import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
public void addConnection(Connection<?> connection) {
    //check cardinality
    SocialAuthenticationService<?> socialAuthenticationService = 
            this.socialAuthenticationServiceLocator.getAuthenticationService(connection.getKey().getProviderId());
    if (socialAuthenticationService.getConnectionCardinality() == ConnectionCardinality.ONE_TO_ONE ||
            socialAuthenticationService.getConnectionCardinality() == ConnectionCardinality.ONE_TO_MANY){
        List<UserSocialConnection> storedConnections = 
                this.userSocialConnectionRepository.findByProviderIdAndProviderUserId(
                        connection.getKey().getProviderId(), connection.getKey().getProviderUserId());
        if (storedConnections.size() > 0){
            //not allow one providerId/providerUserId connect to multiple userId
            throw new DuplicateConnectionException(connection.getKey());
        }
    }
    
    UserSocialConnection userSocialConnection = this.userSocialConnectionRepository
            .findByUserIdAndProviderIdAndProviderUserId(userId, connection.getKey().getProviderId(), 
                    connection.getKey().getProviderUserId());
    if (userSocialConnection == null) {
        ConnectionData data = connection.createData();
        userSocialConnection = new UserSocialConnection(userId, data.getProviderId(), data.getProviderUserId(), 0,
                data.getDisplayName(), data.getProfileUrl(), data.getImageUrl(), encrypt(data.getAccessToken()),
                encrypt(data.getSecret()), encrypt(data.getRefreshToken()), data.getExpireTime());
        this.userSocialConnectionRepository.save(userSocialConnection);
    } else {
        throw new DuplicateConnectionException(connection.getKey());
    }
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
    return DiscordAuthenticationService.class;
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
	return NaverConnectionFactory.NaverAuthenticationService.class;
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
	return StravaAuthenticationService.class;
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
    return TencentWeiboAuthenticationService.class;
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
	return Auth0AuthenticationService.class;
}
 

import org.springframework.social.security.provider.SocialAuthenticationService; //导入依赖的package包/类
/**
 * @see org.springframework.social.config.support.ProviderConfigurationSupport#getAuthenticationServiceClass()
 */
@Override
protected Class<? extends SocialAuthenticationService<?>> getAuthenticationServiceClass() {
    return AmazonAuthenticationService.class;
}