AuthenticationManager
时间: 2023-09-15 18:17:08 浏览: 53
AuthenticationManager is an interface in Spring Security that provides a way to authenticate a user by delegating the authentication process to one or more AuthenticationProviders. It is responsible for managing the authentication process and determining whether a user is authenticated or not.
The AuthenticationManager interface defines a single method, "authenticate," which takes an Authentication object as an argument and returns an Authentication object. The Authentication object represents the user's credentials and includes the username and password.
When a user tries to access a secured resource, Spring Security intercepts the request and checks whether the user is authenticated or not. If the user is not authenticated, Spring Security calls the authenticate method of the AuthenticationManager. The AuthenticationManager then delegates the authentication process to one or more AuthenticationProviders.
Each AuthenticationProvider is responsible for authenticating the user based on a specific authentication mechanism, such as LDAP, database, or OAuth. The AuthenticationProvider returns an Authentication object that contains information about the authenticated user, such as the user's roles and authorities.
The AuthenticationManager then combines the results of all the AuthenticationProviders and returns a final Authentication object that represents the authenticated user. If none of the AuthenticationProviders can authenticate the user, the AuthenticationManager throws an AuthenticationException.
Overall, the AuthenticationManager is a key component of Spring Security that provides a flexible and extensible way to authenticate users using multiple authentication mechanisms.