基于FastAPI的文件上传和下载

news2025/1/21 15:28:06

基于FastAPI的文件上传和下载

一、前言

为了实现ASR的可视化界面，在各个博客中寻觅了一波找找文件上传和下载的例子，没有找到能完整实现这个功能的，有也只是有一部分（菜菜求捞捞），看了甚是烦恼，后来找gpt大爷来回交互了几下，把功能实现了。记录一下过程。

二、实现步骤

对了，能来查这个问题的兄弟，默认你对fastapi有了解了hh，就不多介绍了，单刀直入主题，怎么实现功能。

1、环境配置

这个功能实现涉及到三个库： fastapi、uvicorn、 requests。

pip install fastapi uvicorn requests -i
https://pypi.tuna.tsinghua.edu.cn/simple

2、服务端代码

文件名：upload.py

import os.path

import uvicorn

from fastapi import FastAPI, File, UploadFile
from fastapi.responses import FileResponse

app = FastAPI()

@app.get("/")
async def hello():

    return {"ret": 'hello'}

@app.post("/uploadfile/")
async def create_upload_file(file: UploadFile = File(...)):
    print(file)
    if not os.path.exists('uploaded_files'):
        os.mkdir('uploaded_files')
    with open(f"uploaded_files/{file.filename}", "wb") as f:
        f.write(await file.read())
    return {"filename": file.filename}

@app.get("/downloadfile/{filename}")
async def download_file(filename: str):
    file_path = f"uploaded_files/{filename}"
    return FileResponse(file_path, media_type="application/octet-stream", filename=filename)


if __name__ == '__main__':
    uvicorn.run('upload:app', host='127.0.0.1', port=18005, reload=True)

运行结果参考：
在这里插入图片描述

3、客户端代码

import os

import requests
def upfile(file_path):
    url = "http://127.0.0.1:18005/uploadfile/"

    try:
        with open(file_path, "rb") as f:
            files = {"file": (file_path, f)}
            response = requests.post(url, files=files)

        if response.status_code == 200:
            print(response.json())
            return True
        else:
            print(f"Request failed with status code {response.status_code}")
            return False
    except Exception as e:
        print(e)
        return False
def download(fileName):
    url = "http://127.0.0.1:18005/downloadfile/{}".format(fileName)
    try:
        res=requests.get(url)
        if res.status_code==200:
            with open(fileName,'wb') as w:
                w.write(res.content)

            return True
        else:

            return False
    except Exception as e:
        print(e)
        return False
def main():
    file_path = r"C:\Users\Admin\Pictures\LesNo2Text.png"

    upfile(file_path)
    fileName=os.path.basename(file_path)
    print('待下载的文件名字：'.format(fileName))
    ret=download(fileName)
    if ret:
        print('下载成功：' + fileName)
    else:
        print('下载失败：'+fileName)
if __name__=="__main__":
    main()