如何在java中获取令牌

<dependency>
    <groupId>org.springframework.security.oauth</groupId>
    <artifactId>spring-security-oauth2</artifactId>
    <version>2.4.1.RELEASE</version>
</dependency>

@Configuration
@EnableOAuth2Client
public class OAuth2ClientConfig {

    @Bean
    public OAuth2ProtectedResourceDetails oauth2RemoteResource() {
        ClientCredentialsResourceDetails details = new ClientCredentialsResourceDetails();
        details.setAccessTokenUri("https://oauth.example.com/token");
        details.setClientId("your-client-id");
        details.setClientSecret("your-client-secret");
        details.setGrantType("client_credentials");
        return details;
    }

    @Bean
    public OAuth2RestTemplate oauth2RestTemplate(OAuth2ClientContext oauth2ClientContext,
                                                 OAuth2ProtectedResourceDetails oauth2RemoteResource) {
        return new OAuth2RestTemplate(oauth2RemoteResource, oauth2ClientContext);
    }
}

@RestController
public class TokenController {

    @Autowired
    private OAuth2RestTemplate restTemplate;

    @GetMapping("/token")
    public String getToken() {
        OAuth2AccessToken accessToken = restTemplate.getAccessToken();
        return accessToken.getValue();
    }
}