public static <T> void exportDownBoxExcel(String fileName, String sheetName,Class<T> t, String titleName, List<List<String>> headers, HttpServletResponse response, Map<Integer, List<String>> selectMap,List<T> dataList, boolean isExportNullField) {
        ServletOutputStream outputStream = null;
        try {
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");
            // 這里URLEncoder.encode可以防止中文亂碼 當然和easyexcel沒有關系
            String fileNameEncode = URLEncoder.encode(fileName, "UTF-8");
            response.setHeader("Content-disposition", "attachment;filename=" + fileNameEncode + ExcelTypeEnum.XLSX.getValue());
            outputStream = response.getOutputStream();
            EasyExcelFactory.write(outputStream, t)
                    .registerWriteHandler(new SelectSheetWriteHandler(selectMap))
                    //設置表頭樣式
                    .registerWriteHandler(getHorizontalCellStyleStrategy())
                    // 重寫AbstractColumnWidthStyleStrategy策略的setColumnWidth方法
                    .registerWriteHandler(new AbstractColumnWidthStyleStrategy() {
                        @Override
                        protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
                            Sheet sheet = writeSheetHolder.getSheet();
                            int columnIndex = cell.getColumnIndex();
                            // 列寬16
                            sheet.setColumnWidth(columnIndex, (short) 16);
                        }
                    })
                    .excelType(ExcelTypeEnum.XLSX)
//                  .head(headers)
                    .sheet(sheetName)
                    .doWrite(dataList);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (outputStream != null) {
                    outputStream.flush();
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }