Nestjs 图片下载

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);
    }
}

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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

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