目录

项目里使用了Feign进行远程调用，有时为了问题排查，需要开启请求和响应日志，下面简介一下如何开启Feign日志：
注：本文基于

  • spring-boot-starter-parent 2.3.4.RELEASE
  • spring-cloud-starter-openfeign 2.2.3.RELEASE
2024-07-23 补充内容：

今天在JDK21 + spring-cloud-starter-openfeign4.1.2 + spring-cloud-config-server中，发现配置中心的yml里写：
feign.client.config.default.logger-level: full 无效，改用代码里定义才生效，暂时不确定原因：

@Bean
Logger.Level feignLoggerLevel() {
    return Logger.Level.FULL;
}

2024-8-30补充内容：

调试跟踪了一下代码，feign.SynchronousMethodHandler类的executeAndDecode方法，会判断当前类的logLevel 并输出日志：

Object executeAndDecode(RequestTemplate template, Options options) throws Throwable {
    Request request = targetRequest(template);

    if (logLevel != Logger.Level.NONE) {
      logger.logRequest(metadata.configKey(), logLevel, request);
    }

这个logLevel 属性，是由FeignClientFactoryBean类的configureUsingProperties方法，去读取yml配置，然后把defaultConfig写进去，这个defaultConfig定义在ConfigurationProperties类里，openfeign2.2.6的定义如下，读取yml里 feign.client 配置：

@ConfigurationProperties("feign.client")
public class FeignClientProperties {
	private String defaultConfig = "default";
	public String getDefaultConfig() {
		return this.defaultConfig;
	}

而openfeign4.1.2的定义如下，读取yml里 spring.cloud.openfeign.client 配置：

@ConfigurationProperties("spring.cloud.openfeign.client")
public class FeignClientProperties {
	private String defaultConfig = "default";
	public String getDefaultConfig() {
		return defaultConfig;
	}

所以，如果使用spring-cloud-starter-openfeign4.1.2或更高版本时，yml配置如下：

# 下面的配置，也可以写代码代替
# @Bean
# public Logger.Level level() { return Logger.Level.FULL; }
spring:
  cloud:
    openfeign:
      client:
        config:
          default:
            connectTimeout: 5000
            readTimeout: 5000
            loggerLevel: full
# 参考: https://docs.spring.io/spring-cloud-openfeign/reference/spring-cloud-openfeign.html
以下是日志记录的正文

1、项目里定义FeignClient接口：

package com.example.demo.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(name = "deom", url = "https://www.baidu.com")
public interface FeignDemo {
    @GetMapping("/")
    String test();
}

2、单个FeignClient接口开启日志：

在 application.yml 里指定Feign接口日志级别为DEBUG，类型为FULL：
注：com.example.demo.feign.FeignDemo就是上面定义的FeignClient接口

logging:
  level:
    com.example.demo.feign.FeignDemo: debug
# 下面的配置，也可以写代码代替
# @Bean
# public Logger.Level level() { return Logger.Level.FULL; }
feign:
  client:
    config:
      default:
        logger-level: full

OK了，重启项目，调用 FeignDemo.test() 方法后，会输出如下日志：

2020-10-13 11:46:24.161 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] ---> GET https://www.baidu.com HTTP/1.1
2020-10-13 11:46:24.162 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] ---> END HTTP (0-byte body)
2020-10-13 11:46:24.255 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] <--- HTTP/1.1 200 OK (93ms)
2020-10-13 11:46:24.255 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] content-length: 2443
2020-10-13 11:46:24.255 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] content-type: text/html
2020-10-13 11:46:24.256 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] date: Tue, 13 Oct 2020 03:46:24 GMT
2020-10-13 11:46:24.256 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] server: bfe
2020-10-13 11:46:24.256 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] 
2020-10-13 11:46:24.257 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] <!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus=autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn" autofocus></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=https://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');
                </script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>使用百度前必读</a>&nbsp; <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a>&nbsp;京ICP证030173号&nbsp; <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>

2020-10-13 11:46:24.257 DEBUG 20824 --- [nio-8080-exec-4] com.example.demo.feign.FeignDemo         : [FeignDemo#test] <--- END HTTP (2443-byte body)

3、所有FeignClient接口 开启日志

上面的方法，只能开启单个FeignClient接口，如果项目里有10个接口，那么要在yml里配置10项，而且以后添加新的FeignClient，还要记得去修改yml配置，太麻烦。
所以，下面是开启所有FeignClient接口日志的配置：

3.1、修改FeignConfiguration，自定义feign.Logger，如下：

package com.example.demo.cacheDemo;

import feign.slf4j.Slf4jLogger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FeignConfiguration {
    @Bean
    public feign.Logger logger() {
        return new Slf4jLogger();
    }
}

3.2、还是修改 application.yml 配置：

logging:
  level:
    # 删除具体的FeignClient接口配置，只保留这一个就好了
    feign.Logger: debug
# 也可以写代码代替
# @Bean
# public Logger.Level level() { return Logger.Level.FULL; }
feign:
  client:
    config:
      default:
        loggerLevel: full

2.3、OK了，此时，项目里不管新增多少个 FeignClient，都会输出日志。

4、重写FeignClient输出日志(推荐)

根据上面输出的日志，可以看到是多条INFO日志，在并发时，很有可能会互相干扰，而且格式也无法调整。
我们知道，Feign默认情况下，是使用 feign.Client.Default 发起http请求；
我们可以重写Client，并注入Bean来替换掉 feign.Client.Default，从而实现日志记录，当然也可以做其它任意事情了，比如添加Header。下面是注入Bean的代码：

// 默认不注入，如果yml配置里有 logging.level.beinet.cn.demostudy.MyClient 才注入
@Bean
@ConditionalOnProperty("logging.level.beinet.cn.demostudy.MyClient")
MyClient getClient() throws NoSuchAlgorithmException, KeyManagementException {
    // 忽略SSL校验
    SSLContext ctx = SSLContext.getInstance("SSL");
    X509TrustManager tm = new X509TrustManager() {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
    };
    ctx.init(null, new TrustManager[]{tm}, null);
    return new MyClient(ctx.getSocketFactory(), (hostname, sslSession) -> true);
}

下面是重写的Client完整代码：

package beinet.cn.demostudy;

import feign.Client;
import feign.Request;
import feign.Response;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StreamUtils;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;
import java.util.Collection;
import java.util.Map;

@Slf4j
public class MyClient extends Client.Default {
    public MyClient(SSLSocketFactory socketFactory, HostnameVerifier hostnameVerifier) {
        super(socketFactory, hostnameVerifier);
    }

    @Override
    public Response execute(Request request, Request.Options options) throws IOException {
        StringBuilder sb = new StringBuilder("[log started]\r\n");
        sb.append(request.httpMethod()).append(" ").append(request.url()).append("\r\n");
        CombineHeaders(sb, request.headers()); // 请求Header
        CombineBody(sb, request.body());

        long costTime = -1;
        Exception exception = null;
        BufferingFeignClientResponse response = null;
        long begin = System.currentTimeMillis();
        try {
            response = new BufferingFeignClientResponse(super.execute(request, options));
            costTime = (System.currentTimeMillis() - begin);
        } catch (Exception exp) {
            costTime = (System.currentTimeMillis() - begin);
            exception = exp;
            throw exp;
        } finally {
            sb.append("\r\nResponse cost time(ms)： ").append(String.valueOf(costTime));
            if (response != null)
                sb.append("  status: ").append(response.status());
            sb.append("\r\n");
            if (response != null) {
                CombineHeaders(sb, response.headers()); // 响应Header
                sb.append("Body:\r\n").append(response.body()).append("\r\n");
            }
            if (exception != null) {
                sb.append("Exception:\r\n  ").append(exception.getMessage()).append("\r\n");
            }
            sb.append("\r\n[log ended]");
            log.debug(sb.toString());
        }

        Response ret = response.getResponse().toBuilder()
                .body(response.getBody(),
                        response.getResponse().body().length()).build();
        response.close();

        return ret;
    }

    private static void CombineHeaders(StringBuilder sb, Map<String, Collection<String>> headers) {
        if (headers != null && !headers.isEmpty()) {
            sb.append("Headers:\r\n");
            for (Map.Entry<String, Collection<String>> ob : headers.entrySet()) {
                for (String val : ob.getValue()) {
                    sb.append("  ").append(ob.getKey()).append(": ").append(val).append("\r\n");
                }
            }
        }
    }

    private static void CombineBody(StringBuilder sb, byte[] body) {
        if (body == null || body.length <= 0)
            return;
        sb.append("Body:\r\n").append(new String(body)).append("\r\n");
    }


    static final class BufferingFeignClientResponse implements Closeable {
        private Response response;
        private byte[] body;

        private BufferingFeignClientResponse(Response response) {
            this.response = response;
        }

        private Response getResponse() {
            return this.response;
        }

        private int status() {
            return this.response.status();
        }

        private Map<String, Collection<String>> headers() {
            return this.response.headers();
        }

        private String body() throws IOException {
            StringBuilder sb = new StringBuilder();
            try (InputStreamReader reader = new InputStreamReader(getBody())) {
                char[] tmp = new char[1024];
                int len;
                while ((len = reader.read(tmp, 0, tmp.length)) != -1) {
                    sb.append(new String(tmp, 0, len));
                }
            }
            return sb.toString();
        }

        private InputStream getBody() throws IOException {
            if (this.body == null) {
                this.body = StreamUtils.copyToByteArray(this.response.body().asInputStream());
            }
            return new ByteArrayInputStream(this.body);
        }

        @Override
        public void close() {
            this.response.close();
        }
    }
}

输出日志示例：

2020-10-15 16:48:26.081 DEBUG 15664 --- [           main] beinet.cn.demostudy.MyClient             : [log started]
POST https://www.baidu.com?flg=3
Headers:
  Content-Length: 14
  Content-Type: text/plain;charset=UTF-8
Body:
abcde我是ddd

Response cost time(ms)： 207  status: 200
Headers:
  content-length: 2443
  content-type: text/html
  date: Thu, 15 Oct 2020 08:48:27 GMT
  server: bfe
Body:
<!DOCTYPE html>百度的html</html>

[log ended]

5、重写feign.Logger输出日志(推荐)

上面是重写Client，需要关注http的执行过程，并且还要处理ssl逻辑，麻烦一些，也可以直接重写feign.Logger日志操作类，只关注写日志的过程。
5.1、修改application.yml配置（也可以用Bean修改）

logging:
  level:
    beinet.cn.demologfeign.feign.MyFeignLogger: debug  # 注意，这个要用你的代码里的包名替换

feign:
  client:
    config:
      default:
        logger-level: full

5.2、Bean定义：

@Configuration
public class FeignConfiguration {
    @Bean
    @ConditionalOnProperty("logging.level.beinet.cn.demologfeign.feign.MyFeignLogger")
    MyFeignLogger createMyLogger() {
        return new MyFeignLogger();
    }

5.3、MyFeignLogger日志重写实现：

package beinet.cn.demologfeign.feign;

import feign.Logger;
import feign.Request;
import feign.Response;
import feign.Util;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;

import static feign.Util.decodeOrDefault;
import static feign.form.util.CharsetUtil.UTF_8;

/**
 * 新类
 *
 * @author youbl
 * @date 2023/3/6 9:45
 */
@Slf4j
public class MyFeignLogger extends Logger {
    @Override
    protected void logRequest(String configKey, Level logLevel, Request request) {
        byte[] arrBody = request.body();
        String body = arrBody == null ? "" : new String(arrBody);
        log.info("[log request started]\n{} {}\nbody: {}\n{}",
                request.httpMethod(),
                request.url(),
                body,
                CombineHeaders(request.headers()));
    }

    @Override
    protected Response logAndRebufferResponse(String configKey,
                                              Level logLevel,
                                              Response response,
                                              long elapsedTime) {
        int status = response.status();

        String content = "";
        if (response.body() != null && !(status == 204 || status == 205)) {
            byte[] bodyData;
            try {
                bodyData = Util.toByteArray(response.body().asInputStream());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            if (bodyData.length > 0) {
                content = decodeOrDefault(bodyData, UTF_8, "Binary data");
            }
            response = response.toBuilder().body(bodyData).build();
        }

        log.info("[log request ended]\ncost time(ms): {} status:{} from {} {}\n{}\nBody:\n{}",
                elapsedTime,
                status,
                response.request().httpMethod(),
                response.request().url(),
                CombineHeaders(response.headers()),
                content);

        return response;
    }

    @Override
    protected void log(String configKey, String format, Object... args) {
        //log.info(String.format(methodTag(configKey) + format, args));
    }

    private static String CombineHeaders(Map<String, Collection<String>> headers) {
        StringBuilder sb = new StringBuilder();
        if (headers != null && !headers.isEmpty()) {
            sb.append("Headers:\r\n");
            for (Map.Entry<String, Collection<String>> ob : headers.entrySet()) {
                for (String val : ob.getValue()) {
                    sb.append("  ").append(ob.getKey()).append(": ").append(val).append("\r\n");
                }
            }
        }
        return sb.toString();
    }
}

6、使用Aspect切面输出日志(不推荐)

这个不推荐，因为它无法打印出具体的url、header等数据，大家可以参考：
不需要yml配置，直接在项目里添加如下代码即可：

package com.example.demo.feign;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

@Aspect
@Component
@Slf4j
public class FeignAspect {

    // 这个也行 @Pointcut("@annotation(org.springframework.web.bind.annotation.PostMapping)")
    // 参考 https://github.com/spring-cloud/spring-cloud-openfeign/issues/322
    @Pointcut("@within(org.springframework.cloud.openfeign.FeignClient)")
    public void feignClientPointcut() {
    }

    @Around("feignClientPointcut()")
    public Object feignAround(ProceedingJoinPoint joinPoint) throws Throwable {
        return logAround(joinPoint);
    }

    private static ObjectMapper mapper = new ObjectMapper();

    private Object logAround(ProceedingJoinPoint point) throws Throwable {
        long beginTime = System.currentTimeMillis();
        Object result = null;
        Exception exception = null;
        try {
            result = point.proceed();
        } catch (Exception exp) {
            exception = exp;
        }
        long time = System.currentTimeMillis() - beginTime;
        saveLog(point, result, exception, time);

        if (exception != null) {
            throw exception;
        }
        return result;
    }

    private static void saveLog(ProceedingJoinPoint joinPoint, Object result, Exception exception, long time) {
        Dto dto = new Dto();
        dto.setCostTime(time);

        try {
            if (exception != null) {
                dto.setExp(exception.toString());
            }
            if (result != null) {
                dto.setResult(serial(result));
            }
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();
            //请求的 类名、方法名
            String className = joinPoint.getTarget().getClass().getName();
            String signName = signature.getDeclaringTypeName();
            if (!signName.equalsIgnoreCase(className))
                signName += "|" + className;
            dto.setClas(signName);

            String methodName = signature.getName();
            dto.setMethod(methodName);

            //请求的参数
            Object[] args = joinPoint.getArgs();
            if (args != null && args.length > 0) {
                dto.setPara(serial(args));
            }
        } catch (Exception e) {
            dto.setExp(e.toString());
        }
        if (exception != null) {
            log.warn(dto.toString());
        } else {
            log.info(dto.toString());
        }
    }
    private static String serial(Object obj) {
        try {
            return mapper.writeValueAsString(obj);
        } catch (Exception ex) {
            return obj.toString();
        }
    }
    @Data
    private static class Dto {
        /**
         * 调用类名
         */
        private String clas;
        /**
         * 调用方法名
         */
        private String method;
        /**
         * 调用的参数
         */
        private String para;
        /**
         * 方法返回结果
         */
        private String result;
        /**
         * 执行时长，毫秒
         */
        private long costTime;
        /**
         * 备注
         */
        private String remark;

        /**
         * 出现的异常
         */
        private String exp;
    }
}

OK，输出的日志如下：

2020-10-13 14:24:48.321  INFO 21304 --- [nio-8080-exec-3] com.example.demo.feign.FeignAspect       : FeignAspect.Dto(clas=com.example.demo.feign.FeignDemo|com.sun.proxy.$Proxy72, method=test, para=null, result="<!DOCTYPE html>\r\n<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class=\"bg s_ipt_wr\"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus=autofocus></span><span class=\"bg s_btn_wr\"><input type=submit id=su value=百度一下 class=\"bg s_btn\" autofocus></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=https://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href=\"http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === \"\" ? \"?\" : \"&\")+ \"bdorz_come=1\")+ '\" name=\"tj_login\" class=\"lb\">登录</a>');\r\n                </script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style=\"display: block;\">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>使用百度前必读</a>&nbsp; <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a>&nbsp;京ICP证030173号&nbsp; <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>\r\n", costTime=22, remark=null, exp=null)

注：Feign官方文档：
https://cloud.spring.io/spring-cloud-openfeign/reference/html/

# java # spring boot
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