//导出Excel            try {                HSSFWorkbook wb = carService.export(list);  //调用service方法~!                response.setContentType("application/vnd.ms-excel");                  response.setHeader("Content-disposition", "attachment;filename=carsList.xls");                  OutputStream ouputStream = response.getOutputStream();                  wb.write(ouputStream);                  ouputStream.flush();                  ouputStream.close();             } catch (Exception e) {                    logger.error("车辆信息导出excel错误:", e);            }              return null;//导出zip文件//response.reset();                          response.setCharacterEncoding("utf-8");                        response.setContentType("application/octet-stream;charset=UTF-8");                        response.setHeader("Content-Disposition", "attachment; filename=\"" + zipName + "\"");                           InputStream is = new FileInputStream(zipFile);     //是文件而不是文件名。                        FileCopyUtils.copy(is, response.getOutputStream());//将文件写到输出流中                        return null;