SpringCloud Gateway 打印请求和响应信息，直接Copy直接用

最新推荐文章于 2024-03-02 14:32:34 发布

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最新推荐文章于 2024-03-02 14:32:34 发布

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分类专栏： filter spring cloud 文章标签： spring cloud gateway java

原文链接：https://blog.youkuaiyun.com/qq_34972627/article/details/113699040?

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该博客主要介绍了如何使用Spring Cloud Gateway的全局过滤器实现对HTTP请求和响应的拦截。在请求过滤器中，捕获了POST和GET请求的参数，并记录了请求头和请求体信息。在响应过滤器中，对响应内容进行了读取，转换并记录，同时对响应数据进行了修改。这两部分过滤器都具有特定的优先级设置，确保了拦截操作的顺序和效率。

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请求：

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.io.UnsupportedEncodingException;
import java.net.URI;

/**
 * 在filter中获取前置预言里面的请求body
 */
@Component
@Slf4j
public class WrapperRequestGlobalFilter implements GlobalFilter, Ordered {
    /**
     * 优先级最高
     */
    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        URI URIPath = request.getURI();
        String path = request.getPath().value();
        String method = request.getMethodValue();
        HttpHeaders header = request.getHeaders();
        log.info("");
        log.info("***********************************请求信息**********************************");
        log.info("请求request信息：URI = {}, path = {}，method = {}，header = {}。", URIPath, path, method, header);
        if ("POST".equals(method)) {
            return DataBufferUtils.join(exchange.getRequest().getBody())
                    .flatMap(dataBuffer -> {
                        byte[] bytes = new byte[dataBuffer.readableByteCount()];
                        dataBuffer.read(bytes);
                        try {
                            String bodyString = new String(bytes, "utf-8");
                            log.info("请求参数：" + bodyString);
                            exchange.getAttributes().put("POST_BODY", bodyString);
                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }
                        DataBufferUtils.release(dataBuffer);
                        Flux<DataBuffer> cachedFlux = Flux.defer(() -> {
                            DataBuffer buffer = exchange.getResponse().bufferFactory()
                                    .wrap(bytes);
                            return Mono.just(buffer);
                        });

                        ServerHttpRequest mutatedRequest = new ServerHttpRequestDecorator(
                                exchange.getRequest()) {
                            @Override
                            public Flux<DataBuffer> getBody() {
                                return cachedFlux;
                            }
                        };
                        log.info("****************************************************************************\n");
                        return chain.filter(exchange.mutate().request(mutatedRequest)
                                .build());
                    });
        } else if ("GET".equals(method)) {
            MultiValueMap<String, String> queryParams = request.getQueryParams();
            log.info("请求参数：" + queryParams);
            log.info("****************************************************************************\n");
            return chain.filter(exchange);
        }
        log.info("****************************************************************************\n");
        return chain.filter(exchange);
    }
}

响应：

import lombok.extern.slf4j.Slf4j;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseCookie;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import java.util.Set;

@Component
@Slf4j
public class WrapperResponseGlobalFilter implements GlobalFilter, Ordered {

    @Override
    public int getOrder() {
        //-1 is response write filter, must be called before that
        return -2;
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取response的 返回数据
        ServerHttpResponse originalResponse = exchange.getResponse();
        DataBufferFactory bufferFactory = originalResponse.bufferFactory();
        ServerHttpResponseDecorator decoratedResponse = new ServerHttpResponseDecorator(originalResponse) {
            @Override
            public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
                if (getStatusCode().equals(HttpStatus.OK) && body instanceof Flux) {
                    Flux<? extends DataBuffer> fluxBody = Flux.from(body);
                    return super.writeWith(fluxBody.map(dataBuffer -> {
                        byte[] content = new byte[dataBuffer.readableByteCount()];
                        dataBuffer.read(content);
                        //释放掉内存
                        DataBufferUtils.release(dataBuffer);
                        //responseData就是下游系统返回的内容,可以查看修改
                        String responseData = new String(content, Charset.forName("UTF-8"));
                        log.info("");
                        log.info("***********************************响应信息**********************************");
                        log.info("响应内容:{}", responseData);
                        log.info("****************************************************************************\n");
                        byte[] uppedContent = new String(content, Charset.forName("UTF-8")).getBytes();
                        return bufferFactory.wrap(uppedContent);
                    }));
                } else {
                    log.error("响应code异常:{}", getStatusCode());
                }
                return super.writeWith(body);
            }
        };
        return chain.filter(exchange.mutate().response(decoratedResponse).build());
    }
}