import org.jasig.cas.authentication.principal.PersonDirectoryPrincipalResolver; //导入依赖的package包/类
/**
 * Registers the default credentials-to-principal resolver for the second or later factors. Also attaches an
 * attribute repository to the resolver.
 */
protected void registerDefaultCredentialsToPrincipalResolver() {
    final List<PrincipalResolver> resolvers = this.context.getBean("mfaCredentialsToPrincipalResolvers", List.class);
    final PersonDirectoryPrincipalResolver defaultResolver = new PersonDirectoryPrincipalResolver();

    final IPersonAttributeDao attributeRepository = this.context.getBean("attributeRepository", IPersonAttributeDao.class);
    final PrincipalFactory principalFactory = this.context.getBean("principalFactory", PrincipalFactory.class);
    defaultResolver.setAttributeRepository(attributeRepository);
    defaultResolver.setPrincipalFactory(principalFactory);
    resolvers.add(defaultResolver);
}