给我讲讲这段代码/**
* Processes an authentication form submission. Called
* {@code AuthenticationProcessingFilter} prior to
Spring Security 3.0.
* <p>
* Login forms must present two parameters to this filter: a username and password. The
* default parameter names to use are contained in the static fields
* {@link #
SPRING_SECURITY_FORM_USERNAME_KEY} and
* {@link #
SPRING_SECURITY_FORM_PASSWORD_KEY}. The parameter names can also be changed by
* setting the {@code usernameParameter} and {@code passwordParameter} properties.
* <p>
* This filter by default responds to the URL {@code /login}.
*
*
@author Ben Alex
*
@author Colin Sampaleanu
*
@author Luke Taylor
* @since 3.0
*/
public class PasswordAuthenticationFilter extends
UsernamePasswordAuthenticationFilter {
public PasswordAuthenticationFilter
(ApplicationContext applicationContext
) {
setRequiresAuthenticationRequestMatcher
(new PathAndTypeRequestMatcher
("/login", "POST",
"password"
));
PasswordIdentityAuthenticationHandlerImpl handler;
try {
handler = applicationContext.getBean
(PasswordIdentityAuthenticationHandlerImpl.class
);
} catch
(BeansException e
) {
handler = null;
}
final PasswordAuthenticationProvider authenticationProvider =
new PasswordAuthenticationProvider
(handler
);
authenticationProvider.setUserDetailsService
(applicationContext.getBean
(UserDetailsService.class
));
List<AuthenticationProvider> providers = Stream.of
(authenticationProvider
).collect
(Collectors.toList
());
ProviderManager providerManager = new ProviderManager
(providers
);
providerManager.setAuthenticationEventPublisher
(applicationContext.getBean
(AuthenticationEventPublisher.class
));
setAuthenticationManager
(providerManager
);
}
}
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