根据模板导出excel

    @RequestMapping(value = "/export", method = RequestMethod.GET)
    public void exportApprovalsLog(
            @RequestParam(value = "department", required = false) String department,
            @RequestParam(value = "approver_ids", required = false) List<String> approverIds,
            @RequestParam(value = "start_time", required = false) Long startTime,
            @RequestParam(value = "end_time", required = false) Long endTime,
            @RequestParam(value = "case_code", required = false) String caseCode,
            HttpServletRequest request, HttpServletResponse response) {

        if (CollectionUtils.isEmpty(approverIds)) {
            approverIds = ImmutableList.of("777");
        }

        List<ApproveLog> list = service.getApprovalsLog(department, approverIds, startTime, endTime, caseCode, null,null);

        try {
            String path = request.getServletContext().getRealPath("")
                    + "/excelTemplate/审核记录.xls";   //这个是我的excel模板 根目录是wabapp
            InputStream in = new FileInputStream(new File(path));
            HSSFWorkbook work = new HSSFWorkbook(in);
            HSSFSheet sheet = work.getSheetAt(0);  // 获取sheet
            // 插入数据
            for (int i = 1; i < list.size() + 1; i++) { // 表头占1行 i=1; 表头占2行 i=2
                ApproveLog log = list.get(i - 1);
                HSSFRow row = sheet.createRow(i);

                HSSFCell cell = row.createCell(0);
                cell.setCellValue(log.getCaseId());
                cell1 = row.createCell(1);
                cell.setCellValue(log.getCaseName());
                // 其他数据
            }

            String fileName = ExportExcelUtils.makeFileName("审核记录", department,
                    ExportExcelUtils.getNamesByIds(constantService, approverIds), startTime, endTime);
            OutputStream os = response.getOutputStream();// 取得输出流
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition",
                    "attachment;filename=" + new String(fileName.getBytes("UTF-8"), "iso8859-1") + ".xls"); // 防止中文乱码
            work.write(os);
            os.close();
        } catch (FileNotFoundException e) {
            throw new BizException(ErrorCode.DATA_NOT_EXIST, "文件路径错误");
        } catch (IOException e) {
            e.printStackTrace();
            throw new BizException(ErrorCode.DATA_NOT_EXIST, "文件输入流错误");
        }
    }