auth2 如果配置gateway进行访问 代码

以下是使用 Spring Cloud Gateway 和 Spring Security OAuth2 进行 OAuth2 认证和授权的示例代码：

1. 配置 application.yml

spring:
  security:
    oauth2:
      client:
        registration:
          my-client:
            client-id: my-client-id
            client-secret: my-client-secret
            scope: read,write
            authorization-grant-type: authorization_code
            redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
            client-name: My Client
        provider:
          my-oauth2:
            authorization-uri: https://oauth2.example.com/oauth2/authorize
            token-uri: https://oauth2.example.com/oauth2/token
            user-info-uri: https://oauth2.example.com/oauth2/userinfo
            user-name-attribute: sub

2. 配置 GatewaySecurityConfig.java

@Configuration
@EnableWebFluxSecurity
public class GatewaySecurityConfig {

    @Autowired
    private ReactiveClientRegistrationRepository clientRegistrationRepository;

    @Bean
    public SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http) {
        http
            .authorizeExchange()
                .pathMatchers("/login/**", "/webjars/**").permitAll()
                .anyExchange().authenticated()
            .and()
                .oauth2Login()
                    .authenticationSuccessHandler(new RedirectServerAuthenticationSuccessHandler("/"))
            .and()
                .csrf().disable();

        return http.build();
    }

    @Bean
    public SecurityWebFilterChain springSecurityOAuth2FilterChain(ServerHttpSecurity http) {
        // Use the configured OAuth2 client registration repository
        ServerOAuth2AuthorizedClientExchangeFilterFunction oauth =
                new ServerOAuth2AuthorizedClientExchangeFilterFunction(clientRegistrationRepository,
                        new UnAuthenticatedServerOAuth2AuthorizedClientRepository());
        oauth.setDefaultOAuth2AuthorizedClient(true);

        http
            .authorizeExchange()
                .pathMatchers("/login/**", "/webjars/**").permitAll()
                .anyExchange().authenticated()
            .and()
                .oauth2Login()
                    .authenticationSuccessHandler(new RedirectServerAuthenticationSuccessHandler("/"))
            .and()
                .oauth2Client();

        return http.build();
    }

}

3. 配置 RouteConfig.java

@Configuration
public class RouteConfig {

    @Autowired
    private ServerOAuth2AuthorizedClientExchangeFilterFunction oauth2Client;

    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
        return builder.routes()
            .route("path_route", r -> r.path("/api/**")
                .filters(f -> f.filter(oauth2Client).stripPrefix(1))
                .uri("http://localhost:8081"))
            .build();
    }

}

这是一个简单的示例，您需要根据您的具体情况进行调整和扩展。