解决方案 | RuntimeError: Directory ‘static‘ does not exist

在运行FastAPI项目时候，出现以下报错：

Process SpawnProcess-1:
Traceback (most recent call last):
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\multiprocessing\process.py", line 315, in _bootstrap
    self.run()
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\multiprocessing\process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\uvicorn\_subprocess.py", line 76, in subprocess_started
    target(sockets=sockets)
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\uvicorn\server.py", line 61, in run
    return asyncio.run(self.serve(sockets=sockets))
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\uvicorn\server.py", line 68, in serve
    config.load()
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\uvicorn\config.py", line 473, in load
    self.loaded_app = import_from_string(self.app)
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\uvicorn\importer.py", line 21, in import_from_string
    module = importlib.import_module(module_str)
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "", line 1014, in _gcd_import
  File "", line 991, in _find_and_load
  File "", line 975, in _find_and_load_unlocked
  File "", line 671, in _load_unlocked
  File "", line 783, in exec_module
  File "", line 219, in _call_with_frames_removed
  File "D:\WWW\CDCL\main.py", line 8, in 
    app.mount("/static", StaticFiles(directory="static"), name="static")
  File "c:\users\redmibook\appdata\local\programs\python\python38\lib\site-packages\starlette\staticfiles.py", line 57, in __init__
    raise RuntimeError(f"Directory '{directory}' does not exist")
RuntimeError: Directory 'static' does not exist

这个错误是因为在项目的根目录中找不到名为static的文件夹。FastAPI使用StaticFiles来提供静态文件（如CSS、JavaScript和图像），但在代码中尝试加载静态文件时发现找不到static文件夹。

需要确保在项目的根目录中创建一个名为static的文件夹，并将所需的静态文件放入其中。

请按照以下步骤修复错误：

1. 在项目的根目录中创建一个名为static的文件夹。

mkdir static

2. 将静态文件（如CSS文件、图像等）复制到static文件夹中。

3. 再次运行项目：

uvicorn main:app --reload

现在，应该能够成功加载静态文件，并且不再出现关于RuntimeError: Directory 'static' does not exist的错误。