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SpringBoot集成TraceId的方案详解(追踪ID)

2025年12月03日 Java 我要评论
一、traceid 是什么?traceid 就是给每一条请求链路分配的全局唯一 “身份证号” —— 不管是单体项目里的一次接口请求,还是分布式微服务里跨

一、traceid 是什么?

  • traceid 就是给每一条请求链路分配的全局唯一 “身份证号” —— 不管是单体项目里的一次接口请求,还是分布式微服务里跨多个服务的调用流程,只要属于同一条请求链路,全程共用同一个 traceid。
  • 你可以把它理解成:用户在 app 点了 “下单” 按钮,这个请求从前端→网关→订单服务→用户服务→支付服务,整个流程会被分配一个唯一的 traceid,所有环节的日志、调用记录都带上这个 id。排查问题时,只要搜这个 traceid,就能把整条链路的日志 / 调用记录都揪出来,不用在海量日志里大海捞针。

场景一:无skywalking的最优实现

核心方案

mdc(日志上下文) + filter(入口生成/读取traceid) + taskdecorator(异步线程传递) + feign/resttemplate拦截器(微服务跨服务传递)

适用场景

  • 中小型单体/微服务项目;
  • 无可视化链路分析需求,仅需日志携带traceid定位问题;
  • 不愿引入额外中间件(skywalking oap)增加运维成本。

1. 依赖配置(拆分springboot/springcloud)

1.1 springboot单体项目依赖

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
         xsi:schemalocation="http://maven.apache.org/pom/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.7.15</version> <!-- 3.x可替换为3.2.0 -->
        <relativepath/>
    </parent>
    <groupid>com.example</groupid>
    <artifactid>boot-traceid-no-skywalking</artifactid>
    <version>0.0.1-snapshot</version>
    <dependencies>
        <!-- springboot web核心 -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <!-- 工具类:判空/字符串处理 -->
        <dependency>
            <groupid>org.apache.commons</groupid>
            <artifactid>commons-lang3</artifactid>
            <version>3.14.0</version>
        </dependency>
        <!-- 可选:hutool(雪花id生成) -->
        <dependency>
            <groupid>cn.hutool</groupid>
            <artifactid>hutool-all</artifactid>
            <version>5.8.22</version>
        </dependency>
        <!-- 测试依赖(非核心) -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
                <version>2.7.15</version>
            </plugin>
        </plugins>
    </build>
</project>

1.2 springcloud微服务项目依赖

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
         xsi:schemalocation="http://maven.apache.org/pom/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.7.15</version> <!-- 对应cloud 2021.0.x -->
        <relativepath/>
    </parent>
    <groupid>com.example</groupid>
    <artifactid>cloud-traceid-no-skywalking</artifactid>
    <version>0.0.1-snapshot</version>
    <dependencies>
        <!-- 基础依赖(同springboot) -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.apache.commons</groupid>
            <artifactid>commons-lang3</artifactid>
            <version>3.14.0</version>
        </dependency>
        <dependency>
            <groupid>cn.hutool</groupid>
            <artifactid>hutool-all</artifactid>
            <version>5.8.22</version>
        </dependency>
        <!-- 微服务核心:openfeign -->
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>
        <!-- 测试依赖 -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <!-- cloud版本管理 -->
    <dependencymanagement>
        <dependencies>
            <dependency>
                <groupid>org.springframework.cloud</groupid>
                <artifactid>spring-cloud-dependencies</artifactid>
                <version>2021.0.5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencymanagement>
    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
                <version>2.7.15</version>
            </plugin>
        </plugins>
    </build>
</project>

2. 核心代码实现(无skywalking专属)

2.1 traceid工具类(自定义生成/传递)

package com.example.traceid.util;
import cn.hutool.core.lang.snowflake;
import cn.hutool.core.net.netutil;
import cn.hutool.core.util.idutil;
import org.apache.commons.lang3.stringutils;
import org.slf4j.mdc;
import java.util.uuid;
/**
 * 无skywalking时:自定义traceid生成/管理工具类
 */
public class traceidutils {
    // mdc中traceid的key(日志配置用%x{traceid}读取)
    public static final string trace_id_mdc_key = "traceid";
    // http头传递traceid的key
    public static final string trace_id_header_key = "x-trace-id";
    // 雪花id生成器(高并发用,单机/低并发可只用uuid)
    private static final snowflake snowflake = idutil.createsnowflake(
            netutil.ipv4tolong(netutil.getlocalhoststr()) % 32, 1l
    );
    /**
     * 生成traceid:低并发用uuid,高并发用雪花id
     */
    public static string generatetraceid() {
        // 方案1:uuid(默认,无需额外依赖)
        return uuid.randomuuid().tostring().replace("-", "");
        // 方案2:雪花id(高并发切换)
        // return snowflake.nextidstr();
    }
    /**
     * 从mdc获取traceid,兜底返回unknown
     */
    public static string gettraceid() {
        string traceid = mdc.get(trace_id_mdc_key);
        return stringutils.isblank(traceid) ? "unknown" : traceid;
    }
    /**
     * 手动设置traceid到mdc
     */
    public static void settraceidtomdc(string traceid) {
        if (stringutils.isnotblank(traceid)) {
            mdc.put(trace_id_mdc_key, traceid);
        }
    }
    /**
     * 清除mdc中的traceid
     */
    public static void cleartraceidfrommdc() {
        mdc.remove(trace_id_mdc_key);
    }
}

2.2 traceid过滤器(请求入口生成/读取traceid)

package com.example.traceid.filter;
import com.example.traceid.util.traceidutils;
import org.apache.commons.lang3.stringutils;
import org.slf4j.mdc;
import org.springframework.core.ordered;
import org.springframework.core.annotation.order;
import org.springframework.stereotype.component;
import javax.servlet.*;
import javax.servlet.http.httpservletrequest;
import java.io.ioexception;
/**
 * 无skywalking时:请求入口生成/读取traceid,放入mdc
 * 优先级最高,保证所有逻辑执行前已有traceid
 */
@component
@order(ordered.highest_precedence)
public class traceidmdcfilter implements filter {
    @override
    public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception {
        try {
            httpservletrequest httprequest = (httpservletrequest) request;
            // 1. 优先读取上游传递的traceid(网关/其他服务)
            string traceid = httprequest.getheader(traceidutils.trace_id_header_key);
            // 2. 上游无则生成新的
            if (stringutils.isblank(traceid)) {
                traceid = traceidutils.generatetraceid();
            }
            // 3. 放入mdc,供日志读取
            mdc.put(traceidutils.trace_id_mdc_key, traceid);
            // 4. 执行后续逻辑
            chain.dofilter(request, response);
        } finally {
            // 核心:请求结束清除mdc,避免线程池复用导致traceid错乱
            mdc.clear();
        }
    }
}

2.3 异步线程池配置(解决异步traceid丢失)

package com.example.traceid.config;
import org.slf4j.mdc;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.core.task.taskdecorator;
import org.springframework.scheduling.annotation.enableasync;
import org.springframework.scheduling.concurrent.threadpooltaskexecutor;
import java.util.map;
import java.util.concurrent.executor;
import java.util.concurrent.threadpoolexecutor;
/**
 * 无skywalking时:异步线程池配置,传递mdc上下文
 */
@configuration
@enableasync
public class asynctraceconfig {
    // 自定义taskdecorator:复制父线程mdc到子线程
    private static class mdctracedecorator implements taskdecorator {
        @override
        public runnable decorate(runnable runnable) {
            map<string, string> parentmdc = mdc.getcopyofcontextmap();
            return () -> {
                try {
                    if (parentmdc != null) {
                        mdc.setcontextmap(parentmdc);
                    }
                    runnable.run();
                } finally {
                    mdc.clear(); // 子线程执行完清除mdc
                }
            };
        }
    }
    // 全局异步线程池
    @bean("asynctraceexecutor")
    public executor asynctraceexecutor() {
        threadpooltaskexecutor executor = new threadpooltaskexecutor();
        int core = runtime.getruntime().availableprocessors() * 2;
        executor.setcorepoolsize(core);
        executor.setmaxpoolsize(core * 2);
        executor.setqueuecapacity(200);
        executor.setthreadnameprefix("async-trace-");
        executor.settaskdecorator(new mdctracedecorator()); // 绑定装饰器
        executor.setrejectedexecutionhandler(new threadpoolexecutor.callerrunspolicy());
        executor.setwaitfortaskstocompleteonshutdown(true);
        executor.setawaitterminationseconds(30);
        executor.initialize();
        return executor;
    }
}

2.4 微服务跨服务传递(feign/resttemplate拦截器)

2.4.1 feign拦截器(微服务专属)
package com.example.traceid.interceptor;
import com.example.traceid.util.traceidutils;
import feign.requestinterceptor;
import feign.requesttemplate;
import org.springframework.stereotype.component;
/**
 * 无skywalking时:feign调用传递traceid
 */
@component
public class feigntraceinterceptor implements requestinterceptor {
    @override
    public void apply(requesttemplate template) {
        string traceid = traceidutils.gettraceid();
        if (!"unknown".equals(traceid)) {
            template.header(traceidutils.trace_id_header_key, traceid);
        }
    }
}
2.4.2 resttemplate拦截器(微服务专属)
package com.example.traceid.config;
import com.example.traceid.util.traceidutils;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.http.client.clienthttprequestinterceptor;
import org.springframework.web.client.resttemplate;
import java.util.collections;
/**
 * 无skywalking时:resttemplate传递traceid
 */
@configuration
public class resttemplatetraceconfig {
    @bean
    public resttemplate resttemplate() {
        resttemplate resttemplate = new resttemplate();
        resttemplate.setinterceptors(collections.singletonlist((request, body, execution) -> {
            string traceid = traceidutils.gettraceid();
            if (!"unknown".equals(traceid)) {
                request.getheaders().add(traceidutils.trace_id_header_key, traceid);
            }
            return execution.execute(request, body);
        }));
        return resttemplate;
    }
}

2.5 日志配置(logback-spring.xml)

<?xml version="1.0" encoding="utf-8"?>
<configuration scan="true" scanperiod="30 seconds">
    <contextname>traceid-no-skywalking</contextname>
    <!-- 控制台输出 -->
    <appender name="console" class="ch.qos.logback.core.consoleappender">
        <encoder>
            <charset>utf-8</charset>
            <!-- 核心:%x{traceid}读取mdc中的traceid -->
            <pattern>%d{yyyy-mm-dd hh:mm:ss.sss} [%thread] [%x{traceid}] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>
    <!-- 文件输出 -->
    <appender name="file" class="ch.qos.logback.core.rolling.rollingfileappender">
        <file>logs/app.log</file>
        <rollingpolicy class="ch.qos.logback.core.rolling.timebasedrollingpolicy">
            <filenamepattern>logs/app.%d{yyyy-mm-dd}.log</filenamepattern>
            <maxhistory>7</maxhistory>
            <maxfilesize>100mb</maxfilesize>
        </rollingpolicy>
        <encoder>
            <charset>utf-8</charset>
            <pattern>%d{yyyy-mm-dd hh:mm:ss.sss} [%thread] [%x{traceid}] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>
    <root level="info">
        <appender-ref ref="console"/>
        <appender-ref ref="file"/>
    </root>
</configuration>

3. 无skywalking的核心验证

  • 同步接口:日志中[%x{traceid}]显示自定义生成的traceid;
  • 异步任务:子线程日志traceid与父线程一致;
  • 微服务调用:下游服务日志traceid与上游一致;
  • 无任何额外中间件依赖,仅依赖spring原生能力。

场景二:有skywalking的最优实现

核心方案

复用skywalking traceid + mdc绑定 + 上下文传递(异步/跨服务)

核心差异

  • 无需自定义生成traceid,直接复用skywalking的全局traceid;
  • 日志中同时绑定skywalking traceid,实现「日志traceid=链路traceid」;
  • 异步/跨服务场景需传递skywalking上下文,保证链路不中断。

1. 依赖配置(拆分springboot/springcloud)

1.1 springboot单体项目(新增skywalking依赖)

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
         xsi:schemalocation="http://maven.apache.org/pom/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.7.15</version>
        <relativepath/>
    </parent>
    <groupid>com.example</groupid>
    <artifactid>boot-traceid-with-skywalking</artifactid>
    <version>0.0.1-snapshot</version>
    <dependencies>
        <!-- 基础依赖(同无skywalking) -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.apache.commons</groupid>
            <artifactid>commons-lang3</artifactid>
            <version>3.14.0</version>
        </dependency>
        <!-- skywalking核心依赖 -->
        <dependency>
            <groupid>org.apache.skywalking</groupid>
            <artifactid>apm-toolkit-spring-boot-starter</artifactid>
            <version>8.16.0</version> <!-- 与skywalking oap版本一致 -->
        </dependency>
        <!-- skywalking日志增强:自动绑定traceid到mdc -->
        <dependency>
            <groupid>org.apache.skywalking</groupid>
            <artifactid>apm-toolkit-logback-1.x</artifactid>
            <version>8.16.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
                <version>2.7.15</version>
            </plugin>
        </plugins>
    </build>
</project>

1.2 springcloud微服务项目(新增skywalking依赖)

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
         xsi:schemalocation="http://maven.apache.org/pom/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.7.15</version>
        <relativepath/>
    </parent>
    <groupid>com.example</groupid>
    <artifactid>cloud-traceid-with-skywalking</artifactid>
    <version>0.0.1-snapshot</version>
    <dependencies>
        <!-- 基础依赖(同无skywalking) -->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>
        <dependency>
            <groupid>org.apache.commons</groupid>
            <artifactid>commons-lang3</artifactid>
            <version>3.14.0</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>
        <!-- skywalking核心依赖 -->
        <dependency>
            <groupid>org.apache.skywalking</groupid>
            <artifactid>apm-toolkit-spring-boot-starter</artifactid>
            <version>8.16.0</version>
        </dependency>
        <!-- skywalking feign增强:跨服务链路追踪 -->
        <dependency>
            <groupid>org.apache.skywalking</groupid>
            <artifactid>apm-toolkit-feign</artifactid>
            <version>8.16.0</version>
        </dependency>
        <!-- skywalking日志增强 -->
        <dependency>
            <groupid>org.apache.skywalking</groupid>
            <artifactid>apm-toolkit-logback-1.x</artifactid>
            <version>8.16.0</version>
        </dependency>
    </dependencies>
    <dependencymanagement>
        <dependencies>
            <dependency>
                <groupid>org.springframework.cloud</groupid>
                <artifactid>spring-cloud-dependencies</artifactid>
                <version>2021.0.5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencymanagement>
    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
                <version>2.7.15</version>
            </plugin>
        </plugins>
    </build>
</project>

2. skywalking极简部署(docker,中小型项目首选)

# 1. 拉取oap和ui镜像(版本与项目依赖一致)
docker pull apache/skywalking-oap-server:8.16.0
docker pull apache/skywalking-ui:8.16.0
# 2. 启动oap(单节点,h2存储,无需额外数据库)
docker run -d \
  --name skywalking-oap \
  -p 11800:11800 \ # agent上报端口
  -p 12800:12800 \ # ui访问oap端口
  -e sw_storage=h2 \
  apache/skywalking-oap-server:8.16.0
# 3. 启动ui(可视化界面,访问http://localhost:8080)
docker run -d \
  --name skywalking-ui \
  -p 8080:8080 \
  --link skywalking-oap:oap \
  -e sw_oap_address=http://oap:12800 \
  apache/skywalking-ui:8.16.0

3. 核心代码实现(有skywalking专属)

3.1 traceid工具类(复用skywalking traceid)

package com.example.traceid.util;
import org.apache.commons.lang3.stringutils;
import org.apache.skywalking.apm.toolkit.trace.tracecontext;
import org.slf4j.mdc;
/**
 * 有skywalking时:复用其traceid,无需自定义生成
 */
public class traceidutils {
    // 复用skywalking的mdc key(sw_trace_id),也可自定义
    public static final string trace_id_mdc_key = "sw_trace_id";
    public static final string trace_id_header_key = "x-trace-id";
    /**
     * 获取traceid:优先skywalking,兜底unknown
     */
    public static string gettraceid() {
        // skywalking原生traceid
        string skywalkingtraceid = tracecontext.traceid();
        if (stringutils.isnotblank(skywalkingtraceid) && !"n/a".equals(skywalkingtraceid)) {
            return skywalkingtraceid;
        }
        // 兜底读取mdc
        string mdctraceid = mdc.get(trace_id_mdc_key);
        return stringutils.isblank(mdctraceid) ? "unknown" : mdctraceid;
    }
    /**
     * 绑定skywalking traceid到mdc(仅特殊场景用)
     */
    public static void bindskywalkingtraceidtomdc() {
        string traceid = tracecontext.traceid();
        if (stringutils.isnotblank(traceid) && !"n/a".equals(traceid)) {
            mdc.put(trace_id_mdc_key, traceid);
        }
    }
}

3.2 traceid过滤器(简化:仅绑定skywalking traceid到mdc)

package com.example.traceid.filter;
import com.example.traceid.util.traceidutils;
import org.apache.skywalking.apm.toolkit.trace.tracecontext;
import org.slf4j.mdc;
import org.springframework.core.ordered;
import org.springframework.core.annotation.order;
import org.springframework.stereotype.component;
import javax.servlet.*;
import java.io.ioexception;
/**
 * 有skywalking时:过滤器仅绑定其traceid到mdc,无需生成
 */
@component
@order(ordered.highest_precedence)
public class traceidmdcfilter implements filter {
    @override
    public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception {
        try {
            // 绑定skywalking traceid到mdc,供日志读取
            traceidutils.bindskywalkingtraceidtomdc();
            chain.dofilter(request, response);
        } finally {
            mdc.clear();
            // 释放skywalking上下文(避免内存泄漏)
            tracecontext.release();
        }
    }
}

3.3 异步线程池配置(传递skywalking上下文)

package com.example.traceid.config;
import org.apache.skywalking.apm.toolkit.trace.tracecontext;
import org.slf4j.mdc;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.core.task.taskdecorator;
import org.springframework.scheduling.annotation.enableasync;
import org.springframework.scheduling.concurrent.threadpooltaskexecutor;
import java.util.map;
import java.util.concurrent.executor;
import java.util.concurrent.threadpoolexecutor;
/**
 * 有skywalking时:异步线程池传递mdc+skywalking上下文
 */
@configuration
@enableasync
public class asynctraceconfig {
    private static class mdctracedecorator implements taskdecorator {
        @override
        public runnable decorate(runnable runnable) {
            // 复制父线程mdc和skywalking traceid
            map<string, string> parentmdc = mdc.getcopyofcontextmap();
            string parentskywalkingtraceid = tracecontext.traceid();
            return () -> {
                try {
                    // 子线程绑定mdc
                    if (parentmdc != null) {
                        mdc.setcontextmap(parentmdc);
                    }
                    // 子线程绑定skywalking traceid(核心:保证链路不中断)
                    if (stringutils.isnotblank(parentskywalkingtraceid) && !"n/a".equals(parentskywalkingtraceid)) {
                        tracecontext.continuetrace(parentskywalkingtraceid);
                    }
                    runnable.run();
                } finally {
                    mdc.clear();
                    tracecontext.release(); // 释放skywalking上下文
                }
            };
        }
    }
    @bean("asynctraceexecutor")
    public executor asynctraceexecutor() {
        threadpooltaskexecutor executor = new threadpooltaskexecutor();
        int core = runtime.getruntime().availableprocessors() * 2;
        executor.setcorepoolsize(core);
        executor.setmaxpoolsize(core * 2);
        executor.setqueuecapacity(200);
        executor.setthreadnameprefix("async-trace-");
        executor.settaskdecorator(new mdctracedecorator());
        executor.setrejectedexecutionhandler(new threadpoolexecutor.callerrunspolicy());
        executor.initialize();
        return executor;
    }
}

3.4 日志配置(绑定skywalking traceid)

<?xml version="1.0" encoding="utf-8"?>
<configuration scan="true" scanperiod="30 seconds">
    <!-- 引入skywalking默认配置 -->
    <include resource="org/apache/skywalking/apm/toolkit/log/logback/default.xml"/>
    <contextname>traceid-with-skywalking</contextname>
    <appender name="console" class="ch.qos.logback.core.consoleappender">
        <encoder>
            <charset>utf-8</charset>
            <!-- %x{sw_trace_id}:skywalking原生traceid -->
            <pattern>%d{yyyy-mm-dd hh:mm:ss.sss} [%thread] [%x{sw_trace_id}] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>
    <appender name="file" class="ch.qos.logback.core.rolling.rollingfileappender">
        <file>logs/app.log</file>
        <rollingpolicy class="ch.qos.logback.core.rolling.timebasedrollingpolicy">
            <filenamepattern>logs/app.%d{yyyy-mm-dd}.log</filenamepattern>
            <maxhistory>7</maxhistory>
            <maxfilesize>100mb</maxfilesize>
        </rollingpolicy>
        <encoder>
            <charset>utf-8</charset>
            <pattern>%d{yyyy-mm-dd hh:mm:ss.sss} [%thread] [%x{sw_trace_id}] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>
    <root level="info">
        <appender-ref ref="console"/>
        <appender-ref ref="file"/>
    </root>
</configuration>

3.5 项目挂载skywalking agent(核心步骤)

启动项目时添加jvm参数(本地/生产通用):

# 本地idea vm options
-javaagent:/path/to/skywalking-agent/skywalking-agent.jar
-dsw_agent_name=boot-traceid-demo # 服务名(ui中显示)
-dsw_agent_collector_backend_services=127.0.0.1:11800 # oap地址
# 生产jar启动
java -javaagent:/path/to/skywalking-agent/skywalking-agent.jar \
  -dsw_agent_name=cloud-traceid-demo \
  -dsw_agent_collector_backend_services=192.168.1.100:11800 \
  -jar app.jar

4. 有skywalking的核心验证

  • 日志中[%x{sw_trace_id}]显示skywalking的全局traceid;
  • 异步任务:子线程traceid与父线程一致,skywalking ui可看到异步链路;
  • 微服务调用:上下游traceid一致,skywalking ui可看到跨服务完整链路;
  • 访问skywalking ui(http://localhost:8080),可通过traceid搜索整条链路。

核心差异总结

维度无skywalking(纯自研)有skywalking(复用traceid)
traceid生成自定义(uuid/雪花id)复用skywalking全局traceid(无需自定义)
核心目标日志携带traceid,定位问题日志+可视化链路统一,支持跨服务/异步链路分析
运维成本0(仅代码)低(单节点docker部署oap+ui)
异步/跨服务处理仅传递mdc上下文传递mdc+skywalking上下文(保证链路不中断)
日志配置读取自定义mdc key(traceid)读取skywalking mdc key(sw_trace_id)

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