自定义Spring Cloud Gateway过滤器工厂：实现PrintAnyGatewayFilterFactory

以下是一个简化的PrintAnyGatewayFilterFactory示例，它创建了一个打印日志的GatewayFilter Factory。

package com.example.filter;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
 
@Component
public class PrintAnyGatewayFilterFactory extends AbstractGatewayFilterFactory<PrintAnyGatewayFilterFactory.Config> {
    private static final Logger log = LoggerFactory.getLogger(PrintAnyGatewayFilterFactory.class);
 
    public PrintAnyGatewayFilterFactory() {
        super(Config.class);
    }
 
    @Override
    public GatewayFilter apply(Config config) {
        return (exchange, chain) -> {
            ServerHttpRequest request = exchange.getRequest();
            log.info("Request: " + request.getMethodValue() + " " + request.getURI());
            return chain.filter(exchange).then(
                Mono.fromRunnable(() -> {
                    log.info("Response: " + exchange.getResponse().getStatusCode());
                })
            );
        };
    }
 
    public static class Config {
        // 这里可以添加配置属性
    }
}

这段代码定义了一个名为PrintAnyGatewayFilterFactory的GatewayFilter工厂，它记录请求方法和URI，然后在响应被写入之前记录状态码。这个例子展示了如何在Spring Cloud Gateway中创建自定义的GatewayFilter工厂。