Spring Cloud Gateway Nacos 实现动态路由

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
import org.springframework.cloud.gateway.route.RouteDefinition;
import org.springframework.cloud.gateway.route.RouteDefinitionWriter;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.stereotype.Component;
import com.alibaba.fastjson.JSON;
import com.alibaba.nacos.api.config.annotation.NacosValue;
import com.alibaba.nacos.api.config.annotation.NacosConfigListener;
import java.util.List;
import java.util.stream.Collectors;
 
@Component
public class NacosRouteDefinitionRepository {
 
    @NacosValue(value = "${spring.cloud.gateway.nacos.routes:[]}", groupId = "${spring.cloud.nacos.groupId:DEFAULT_GROUP}", type = JSON.class)
    private List<RouteDefinition> routes;
 
    private final RouteDefinitionWriter routeDefinitionWriter;
    private final ApplicationEventPublisher publisher;
 
    public NacosRouteDefinitionRepository(RouteDefinitionWriter routeDefinitionWriter, ApplicationEventPublisher publisher) {
        this.routeDefinitionWriter = routeDefinitionWriter;
        this.publisher = publisher;
    }
 
    @PostConstruct
    public void init() {
        // 初始化时注册Nacos配置监听器
        registerNacosListener();
    }
 
    private void registerNacosListener() {
        // 注册Nacos配置监听器，动态更新路由规则
        NacosConfigListener nacosConfigListener = new NacosConfigListener() {
            @Override
            public void receiveConfigInfo(String configInfo) {
                // 接收到配置变化后，更新路由定义
                List<RouteDefinition> routeDefinitions = JSON.parseArray(configInfo, RouteDefinition.class);
                this.refreshRoute(routeDefinitions);
            }
 
            @Override
            public Executor getExecutor() {
                return null; // 使用默认线程池
            }
        };
 
        // 注册监听器
        // NacosConfigService nacosConfigService = ...;
        // nacosConfigService.addListener(...);
    }
 
    private void refreshRoute(List<RouteDefinition> routeDefinitions) {
        this.routes = routeDefinitions;
        this.routeDefinitionWriter.deleteAll();
        for (RouteDefinition routeDefinition : this.routes) {
            this.routeDefinitionWriter.save(Mono.just(routeDefinition)).subscribe();
        }
        this.publisher.publishEvent(new RefreshRoutesEvent(this))