使用request下载文件的方式

// 将网络资源文件下载到应用文件目录
import { common } from '@kit.AbilityKit';
import { BusinessError, request } from '@kit.BasicServicesKit';

// 获取应用文件路径
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;

try {
  request.downloadFile(context, {
    url: 'https://xxxx/xxx.txt',
    filePath: filesDir + '/xxx.txt'
  }).then((downloadTask: request.DownloadTask) => {
    downloadTask.on('complete', () => {
      console.info(`DownloadFile download complete`);
    });
    downloadTask.on('progress', (receivedSize: number, totalSize: number) => {
      console.info(`DownloadFile totalSize: ${totalSize} ,downloadSize:${receivedSize}`);
    });
    downloadTask.on('fail', (err: number) => {
      console.info(`DownloadFile err: ${err}`);
    });
  }).catch((err: BusinessError) => {
    console.error(`DownloadFile Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`);
  });
} catch (e) {
  console.error(`DownloadFile Invoke downloadFile failed, code is ${e.code}, message is ${e.message}`);
}