Spring安全从OAuth2AuthenticationToken获取tokenValue

import org.springframework.security.oauth2.server.resource.authentication.OAuth2AuthenticationToken;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TokenController {

    @GetMapping("/token")
    public String getTokenValue(OAuth2AuthenticationToken authentication) {
        if (authentication != null) {
            return authentication.getToken().getTokenValue();
        }
        return "No token found";
    }
}

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests(authorizeRequests ->
                authorizeRequests
                    .antMatchers("/token").authenticated()
            )
            .oauth2ResourceServer(oauth2ResourceServer ->
                oauth2ResourceServer
                    .jwt(jwt ->
                        jwt.jwtAuthenticationConverter(jwtAuthenticationConverter())
                    )
            );
    }

    private JwtAuthenticationConverter jwtAuthenticationConverter() {
        JwtAuthenticationConverter converter = new JwtAuthenticationConverter();
        converter.setJwtGrantedAuthoritiesConverter(new JwtGrantedAuthoritiesConverter());
        return converter;
    }
}