如何在使用Spring Oauth2RestTemplate时切换到服务用户

@Configuration
public class Oauth2RestTemplateConfig {

    @Value("${oauth2.clientId}")
    private String clientId;

    @Value("${oauth2.clientSecret}")
    private String clientSecret;

    @Value("${oauth2.accessTokenUri}")
    private String accessTokenUri;

    @Bean
    public OAuth2RestTemplate oauth2RestTemplate() {
        ClientCredentialsResourceDetails resourceDetails = new ClientCredentialsResourceDetails();
        resourceDetails.setClientId(clientId);
        resourceDetails.setClientSecret(clientSecret);
        resourceDetails.setAccessTokenUri(accessTokenUri);

        return new OAuth2RestTemplate(resourceDetails);
    }
}

@Autowired
private OAuth2RestTemplate oauth2RestTemplate;

public void callApi() {
    ResponseEntity<String> response = oauth2RestTemplate.getForEntity("https://api.example.com/resource", String.class);
    // 处理API响应
}