vue+springboot 前后端分离 上传文件处理后再下载，并且传递参数

vue代码

<template>
  <div>
    <input type="file" ref="fileInput" accept=".json"/>
    <el-button @click="upload">上传</el-button>
  </div>
</template>

<script>
export default {
  name: "Upgrade",
  data() {
    return {}
  },
  methods: {
    upload() {
      const files = this.$refs.fileInput.files
      var formData = new FormData();
      let config = {
        headers: {
          "Content-Type": "multipart/form-data",
        },
        responseType: "blob", //这个很重要
      };
      formData.append("file", files[0]);
      formData.append("fromVersion", "3.2.1")
      formData.append("toVersion", "4.0.0")
      this.axios.post("/upgrade/apiConfig", formData, config).then((response) => {
        const link = document.createElement("a");
        let blob = new Blob([response.data], {type: "application/x-msdownload"});
        link.style.display = "none";
        link.href = URL.createObjectURL(blob);
        link.setAttribute("download", "apiConfig.json");
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      });
    }
  }
}
</script>


<style scoped lang="less">

</style>

springboot代码

    @RequestMapping(value = "/apiConfig", produces = "application/json;charset=UTF-8")
    public void convertApiConfig(@RequestParam("file") MultipartFile file, @RequestParam("fromVersion") String fromVersion, @RequestParam("toVersion") String toVersion, HttpServletResponse response) {

        OutputStream os = null;
        try {
            String s = IOUtils.toString(file.getInputStream(), "utf-8");
            String content = upgradeService.upgradeApiConfig(s, fromVersion, toVersion);

            response.setContentType("application/x-msdownload;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment; filename=api_config.json");
            os = response.getOutputStream();
            os.write(content.getBytes("utf-8"));
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (os != null)
                    os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }