = new ArrayList<>();
        for (int i = 0; i < 8; i++) {
            int s = new Random().nextInt(5) + 2;
            for (int k = 0; k < s; k++) {
                Map<String, Object> m = new HashMap<>();
                m.put("g1", "id" + i);
                m.put("g2", "2固定值" + i+(i % 2 == 0 ? "" : "\t"));

                m.put("g3", "3固定值" + i);
                for (int j = 0; j < 3; j++) {
                    m.put("code" + j, i + "code" + j);
                }
                m.put("list_sex", i + "sex" + k);
                list.add(m);
            }
        }
        map.put("rows", list);

        params.setColForEach(true);

        Workbook workbook = ExcelExportUtil.exportExcel(params, map);
        //需要合並的列,相當的數據就會合並,不合並則加(i % 2 == 0 ? "" : "\t")
        PoiMergeCellUtil.mergeCells(workbook.getSheetAt(0), 3, 0, 1, 2, 3, 4, 5, 6, 7, 8);

//        FileOutputStream fos = new FileOutputStream("D:/test"+System.currentTimeMillis()+".xlsx");//存在本地磁盤
//        workbook.write(fos);
//        fos.close();
        //設置保存的文件名
        String fileName = DateUtils.getYear() + "年" + DateUtils.getMonth() + "月" + DateUtils.getDay() + "日數據表_" + System.currentTimeMillis() + ".xlsx";
        //在瀏覽器中保存導出
        response.reset();
        response.setContentType("application/octet-stream");
        try {
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            ServletOutputStream outputStream = response.getOutputStream();
            workbook.write(outputStream);
            outputStream.flush();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }


//模板圖片,可根據自己需要更改

 //建立一個模板所在文件夾及名稱template/test.xlsx