如何实现下载断点续传？

Question

如何实现下载断点续传

Answer 1

断点续传的实现需要依赖于服务器，客户端仅支持通过设置下载的开始位置和结束位置来控制是否断点续传。

可参考如下示例代码：

import { BusinessError, request } from '@kit.BasicServicesKit'; 
 
// 配置信息 
let config: request.agent.Config = { 
  action: request.agent.Action.DOWNLOAD, 
  url: 'https://xxx', 
  title: 'taskOnTest', 
  description: 'Sample code for event listening', 
  mode: request.agent.Mode.FOREGROUND, 
  overwrite: false, 
  method: "GET", 
  data: '', 
  saveas: "./", 
  network: request.agent.Network.WIFI, 
  metered: false, 
  roaming: true, 
  retry: true, 
  redirect: true, 
  index: 0, 
  begins: 0, 
  ends: -1, 
  gauge: false, 
  precise: false, 
  token: "it is a secret" 
}; 
// 创建任务 
request.agent.create(getContext(), config).then((task: request.agent.Task) => { 
  // 订阅任务进度事件 
  task.on('progress', (progress: request.agent.Progress) => { 
    console.info('xxx upload task progress:' + progress); 
  }); 
  // 订阅任务完成事件 
  task.on('completed', (progress: request.agent.Progress) => { 
    console.info('xxx upload task completed:' + progress); 
  }); 
  // 订阅任务失败事件 
  task.on('failed', (progress: request.agent.Progress) => { 
    console.info('xxx upload task failed:' + progress); 
  }); 
  // 订阅任务启动事件 
  task.start(() => { 
    console.info('xxx start task success'); 
  }) 
  console.info(`xxx Succeeded in creating a upload task. result: ${task.tid}`); 
}).catch((err: BusinessError) => { 
  console.error(`xxx Failed to create a upload task, Code: ${err.code}, message: ${err.message}`); 
});