在SpringCloud 使用Security+Oauth2 时候再去使用fegin,发现出现401未授权

在使用Spring Cloud Security和OAuth2时，可能会出现401未授权的问题。这通常是由于Feign客户端没有传递OAuth2令牌所致。

为了解决这个问题，需要在Feign客户端上配置一个拦截器，以便在每个请求中传递OAuth2令牌。具体步骤如下：

1. 创建一个OAuth2拦截器

@Component
public class OAuth2FeignRequestInterceptor implements RequestInterceptor {

    private final OAuth2AuthorizedClientService clientService;

    public OAuth2FeignRequestInterceptor(OAuth2AuthorizedClientService clientService) {
        this.clientService = clientService;
    }

    @Override
    public void apply(RequestTemplate template) {
        OAuth2AuthenticationToken authentication = (OAuth2AuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
        if (authentication != null && authentication.isAuthenticated()) {
            OAuth2AuthorizedClient client = clientService.loadAuthorizedClient(
                    authentication.getAuthorizedClientRegistrationId(), authentication.getName());
            template.header("Authorization", "Bearer " + client.getAccessToken().getTokenValue());
        }
    }
}

2. 在Feign客户端上启用OAuth2拦截器

@FeignClient(name = "example-service", configuration = OAuth2FeignClientConfiguration.class)
public interface ExampleClient {

    @GetMapping("/example")
    String getExample();
}

@Configuration
@EnableFeignClients(clients = ExampleClient.class)
public class FeignConfiguration {

    @Autowired
    private OAuth2AuthorizedClientService clientService;

    @Bean
    public OAuth2FeignRequestInterceptor oAuth2FeignRequestInterceptor() {
        return new OAuth2FeignRequestInterceptor(clientService);
    }
}

@Configuration
public class OAuth2FeignClientConfiguration {

    @Autowired
    private OAuth2FeignRequestInterceptor oAuth2FeignRequestInterceptor;

    @Bean
    public RequestInterceptor requestInterceptor() {
        return oAuth2FeignRequestInterceptor;
    }
}

在上面的配置中，我们创建了一个名为OAuth2FeignRequestInterceptor的拦截器，它将在每个请求中传递OAuth2令牌。然后，在Feign客户端上启用此拦截器，以确保令牌被正确传递。

希望这个解决方案能够帮助解决你的问题。