Spring云网关自定义网关过滤器不起作用

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class CustomFilter extends AbstractGatewayFilterFactory<CustomFilter.Config> {

    public CustomFilter() {
        super(Config.class);
    }

    @Override
    public GatewayFilter apply(Config config) {
        return (exchange, chain) -> {
            // 自定义过滤逻辑
            System.out.println("Custom filter is applied!");
            return chain.filter(exchange);
        };
    }

    public static class Config {
        // 配置属性
    }
}

spring:
  cloud:
    gateway:
      routes:
        - id: example_route
          uri: http://example.com
          filters:
            - CustomFilter

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>