Login

Authentiacting users

authenticate(request=None, **credentials)

　　Use authenticate() to verify a set of credentials. It takes credentials as keyword arguments, username and password for the default case, checks them against each authentication backend, and 　　returns a User object if the credentials are valid for a backend. If the credentials aren’t valid for any backend or if a backend raises PermissionDenied, it returns None. For example:

　　　　from django.contrib.auth. import authenticate

　　     username=request.POST.get('username')

　　     password=request.POST.get('password')

　　　  user = authenticate(username, password)

　　　  if user:

　　　　　　login(request, user)

　　　　　　do something

　　　  else:

　　　　　　do something

Login

django.contrib.auth.login

login(request, user, backend=None)

　　Note that any data during the anonymous session is retained(匿名会话在会话中保留) in the session after a user logs in.　

　　一般

　　user = authenticate(username, password)   login(request, user)　　　

 

Logout

django.contrib.auth.logout

logout(request)

　　To log out a user who has been logged in via django.contrib.auth.login(), use django.contrib.auth.logout() within your view. It takes an HttpRequest object and has no return value.