harmony 鸿蒙@system.request (Upload and Download)

  • 2022-08-09
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@system.request (Upload and Download)

The system.request module provides applications with basic upload and download capabilities.

NOTE - The APIs of this module are deprecated since API version 9. You are advised to use @ohos.request instead.

  • The initial APIs of this module are supported since API version 3. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import request from '@system.request';

request.upload

upload(options: UploadRequestOptions): void

Uploads a file. This API returns no value.

System capability: SystemCapability.MiscServices.Upload

Parameters

Name Type Mandatory Description
options UploadRequestOptions Yes Upload configurations.

Example

  import request, { UploadRequestOptions } from '@system.request';

  let uploadRequestOptions: UploadRequestOptions = {
    url: 'http://www.path.com',
    method: 'POST',
    files: [{
      filename: "test",
      name: "test",
      uri: "internal://cache/test.jpg",
      type: "jpg"
    }],
    data: [{
      name: "name123",
      value: "123"
    }],
    success: (data: object) => {
      console.info(' upload success, code:' + JSON.stringify(data));
    },
    fail: (data:string, code:number) => {
      console.info(' upload fail data: ' + data + 'code: ' + code);
    },
    complete: () => {
      console.info(' upload complete');
    }
  }

  try {
    request.upload(uploadRequestOptions);
    console.info('upload start ');
  } catch (err) {
    console.info(' upload err:' + err);
  }

UploadRequestOptions

System capability: SystemCapability.MiscServices.Upload

Name Type Mandatory Description
url string Yes URL of the upload server.
data Array<RequestData> No Form data in the request body.
files Array<RequestFile> Yes List of files to upload, which is submitted through multipart/form-data.
header Object No Request header.
method string No Request method, which can be ‘POST’ or ‘PUT’. The default value is POST.
success Function No Called when API call is successful.
fail Function No Called when API call has failed.
complete Function No Called when API call is complete.

success parameter |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|UploadResponse|Yes|Information returned when the upload task is successful.|

fail parameters |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|any|Yes|Header information returned when the upload task fails.| |code|number|Yes|HTTP status code returned when the upload task fails.|

UploadResponse

System capability: SystemCapability.MiscServices.Upload

Name Type Mandatory Description
code number Yes HTTP status code returned by the server.
data string Yes Content returned by the server. The value type is determined by the type in the returned headers.
headers Object Yes Headers returned by the server.

RequestFile

System capability: SystemCapability.MiscServices.Upload

Name Type Mandatory Description
filename string No File name in the header when multipart is used.
name string No Name of a form item when multipart is used. The default value is file.
uri string Yes Local path for storing files.
type string No Type of the file content. By default, the type is obtained based on the extension of the file name or URI.

RequestData

System capability: SystemCapability.MiscServices.Upload

Name Type Mandatory Description
name string Yes Name of the form element.
value string Yes Value of the form element.

request.download

download(options: DownloadRequestOptions): void

Downloads a file. This API returns no value.

System capability: SystemCapability.MiscServices.Download

Parameters

Name Type Mandatory Description
options DownloadRequestOptions Yes Download configurations.

Example

  import request, { DownloadRequestOptions } from '@system.request';

  let downloadRequestOptions: DownloadRequestOptions = {
    url: 'http://www.path.com',
    filename: 'requestSystenTest',
    header: "",
    description: 'this is requeSystem download response',
    success: (data:object) => {
      console.info(' download success, code:' + JSON.stringify(data));
    },
    fail: (data:string, code:number) => {
      console.info(' download fail data: ' + data + 'code: ' + code);
    },
    complete: () => {
      console.info(' download complete');
    }
  }

  try {
    request.download(downloadRequestOptions);
    console.info('download start ');
  } catch(err) {
    console.info(' download err:' + err);
  }

DownloadRequestOptions

System capability: SystemCapability.MiscServices.Download

Name Type Mandatory Description
url string Yes Resource URL.
filename string No Name of the file to download. The value is obtained from the current request or resource URL by default.
header Object No Request header.
description string No Download description. The default value is the file name.
success Function No Called when API call is successful.
fail Function No Called when API call has failed.
complete Function No Called when API call is complete.

success parameter |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|DownloadResponse|Yes|Information returned when the download task is successful.|

fail parameters |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|any|Yes|Header information returned when the download task fails.| |code|number|Yes|HTTP status code returned when the download task fails.|

DownloadResponse

System capability: SystemCapability.MiscServices.Download

Name Type Mandatory Description
token string Yes Download token, which is used to obtain the download status

request.onDownloadComplete

onDownloadComplete(options: OnDownloadCompleteOptions): void

Listens for download task status. This API returns no value.

System capability: SystemCapability.MiscServices.Download

Parameters

Name Type Mandatory Description
options OnDownloadCompleteOptions Yes Configurations of the download task.

Example

  import request, { OnDownloadCompleteOptions } from '@system.request';

  let onDownloadCompleteOptions: OnDownloadCompleteOptions = {
    token: 'token-index',
    success: (data:object) => {
      console.info(' download success, code:' + JSON.stringify(data));
    },
    fail: (data:string, code:number) => {
      console.info(' download fail data: ' + data + 'code: ' + code);
    },
    complete: () => {
      console.info(' download complete');
    }
  }

  request.onDownloadComplete(onDownloadCompleteOptions);

OnDownloadCompleteOptions

System capability: SystemCapability.MiscServices.Download

Name Type Mandatory Description
token string Yes Result token returned by the download API.
success Function No Called when API call is successful.
fail Function No Called when API call has failed.
complete Function No Called when API call is complete.

success parameter |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|OnDownloadCompleteResponse|Yes|Information returned when the download task is successful.|

fail parameters |Name|Type|Mandatory|Description| |——–|——–|——–|——–| |data|any|Yes|Header information returned when the download task fails.| |code|number|Yes|HTTP status code returned when the download task fails.|

OnDownloadCompleteResponse

System capability: SystemCapability.MiscServices.Download

Name Type Mandatory Description
uri string Yes URI of the download file.

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