django_自定義中間件報錯_ModuleNotFoundError: No module namdjango.core.exceptions.ImproperlyConfigured: WSGI

問題描述：

在使用django中間件攔截請求做處理的時候，自定義並配置好settings.py時候，報錯了。

如下

ModuleNotFoundError: No module named 'middleware'

System check identified no issues (0 silenced).
January 01, 2020 - 17:55:46
Django version 2.2.6, using settings 'project3.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "G:\anaconda\lib\site-packages\django\core\servers\basehttp.py", line 45, in get_internal_wsgi_application
    return import_string(app_path)
  File "G:\anaconda\lib\site-packages\django\utils\module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "G:\anaconda\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "F:\django_lear\project3\project3\wsgi.py", line 16, in <module>
    application = get_wsgi_application()
  File "G:\anaconda\lib\site-packages\django\core\wsgi.py", line 13, in get_wsgi_application
    return WSGIHandler()
  File "G:\anaconda\lib\site-packages\django\core\handlers\wsgi.py", line 135, in __init__
    self.load_middleware()
  File "G:\anaconda\lib\site-packages\django\core\handlers\base.py", line 35, in load_middleware
    middleware = import_string(middleware_path)
  File "G:\anaconda\lib\site-packages\django\utils\module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "G:\anaconda\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'middleware'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "G:\anaconda\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "G:\anaconda\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "G:\anaconda\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "G:\anaconda\lib\site-packages\django\core\management\commands\runserver.py", line 137, in inner_run
    handler = self.get_handler(*args, **options)
  File "G:\anaconda\lib\site-packages\django\contrib\staticfiles\management\commands\runserver.py", line 27, in get_handler
    handler = super().get_handler(*args, **options)
  File "G:\anaconda\lib\site-packages\django\core\management\commands\runserver.py", line 64, in get_handler
    return get_internal_wsgi_application()
  File "G:\anaconda\lib\site-packages\django\core\servers\basehttp.py", line 50, in get_internal_wsgi_application
    ) from err
django.core.exceptions.ImproperlyConfigured: WSGI application 'project3.wsgi.application' could not be loaded; Error importing module.

自定義中間件代碼如下：

from django.utils.deprecation import MiddlewareMixin

class MyMiddleware(MiddlewareMixin):

    def process_request(self,request):
        print("get 參數爲：",request.GET.get("a") )

settings.py中MIDDLEWAE代碼如下：

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'middleware.myApp.myMiddleware.MyMiddleware',
]

原因分析：

沒有找到'middleware'模塊。自定義的中間件沒有找到，疑惑

解決方案：

settings.py中配置自定義中間件時寫上完整路徑，從appname開始寫

項目名.app名.模塊名.中間件類名

修改後代碼如下：

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'myApp.middleware.myApp.myMiddleware.MyMiddleware',
]

重啓服務器，執行。沒問題了。

 

感謝參考：

https://blog.csdn.net/weixin_42290927/article/details/82663299