SpringCloud nacos 集成 gateway ，实现动态路由

在Spring Cloud Alibaba Nacos中，要实现Spring Cloud Gateway的动态路由，可以通过自定义RouteDefinitionRepository来实现。以下是一个简单的示例：

1. 添加依赖（确保Spring Cloud Gateway和Spring Cloud Alibaba Nacos Discovery的依赖已经添加）：

<!-- Spring Cloud Gateway Starter -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<!-- Spring Cloud Alibaba Nacos Discovery Starter -->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

2. 配置自定义的RouteDefinitionRepository：

@Component
public class NacosRouteDefinitionRepository implements RouteDefinitionRepository {
 
    @Autowired
    private ConfigService configService;
 
    @Autowired
    private NacosDiscoveryProperties nacosDiscoveryProperties;
 
    private static final String GROUP_ID = "DEFAULT_GROUP";
 
    private static final String DATA_ID = "gateway-dynamic-route";
 
    @PostConstruct
    public void init() {
        // 注册监听器，监听动态路由配置的变化
        configService.addListener(DATA_ID, GROUP_ID, new Listener() {
            @Override
            public void receiveConfigInfo(String configInfo) {
                // 当配置发生变化时，更新路由
                publish(configInfo);
            }
 
            @Override
            public Executor getExecutor() {
                return null;
            }
        });
    }
 
    @Override
    public Mono<Void> save(Mono<RouteDefinition> route) {
        // 不支持保存操作
        return Mono.error(new UnsupportedOperationException("Not implemented"));
    }
 
    @Override
    public Mono<Void> delete(Mono<String> routeId) {
        // 不支持删除操作
        return Mono.error(new UnsupportedOperationException("Not implemented"));
    }
 
    @Override
    public Flux<RouteDefinition> getRouteDefinitions() {
        // 获取配置中心的路由配置
        String content = configService.getConfig(DATA_ID, GROUP_ID, 3000);
        return Flux.fromIterable(getRoutes(content));
    }
 
    private void publish(String configInfo) {
        // 将配置信息转换为RouteDefinition列表，并发布
        List<RouteDefinition> routes = getRoutes(configInfo);
        Flux<RouteDefinition> definitionFlux = Flux.fromIterable(routes);
        routeDefinitionWriter.save(definitionFl