myapp

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fastapi安装 ​

更新时间: 2025/6/21 本章字数: 0 字 预计阅读时长: 0 分钟

本章总结

安装 ​

sh
pip install fastapi
sh
pip install uvicorn

首页 ​

python
import uvicorn
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
async def root():
    return {"message": "Hello World"}

if __name__ == "__main__":
    try:
        uvicorn.run(app, host="127.0.0.1", port=9987)
    except KeyboardInterrupt:
        print("Server stop")

返回html ​

python
from fastapi import FastAPI, Request
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
import uvicorn


app = FastAPI()


# 需要在主目录下新建一个templates文件夹专门存放html文件
templates = Jinja2Templates(directory="templates")
# 新建一个static文件存放静态资源
app.mount("/static", StaticFiles(directory="static"), name="static")


@app.get("/")
async def home(request: Request):
    return templates.TemplateResponse("index.html", {"request": request})

if __name__ == "__main__":
    try:
        uvicorn.run(app, host="127.0.0.1", port=9987)
    except KeyboardInterrupt:
        print("Server stop")

自定义404页面 ​

python
@app.exception_handler(HTTP_404_NOT_FOUND)
async def custom_404_handler(request, exc):
    return JSONResponse(
        status_code=HTTP_404_NOT_FOUND,
        content={"code": 404, "message": "The page you are visiting does not exist！"}
    )

自定义405页面 ​

python
@app.exception_handler(HTTP_405_METHOD_NOT_ALLOWED)
async def custom_405_handler(request, exc):
    return JSONResponse(
        status_code=HTTP_405_METHOD_NOT_ALLOWED,
        content={"code": 405, "message": "The request method is not allowed！"}
    )

完整 ​

python
from fastapi import FastAPI, Request
from fastapi.staticfiles import StaticFiles
from fastapi.responses import  JSONResponse
from starlette.status import HTTP_404_NOT_FOUND, HTTP_405_METHOD_NOT_ALLOWED
import uvicorn


app = FastAPI()



@app.exception_handler(HTTP_404_NOT_FOUND)
async def custom_404_handler(request, exc):
    return JSONResponse(
        status_code=HTTP_404_NOT_FOUND,
        content={"code": 404, "message": "The page you are visiting does not exist！"}
    )


@app.exception_handler(HTTP_405_METHOD_NOT_ALLOWED)
async def custom_405_handler(request, exc):
    return JSONResponse(
        status_code=HTTP_405_METHOD_NOT_ALLOWED,
        content={"code": 405, "message": "The request method is not allowed！"}
    )



if __name__ == "__main__":
    try:
        uvicorn.run(app, host="127.0.0.1", port=9987)
    except KeyboardInterrupt:
        print("Server stop")