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");
         }
     }