下载文件

download(@Res() res:Response){
  const url = 'url.png'
  res.download(url)
}

npm install compressing

import { zip } from 'compressing';
@get()
async download(@Res() res:Response){
  const url = join(__dirname, 'image/1747291958149.jpg')
  const tarStream = new zip.Stream()
  await tarStream.addEntry(url)
  res.setHeader('Content-Type','application/octet-stream')
  res.setHeader('Content-Disposition','attachment;filename=alrcly')
  tarStream.pipe(res)
}

不要直接操作响应对象

在 NestJS 中，如可以，不要直接操作响应对象（@Res）。有需要可以使用 @Headers() 、@HttpCode() 这样的装饰器。文件下载，使用面向响应式的方式处理文件 StreamableFile()

import { StreamableFile } from '@nestjs/common';
import { zip } from 'compressing';
@get()
@Header('Content-Type','application/octet-stream')
@Header('Content-Disposition','attachment;filename=alrcly')
async download(){
  const url = join(__dirname, 'image/1747291958149.jpg')
  const tarStream = new zip.Stream()
  await tarStream.addEntry(url)
  return new StreamableFile(tarStream)
}

import { StreamableFile } from '@nestjs/common';
import { createReadStream } from 'fs';
async down() {
  const url = join(__dirname, 'image/1747291958149.jpg')
  const file = createReadStream(url)
  return new StreamableFile(file)
}

扩展知识，前端如何接收流文件

const useFetch = async (url) => {
  const res = await fetch(url).then((res) => res.arrayBuffer())
  const blob = new blob([res])
  const phoneURL = URL.createObjectURL(blob)
  const a = document.createElement('a')
  a.href = phoneURL
  a.download = 'name.zip'
  a.click()
}