Springboot MDC+logback实现日志追踪的方法

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class TokenInterceptor implements HandlerInterceptor {
    private static final Logger logger = LoggerFactory.getLogger(TokenInterceptor.class);
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        //添加MDC日志
        String appkey = request.getHeader("appkey");
        MDC.put("logTrackId", appkey);
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        //移除MDC日志
        MDC.remove("logTrackId");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <property name="logLevel" value="INFO"></property>
    <property name="logPath" value="./logs"></property>
    <property name="maxHistory" value="31"/>
    <property name="maxFileSize" value="100MB"/>
    <property name="totalSizeCap" value="200GB"/>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss} %-4relative [%thread] [%X{logTrackId}] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>
    <appender name="FILE_INFO" class="ch.qos.logback.classic.sift.SiftingAppender">
        <!--discriminator鉴别器，根据logTrackId这个key对应的value鉴别日志事件，然后委托给具体appender写日志-->
        <discriminator>
            <key>logTrackId</key>
            <defaultValue>default</defaultValue>
        </discriminator>
        <sift>
            <!--具体的写日志appender，每一个logTrackId创建一个文件-->
            <appender name="FILE-${logTrackId}" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <!--直接指定文件路径-->
                <append>true</append>
                <encoder charset="UTF-8">
                    <pattern>%d{yyyy-MM-dd HH:mm:ss} %-4relative [%thread] [%X{logTrackId}] %-5level %logger{35} - %msg%n</pattern>
                </encoder>
                <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
                    <!--定义文件滚动时的文件名的格式-->
                    <fileNamePattern>${logPath}/%d{yyyy-MM-dd}/${logTrackId}-%i.log</fileNamePattern>
                    <maxHistory>${maxHistory}</maxHistory>
                    <maxFileSize>${maxFileSize}</maxFileSize>
                    <totalSizeCap>${totalSizeCap}</totalSizeCap>
                </rollingPolicy>
                <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                    <level>INFO</level>
                </filter>
            </appender>
        </sift>
    </appender>
    <!-- 异步输出 -->
    <appender name="ASYNC-INFO" class="ch.qos.logback.classic.AsyncAppender">
        <!-- 不丢失日志.默认的,如果队列的80%已满,则会丢弃TRACT、DEBUG、INFO级别的日志 -->
        <discardingThreshold>0</discardingThreshold>
        <!-- 更改默认的队列的深度,该值会影响性能.默认值为256 -->
        <queueSize>512</queueSize>
        <!-- 添加附加的appender,最多只能添加一个 -->
        <appender-ref ref="FILE_INFO"/>
    </appender>
    <root level="${logLevel}">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="FILE_INFO"/>
    </root>
</configuration>

MDC.put("requestId", "12345");
// ... logging statements ...
MDC.remove("requestId");

public class Main {
    private static final String KEY = "requestId";
    private static final Logger logger = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) {
        // 入口传入请求ID
        MDC.put(KEY, UUID.randomUUID().toString());
        // 打印日志
        logger.debug("log in main thread 1");
        logger.debug("log in main thread 2");
        logger.debug("log in main thread 3");
        // 出口移除请求ID
        MDC.remove(KEY);
    }
}

public class Main {
    private static final String KEY = "requestId";
    private static final Logger logger = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) {
        // 入口传入请求ID
        MDC.put(KEY, UUID.randomUUID().toString());
        // 主线程打印<font style="color: #1e6bb8;word-wrap: break-word;font-weight: bold;border-bottom: 1px solid">日志</font>
        logger.debug("log in main thread");
        // 异步线程打印<font style="color: #1e6bb8;word-wrap: break-word;font-weight: bold;border-bottom: 1px solid">日志</font>
        new Thread(new Runnable() {
            @Override
            public void run() {
                logger.debug("log in other thread");
            }
        }).start();
        // 出口移除请求ID
        MDC.remove(KEY);
    }
}

public class MDCRunnable implements Runnable {
    private final Runnable runnable;
    private final Map<String, String> map;
    public MDCRunnable(Runnable runnable) {
        this.runnable = runnable;
        // 保存当前线程的MDC值
        this.map = MDC.getCopyOfContextMap();
    }
    @Override
    public void run() {
        // 传入已保存的MDC值
        for (Map.Entry<String, String> entry : map.entrySet()) {
            MDC.put(entry.getKey(), entry.getValue());
        }
        // 装饰器模式，执行run方法
        runnable.run();
        // 移除已保存的MDC值
        for (Map.Entry<String, String> entry : map.entrySet()) {
            MDC.remove(entry.getKey());
        }
    }
}

public class Main {
    private static final String KEY = "requestId";
    private static final Logger logger = LoggerFactory.getLogger(Main.class);
    private static final ExecutorService EXECUTOR = Executors.newSingleThreadExecutor();
    public static void main(String[] args) {
        // 入口传入请求ID
        MDC.put(KEY, UUID.randomUUID().toString());
        // 主线程打印<font style="color: #1e6bb8;word-wrap: break-word;font-weight: bold;border-bottom: 1px solid">日志</font>
        logger.debug("log in main thread");
        // 异步线程打印<font style="color: #1e6bb8;word-wrap: break-word;font-weight: bold;border-bottom: 1px solid">日志</font>，用MDCRunnable装饰Runnable
        new Thread(new MDCRunnable(new Runnable() {
            @Override
            public void run() {
                logger.debug("log in other thread");
            }
        })).start();
        // 异步线程池打印日志，用MDCRunnable装饰Runnable
        EXECUTOR.execute(new MDCRunnable(new Runnable() {
            @Override
            public void run() {
                logger.debug("log in other thread pool");
            }
        }));
        EXECUTOR.shutdown();
        // 出口移除请求ID
        MDC.remove(KEY);
    }
}