java后台导出服务器的excel模板

1、前端可使用a标签导出：

     

@GetMapping("/downloadAddCardFtl")
   @ApiOperation("下载导卡OR分配卡模板")
   public void downloadFtl(HttpServletResponse response) {
      try {
         //获取要下载的模板名称
         String fileName = "导出模板.xls";
         // 设置要下载的文件的名称
         response.setHeader("Content-disposition", "attachment;filename=aaaa" + URLEncoder.encode(fileName, "UTF-8"));
         // 通知客服文件的MIME类型
         response.setContentType("application/vnd.ms-excel;charset=UTF-8");
         // 获取文件的路径
         String path = "https://img.com/exportFile/tenant/20200407/ad629c25781f615e287c3e4c7bc570c5/exportTenant_20200407192206496.xlsx";
         System.out.println(path);
         URL url = new URL(path);
         InputStream input = url.openStream();
         //FileInputStream input = new FileInputStream(path);
         OutputStream out = response.getOutputStream();
         byte[] b = new byte[1024];
         int len;
         while ((len = input.read(b)) != -1) {
            out.write(b, 0, len);
         }
         input.close();
      } catch (Exception e) {
         System.out.println("yichang!");
      }
   }

2、java后端