HarmonyOS 鸿蒙Next 如何通过一个文档的下载链接 将文档下载至应用目录内

暂时没有根据下载链接查询下载任务的Api，有需求的话，可以使用key-value进行保存

文件的上传下载可参考文档: https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V13/js-apis-request-V13

报401是401 参数检查失败，详细参考:

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V13/errorcode-universal-V13#section401-参数检查失败

参考下以下demo：

import { BusinessError, request } from '[@kit](/user/kit).BasicServicesKit';

import fs from '[@ohos](/user/ohos).file.fs';

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Index {
 [@State](/user/State) message: string = 'Hello World';
 api9_task: request.DownloadTask | undefined;
 downLoad = async () => {

   let downUrl =
     "https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E5%9B%BE%E7%89%87&step_word=&hs=0&pn=32&spn=0&di=7375936315981824001&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3324321790%2C325371109&os=3708118008%2C3566968155&simid=4282501645%2C823704451&adpicid=0&lpn=0&ln=1737&fr=&fmq=1721286234192_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fimage109.360doc.com%2FDownloadImg%2F2021%2F09%2F1409%2F230310966_1_20210914091333446%26refer%3Dhttp%3A%2F%2Fimage109.360doc.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1723878237%26t%3D46a16ced985317cee6ab5df08a743e4c&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bnma15v_z%26e3Bv54AzdH3Fv5gpjgpAzdH3Fd8AzdH3Fal89AzdH3FalAzdH3Fdncclaa_llc98dmd9_z%26e3Bfip4s&gsm=1e&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCwzLDEsMiw2LDQsNSw4LDcsOQ%3D%3D&lid=7873798213617569258"

   try {

     let filePath = getContext().cacheDir + "/test6666";

     let isHas = await fs.access(filePath);

     if (isHas) {

       await fs.unlink(filePath);

     }

     request.downloadFile(getContext(), {
       url: downUrl, header: {

         'User-Agent': 'Chrome/124.0.0.0',

       }, filePath: filePath
     }).then((data: request.DownloadTask) => {

       let downloadTask: request.DownloadTask = data;

       let progressCallback = (receivedSize: number, totalSize: number) => {

         console.info("download receivedSize:" + receivedSize + " totalSize:" + totalSize);

       };

       downloadTask.on('progress', progressCallback);

       downloadTask.getTaskInfo().then((downloadInfo: request.DownloadInfo) => {

         console.info('Succeeded in querying the download task')

       }).catch((err: BusinessError) => {

         console.error(`Failed to query the download task. Code: ${err.code}, message: ${err.message}`)

       });

       let complateCallback = () => {

         console.info("download success-----.");

       };

       downloadTask.on('complete', complateCallback);

       let failCallback = (e: number) => {

         console.info(`download fail----- ${e}.`);

       };

       downloadTask.on('fail', failCallback);

     }).catch((err: BusinessError) => {

       console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);

     })

   } catch (err) {

     console.error(`Failed to request the download. err: ${JSON.stringify(err)}`);

   }

 }

 build() {

   RelativeContainer() {

     Text(this.message)

       .id('HelloWorld')

       .fontSize(50)

       .fontWeight(FontWeight.Bold)

       .alignRules({

         center: { anchor: '__container__', align: VerticalAlign.Center },

         middle: { anchor: '__container__', align: HorizontalAlign.Center }

       })
       .onClick(this.downLoad)

   }

   .height('100%')

   .width('100%')

 }
}

可以使用新的api：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-request-V5#requestagentcreate10