1 安装FastAPI

powershell
# python 3.8
pip install fastapi uvicorn python-multipart

2 简单的例子启动FastAPI服务

需要学习：

路由组织
CORS跨域问题
uvicorn启动

run1.py :

python
# -*- coding:utf-8 -*-
import uvicorn
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from test_ok import app03
app = FastAPI(
    title='FastAPI',
    description='FastAPI教程',
    version='1.0.0',
    docs_url='/docs',
    redoc_url='/redocs',
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
app.include_router(app03, prefix='/c3', tags=['test 3'])
@app.get("/hello")
async def path_params01():
    return {"hello world"}
if __name__ == '__main__':
    uvicorn.run('run1:app', host='0.0.0.0', port=8001, reload=True, debug=True, workers=1)

test_ok.py :

python
# -*- coding:utf-8 -*-
from fastapi import APIRouter
app03 = APIRouter()
@app03.get("/path/parameters")
def path_params01():
    return {"message": "This is a message"}

启动：

powershell
sudo /home/kevin_xie/miniconda3/envs/fastapi/bin/python run1.py

3 启动服务单一文件

run1.py :

python
# -*- coding:utf-8 -*-
import uvicorn
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
app = FastAPI(
    title='FastAPI Tutorial',
    description='FastAPI教程',
    version='1.0.0',
    docs_url='/docs',
    redoc_url='/redocs',
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
@app.get("/hello")
async def path_params01():
    return {"hello world"}
if __name__ == '__main__':
    uvicorn.run('run1:app', host='0.0.0.0', port=8001, reload=True, debug=True, workers=1)

启动：

powershell
sudo /home/kevin_xie/miniconda3/envs/fastapi/bin/python run1.py

3 使用UploadFile上传图片和表单

python
# -*- coding:utf-8 -*-
import uvicorn
from fastapi.middleware.cors import CORSMiddleware
from fastapi import FastAPI, File, Form, UploadFile
import cv2
import numpy as np
app = FastAPI(
    title='FastAPI Tutorial',
    description='FastAPI教程',
    version='1.0.0',
    docs_url='/docs',
    redoc_url='/redocs',
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
@app.post("/files/")
async def alg_file(
        fileb: UploadFile = File(...),
        token: str = Form(...)
):
    img = cv2.imdecode(np.fromstring(fileb.file.read(), np.uint8), cv2.IMREAD_COLOR)
    return {
        "token": token,
        "filename": fileb.filename,
        "content_type": fileb.content_type,
        "size": img.shape
    }
if __name__ == '__main__':
    uvicorn.run('run1:app', host='0.0.0.0', port=8001, reload=True, debug=True, workers=1)

在这里插入图片描述

4 使用File上传图片和表单

python
# -*- coding:utf-8 -*-
import uvicorn
from fastapi.middleware.cors import CORSMiddleware
from fastapi import FastAPI, File, Form, UploadFile
import cv2
import numpy as np
from io import BytesIO
app = FastAPI(
    title='FastAPI Tutorial',
    description='FastAPI教程',
    version='1.0.0',
    docs_url='/docs',
    redoc_url='/redocs',
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
@app.post("/files/")
async def alg_file(
        file: bytes = File(...),
        token: str = Form(...)
):
    img = cv2.imdecode(np.frombuffer(file, dtype=np.uint8), 1)
    return {
        "token": token,
        "size": img.shape
    }
if __name__ == '__main__':
    uvicorn.run('run1:app', host='0.0.0.0', port=8002, reload=True, debug=True, workers=1)