vue使用el-upload上传文件及Feign服务间传递文件的方法

<el-upload class="step_content" drag
         action="string"
         ref="upload"
         :multiple="false"
         :http-request="createappversion"
         :data="appversion"
         :auto-upload="false"
         :limit="1"
         :on-change="onfileuploadchange"
         :on-remove="onfileremove">
    <i class="el-icon-upload"></i>
    <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>

</el-upload>

 <div class="mgt30">
    <el-button v-show="createappvisible" :disabled="createappdisable" type="primary" class="mgt30"
          @click="onsubmitclick">立即创建
    </el-button>
 </div>

....

 onsubmitclick() {
    this.$refs.upload.submit();
   },

   createappversion(param) {
    this.globalloading = true;

    const formdata = new formdata();
    formdata.append('file', param.file);
    formdata.append('appversion', json.stringify(this.appversion));

    addappversionapi(formdata).then(res => {
     this.globalloading = false;
     this.$message({message: '创建app verion 成功', type: 'success'});
     this.uploadfinish();
    }).catch(reason => {
     this.globalloading = false;
     this.showdialog(reason);
    })

   },

const formdata = new formdata();
formdata.append('file', param.file);
formdata.append('appversion', json.stringify(this.appversion));

 function httppostmutipartfileasyn(url, param) {
 return new promise((resolve, reject) => {
  request({
   url: url,
   headers: {
    'content-type': 'multipart/form-data'
   },
   method: 'post',
   data: param
  }).then(response => {
   if (response.data.status.code === 0) {
    resolve(response.data)
   } else {
    reject(response.data.status)
   }
  }).catch(response => {
   reject(response)
  })
 })
}

@postmapping("/version/add")
  public restresult addappversion(@requestparam("appversion") string appversion,
                  @requestparam("file") multipartfile multipartfile) {

    ....
    
    return new restresult();
  }

    <dependency>
      <groupid>io.github.openfeign.form</groupid>
      <artifactid>feign-form</artifactid>
      <version>3.0.3</version>
    </dependency>

    <dependency>
      <groupid>io.github.openfeign.form</groupid>
      <artifactid>feign-form-spring</artifactid>
      <version>3.0.3</version>
    </dependency>

    <dependency>
      <groupid>commons-fileupload</groupid>
      <artifactid>commons-fileupload</artifactid>
      <version>1.3.3</version>
    </dependency>

@feignclient(name = "resource-client",url = "http://xxxx",path = "resource",configuration = resourceservicefeignclient.multipartsupportconfig.class)
public interface resourceservicefeignclient {

  @postmapping(value = "/upload", consumes = mediatype.multipart_form_data_value)
  resource upload(@requestpart("file") multipartfile file);

  class multipartsupportconfig {
    @bean
    public encoder feignformencoder() {
      return new springformencoder();
    }
  }

}