在Spring Cloud Gateway中，可以通過動態(tài)路由的注解@RoutingCondition來實現(xiàn)添加和刪除路由。以下是一個簡單的示例：

1. 創(chuàng)建一個接口，該接口將作為動態(tài)路由的觸發(fā)器：

import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.cloud.gateway.filter.factory.GatewayFilterFactory;
import org.springframework.cloud.gateway.filter.factory.RequestContext;
import org.springframework.cloud.gateway.filter.factory.ResponseWrapper;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DynamicRoutingConfig {

    @Bean
    public GatewayFilterFactory dynamicRoutingFilter(RequestContext context) {
        return new AbstractGatewayFilterFactory() {
            @Override
            public boolean shouldFilter(RequestContext requestContext, ResponseWrapper responseWrapper) {
                // 根據(jù)條件判斷是否過濾請求
                return true;
            }

            @Override
            public void filter(RequestContext requestContext, ResponseWrapper responseWrapper, RouteLocator routeLocator) {
                // 處理請求并返回響應(yīng)
                routeLocator.route("your-route-name", context -> {
                    // 在這里添加你的路由邏輯
                });
            }
        };
    }
}

1. 然后，創(chuàng)建一個過濾器工廠，用于創(chuàng)建動態(tài)路由的實現(xiàn)：

import org.springframework.cloud.gateway.filter.factory.GatewayFilterFactory;
import org.springframework.cloud.gateway.filter.factory.RequestContext;
import org.springframework.cloud.gateway.filter.factory.ResponseWrapper;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DynamicRoutingFilterFactoryConfig {

    @Bean
    public GatewayFilterFactory dynamicRoutingFilterFactory(RequestContext context) {
        return new AbstractGatewayFilterFactory() {
            @Override
            public boolean shouldFilter(RequestContext requestContext, ResponseWrapper responseWrapper) {
                // 根據(jù)條件判斷是否過濾請求
                return true;
            }

            @Override
            public void filter(RequestContext requestContext, ResponseWrapper responseWrapper, RouteLocator routeLocator) {
                // 在這里添加你的動態(tài)路由邏輯
            }
        };
    }
}

1. 最后，在Spring Cloud Gateway的配置文件中，添加動態(tài)路由的配置：

spring:
  gateway:
    routes:
      - id: your-route-name
        uri: http://your-service-a
        predicates:
          - Path=/your-path-a/**
        filters:
          - name: dynamicRoutingFilterFactory
            type: com.example.DynamicRoutingFilterFactoryConfig$DynamicRoutingFilterFactory

這樣，當(dāng)請求匹配到/your-path-a/**時，就會調(diào)用dynamicRoutingFilterFactory中的filter方法，執(zhí)行動態(tài)路由的邏輯。