HarmonyOS 鸿蒙Next如何实现上传本地图片到服务器

import axios, { AxiosError, AxiosResponse, FormData } from '@ohos/axios';
import { common } from '@kit.AbilityKit';
import fs from '@ohos.file.fs';

@Entry
@Component
struct UploadFilePage {
  @State message: string = 'Hello World';
  context = this as common.UIAbilityContext
  build() {
    RelativeContainer() {
      Button(this.message)
        .id('UploadFilePageHelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        }).onClick(async () =>{
        let uploadUrl = "xxxx"

        let rawFileDescriptor = this.context.resourceManager.getRawFdSync('exif.png')

        let buf2 = new ArrayBuffer(rawFileDescriptor.length);
        fs.readSync(rawFileDescriptor.fd, buf2); // 以同步方法从流文件读取数据。
        fs.fsyncSync(rawFileDescriptor.fd);
        fs.closeSync(rawFileDescriptor.fd);

        let formData = new FormData()
        formData.append('file',buf2)

        axios.post<string, AxiosResponse<string>,FormData>(uploadUrl, formData,{
          context: this.context,
          headers: {
            'Content-Type': 'multipart/form-data'
          },
        }).then((res: AxiosResponse) => {
          console.info("ImageUtils", "uploadPhoto", "success:" + JSON.stringify(res.data))
        }).catch((error: AxiosError) => {
          console.error("ImageUtils", "uploadPhoto", "error:" + JSON.stringify(error))
        })
      })
    }
    .height('100%')
    .width('100%')
  }
}