最后想出了答案和帖子，以防对有同样问题的人有用。在会话通过Spring Security OAuth2身份验证后，有一个Authentication Object设置。它需要转换为OAuth2Authentication的示例。该对象具有令牌。

Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    if (auth instanceof OAuth2Authentication) {
        Object details = auth.getDetails();
        OAuth2AccessToken token = oauth2Ctx.getAccessToken();

        if (token != null && !token.isExpired()) {
            // Do Stuff
        }

替代方法的完整示例（使用Sping Boot 并禁用其自动配置的一部分）。
application.properties:

security.oauth2.client.client-id=client-id
security.oauth2.client.client-secret=client-secret
security.oauth2.client.access-token-uri=http://my-oidc-provider/auth/oauth2/token
security.oauth2.client.user-authorization-uri=http://my-oidc-provider/auth/oauth2/authorize
security.oauth2.resource.token-info-uri=http://my-oidc-provider/auth/oauth2/check_token
security.oauth2.client.scope=openid,email,profile
security.oauth2.resource.jwk.key-set-uri=http://my-oidc-provider/auth/oidc/jwks

/**
 * Extending the AuthorizationServerEndpointsConfiguration disables the Spring
 * Boot ResourceServerTokenServicesConfiguration.
 */
@Configuration
@EnableOAuth2Sso
public class OAuth2Config extends AuthorizationServerEndpointsConfiguration {

    @Value("${security.oauth2.resource.jwk.key-set-uri}")
    private String keySetUri;

    @Value("${security.oauth2.resource.token-info-uri}")
    private String checkTokenEndpointUrl;

    @Value("${security.oauth2.client.client-id}")
    private String clientId;

    @Value("${security.oauth2.client.client-secret}")
    private String clientSecret;

    @Bean
    public RemoteTokenServices resourceServerTokenServices() {
        RemoteTokenServices tokenService = new RemoteTokenServices();

        DefaultAccessTokenConverter accessTokenConverter = new DefaultAccessTokenConverter();
        accessTokenConverter.setUserTokenConverter(new CustomIdTokenConverter(keySetUri));
        tokenService.setAccessTokenConverter(accessTokenConverter);

        tokenService.setCheckTokenEndpointUrl(checkTokenEndpointUrl);
        tokenService.setClientId(clientId);
        tokenService.setClientSecret(clientSecret);

        return tokenService;
    }

    @Bean
    public ClientDetailsService clientDetailsService() {
        return new InMemoryClientDetailsService();
    }

    @Bean
    public UserInfoRestTemplateFactory userInfoRestTemplateFactory(
            ObjectProvider<List<UserInfoRestTemplateCustomizer>> customizers,
            ObjectProvider<OAuth2ProtectedResourceDetails> details,
            ObjectProvider<OAuth2ClientContext> oauth2ClientContext) {
        return new DefaultUserInfoRestTemplateFactory(customizers, details,
                oauth2ClientContext);
    }
}

public class CustomIdTokenConverter extends DefaultUserAuthenticationConverter {

    private final JwkTokenStore jwkTokenStore;

    public CustomIdTokenConverter(String keySetUri) {
        this.jwkTokenStore = new JwkTokenStore(keySetUri);
    }

    @Override
    public Authentication extractAuthentication(Map<String, ?> map) {

        String idToken = (String) map.get("id_token");

        OAuth2AccessToken token = jwkTokenStore.readAccessToken(idToken);

        Map<String, Object> claims = token.getAdditionalInformation();
        OAuth2RefreshToken refreshToken = token.getRefreshToken();

        String principal = (String) claims.get("sub");

        List<GrantedAuthority> authorities = AuthorityUtils.createAuthorityList("ROLE_USER");

        return new CustomAuthenticationData(principal, claims, authorities);
    }
}

public class CustomAuthenticationData extends UsernamePasswordAuthenticationToken {

    private final Map<String, Object> attributes;

    public CustomAuthenticationData(String username, Map<String, Object> attributes, Collection<? extends GrantedAuthority> authorities) {
        super(username, "N/A", authorities);
        this.attributes = attributes;
    }

    public Map<String, Object> getAttributes() {
        return attributes;
    }
}

我知道这是一个旧的线程，但我希望这有助于任何人寻找的回应。
使用您的“Authentication authentication”对象：

OAuth2AuthenticationToken oauth2Auth = (OAuth2AuthenticationToken) authentication;
String idToken = ((DefaultOidcUser) oauth2Auth.getPrincipal()).getIdToken().getTokenValue();

问候。