一、download直接下载

1、添加下载代码

uploadController.ts

import { Controller, Get, Post, Body, Patch, Param, Delete, UseInterceptors, UploadedFile, Res } from '@nestjs/common';
import { UploadService } from './upload.service';
import { CreateUploadDto } from './dto/create-upload.dto';
import { UpdateUploadDto } from './dto/update-upload.dto';
import { FileInterceptor } from '@nestjs/platform-express';
import type { Response } from 'express';
import { join } from 'path';@Controller('upload')
export class UploadController {constructor(private readonly uploadService: UploadService) { }@Post()@UseInterceptors(FileInterceptor('file')) // 'file'为前端表单字段名称async uploadFile(@UploadedFile() file) {console.log('file', file);console.log(`${file.originalname} uploaded successfully.`);return `Successfully uploaded ${file.originalname}`;}@Get('export')downLoad(@Res() res: Response) {const url = join(__dirname, '../images/1705545207094.jpg');res.download(url);}
}

 

2、apifox调用下载图片接口

 二、使用文件流的方式实现下载

1、uploadControl.ts

import { Controller, Get, Post, Body, Patch, Param, Delete, UseInterceptors, UploadedFile, Res } from '@nestjs/common';
import { UploadService } from './upload.service';
import { CreateUploadDto } from './dto/create-upload.dto';
import { UpdateUploadDto } from './dto/update-upload.dto';
import { FileInterceptor } from '@nestjs/platform-express';
import type { Response } from 'express';
import { zip } from 'compressing';
import { join } from 'path';@Controller('upload')
export class UploadController {constructor(private readonly uploadService: UploadService) { }@Post()@UseInterceptors(FileInterceptor('file')) // 'file'为前端表单字段名称async uploadFile(@UploadedFile() file) {console.log('file', file);console.log(`${file.originalname} uploaded successfully.`);return `Successfully uploaded ${file.originalname}`;}@Get('export')downLoad(@Res() res: Response) {const url = join(__dirname, '../images/1705545207094.jpg');res.download(url);}@Get('stream')async down(@Res() res:Response) {const url = join(__dirname, '../images/1705545207094.jpg');const tarStream = new zip.Stream();await tarStream.addEntry(url);res.setHeader('Content-type', 'application/octet-stream');res.setHeader('Content-Disposition','attachment; filename=test');tarStream.pipe(res);}
}

2、web端实现接口调用 

<template><div class="container" @click="download">下载图片</div>
</template><script setup>const download = async () => {const url = '/api/upload/stream';const res = await fetch(url).then(res => res.arrayBuffer());console.log('res', res);const a = document.createElement('a');a.href = URL.createObjectURL(new Blob([res], {}));a.download = 'test.zip';a.click();a.remove();
};</script><style lang="scss" scoped>
.container{margin: 20px;background: yellowgreen;padding: 10px 20px;font-size: 16px;cursor: pointer;color: #fff;border-radius: 3px;transition: all 0.3s;&:hover{background: #35cd32;}
}
</style>

3、效果截图