如何在Spring中获取Keycloak令牌

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-spring-boot-starter</artifactId>
</dependency>

keycloak.auth-server-url=http://localhost:8080/auth
keycloak.realm=myrealm
keycloak.resource=myclient
keycloak.credentials.secret=myclientsecret

@Configuration
@EnableWebSecurity
@ComponentScan(basePackageClasses = KeycloakSecurityComponents.class)
public class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter {

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        KeycloakAuthenticationProvider keycloakAuthenticationProvider = keycloakAuthenticationProvider();
        keycloakAuthenticationProvider.setGrantedAuthoritiesMapper(new SimpleAuthorityMapper());
        auth.authenticationProvider(keycloakAuthenticationProvider);
    }

    @Bean
    public KeycloakSpringBootConfigResolver keycloakConfigResolver() {
        return new KeycloakSpringBootConfigResolver();
    }

    @Bean
    @Override
    protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
        return new RegisterSessionAuthenticationStrategy(new SessionRegistryImpl());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        super.configure(http);
        http.authorizeRequests()
            .antMatchers("/api/**").hasRole("user")
            .anyRequest().permitAll();
    }
}

Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (authentication instanceof KeycloakAuthenticationToken) {
    KeycloakAuthenticationToken keycloakAuthenticationToken = (KeycloakAuthenticationToken) authentication;
    KeycloakPrincipal<KeycloakSecurityContext> principal = (KeycloakPrincipal<KeycloakSecurityContext>) keycloakAuthenticationToken.getPrincipal();
    KeycloakSecurityContext keycloakSecurityContext = principal.getKeycloakSecurityContext();
    AccessToken accessToken = keycloakSecurityContext.getToken();
    // 获取令牌信息，如令牌的ID、过期时间、用户信息等
    String tokenId = accessToken.getId();
    Date expirationDate = accessToken.getExpiration();
    String userId = accessToken.getSubject();
    // 其他操作...
}