HarmonyOS文件上传怎么写

// 获取到相册选择图片的URI 
const PERMISSIONS: Array<Permissions> = [ 
  'ohos.permission.READ_MEDIA', 
  'ohos.permission.WRITE_MEDIA' 
]; 
let context = getContext(this) as common.UIAbilityContext 
let atManager = abilityAccessCtrl.createAtManager(); 
await atManager.requestPermissionsFromUser(context,PERMISSIONS) 
const photoSelectOption = new picker.PhotoSelectOptions() 
photoSelectOption.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE 
photoSelectOption.maxSelectNumber = 2 
const photoViewPicker = new picker.PhotoViewPicker 
photoViewPicker.select(photoSelectOption).then(async (photoSelectResult) => { 
  this.uris = photoSelectResult.photoUris 
}).catch((err: BusinessError) => { 
  console.info('Invoke photoViewPicker.select failed, code is ${err.code},message is ${err.message}'); 
}) 
axios上传类型支持uri和ArrayBuffer 
// 转化为internal://cache 
fs.open( this.uris[0], fs.OpenMode.READ_ONLY).then((file) => { // READ_ONLY READ_WRITE 
  let newPath = this.context.cacheDir + `/test.png`; 
  fs.copyFile(file.fd, newPath).then(() => { 
    console.info("applog:copy file succeed"); 
    let realUri = "internal://cache/"+newPath.split("cache/")[1]; 
    console.log('realUri'+JSON.stringify(realUri)) 
  }).catch((err:BusinessError) => { 
    console.info("applog:copy file failed with error message: " + err.message + ", error code: " + err.code); 
  }); 
}).catch((err:BusinessError) => { 
  console.info("applog:open file failed with error message: " + err.message + ", error code: " + err.code); 
}) 
// 转化为Arraybuffer 
let file = fs.openSync(this.uris[0], fs.OpenMode.READ_ONLY) 
const imageSource = image.createImageSource(file.fd); 
fs.closeSync(file) 
const imagePackApi = image.createImagePacker() 
let packOpts: image.PackingOption = { format: "image/png", quality: 100 } 
imagePackApi.packing(imageSource, packOpts) 
  .then(readBuffer => { 
    let bufferArr = new Uint8Array(readBuffer); 
    console.log('bufferArr'+JSON.stringify(bufferArr)) 
  }) 
let file = fs.openSync(uris[0], fs.OpenMode.READ_ONLY); 
let file2 = fs.openSync(this.filesDir + '/test.jpg', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
fs.copyFileSync(file.fd, file2.fd);//先创建有读写权限的文件，再把不可读写的文件复制过来 
fs.closeSync(file); fs.closeSync(file2)