springcloud gateway中打印请求参数，请求路径和返回数据

在Spring Cloud Gateway中，你可以通过定义一个全局过滤器来打印请求参数、请求路径和返回数据。以下是一个简单的全局过滤器示例，它会记录请求的路径、查询参数和payload。

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
 
import java.nio.charset.StandardCharsets;
 
public class LoggingFilter implements GlobalFilter {
 
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
 
        // 打印请求路径和查询参数
        System.out.println("Path: " + request.getPath());
        System.out.println("QueryParams: " + request.getQueryParams());
 
        // 打印请求体（payload）
        // 注意：这里会消耗请求体，所以在之后的过滤器中不能再读取请求体
        return DataBufferUtils.join(exchange.getRequest().getBody())
                .flatMap(dataBuffer -> {
                    byte[] bytes = new byte[dataBuffer.readableByteCount()];
                    dataBuffer.read(bytes);
                    // 打印请求体
                    System.out.println("Request body: " + new String(bytes, StandardCharsets.UTF_8));
                    DataBufferUtils.release(dataBuffer);
                    return Mono.empty();
                })
                .then(chain.filter(exchange));
    }
}

然后，你需要将这个全局过滤器注册到Spring Cloud Gateway中：

import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.builder.Routes;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class GatewayConfig {
 
    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
        return builder.routes()