是否可以动态生成大文件（10Gb）并将其流式传输到客户端？ [英] Is it possible to dynamically produce large files (10Gb) and stream them to the client?

问题描述

是否可以动态生成大型文件（10Gb +）供客户端下载？

Is it possible to dynamically produce large files (10Gb+) for the client to download?

我正在构建一个动态创建文件并将其下载到客户。我通过创建一个Blob数据并使用objectUrl来下载它们来实现这一点。

I'm building a webapp that dynamically creates files and downloads them to the client. I've implemented this by creating a Blob of data and using an objectUrl to download them.

（例如：下载大文件在达特朗）：

import 'dart:html';

void main() {
  var data = new Blob(['Hello World!\n'*1000000]);
  querySelector("#downloadLink")
      ..setAttribute('href', Url.createObjectUrl(data));
}

但是，这不适用于大文件。
有没有办法将文件传输到客户端，或者将数据附加到文件中，以便在下载之前可以逐个生成文件而不是生成整个文件？

However, this does not work for large files. Is there a way to stream files to the client, or append data to a file, so that the file can be generated piece by piece rather than generating the entire thing before downloading?

推荐答案

for< 800MB我建议 FileSaver 但是对于10GB +，你需要像 StreamSaver （它只适用于Blink doe）16GB +对我没有任何问题

for < 800MB i would recommend FileSaver but for 10GB+ you are going to need something like StreamSaver (It will only work in Blink doe) 16GB+ haven't been any problem for me

const fileStream = streamSaver.createWriteStream('filename.txt')
const writer = fileStream.getWriter()
const encoder = new TextEncoder()

// When you have any data you write it as Uint8array
let data = 'a'.repeat(1024)
let uint8array = encoder.encode(data + "\n\n")

writer.write(uint8array) // chunk
writer.write(uint8array) // chunk
writer.write(uint8array) // chunk
writer.write(uint8array) // chunk

// After you have written all bytes you need to close it
writer.close()

（只是不要一次写完所有块） ，随着你获得更多数据，逐步进行）

(just don't write all chunks at once, do it progressively as you get more data avalible)

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