一次服务调用，在业务中可以一次追查到本次服务调用涉及的本地服务方法，第三方服务接口。实现日志的链路追踪。保证日志的高查找性。
实现步骤
1、pom.xml 依赖
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<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</dependency>
<!--lombok配置-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.10</version>
</dependency>
</dependencies>
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2、整合logback，打印日志，logback.xml (日志配置文件)
关键代码：[traceId:%X{traceId}]，traceId是通过拦截器里MDC.put(traceId, tid)添加。
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<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false">
<!--日志存储路径-->
<property name="log" value="D:/test/log" />
<!-- 控制台输出 -->
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<!--输出格式化-->
<pattern>[traceId:%X{traceId}] %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
</encoder>
</appender>
<!-- 按天生成日志文件 -->
<appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!--日志文件名-->
<FileNamePattern>${log}/%d{yyyy-MM-dd}.log</FileNamePattern>
<!--保留天数-->
<MaxHistory>30</MaxHistory>
</rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>[traceId:%X{traceId}] %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
</encoder>
<!--日志文件最大的大小-->
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>10MB</MaxFileSize>
</triggeringPolicy>
</appender>
<!-- 日志输出级别 -->
<root level="INFO">
<appender-ref ref="console" />
<appender-ref ref="file" />
</root>
</configuration>
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3、application.yml指定logback.xml配置目录
logging:
config: classpath:logback.xml
4、异步线程的跟踪ID链路追踪
业务逻辑是基于线程数据的传递进行处理，主线程传递线程ID到子线程。处理方式：重写线程池的execute（*）、submit（*）方法。
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public final class MyThreadPoolTaskExecutor extends ThreadPoolTaskExecutor {
public MyThreadPoolTaskExecutor() {
super();
}
@Override
public void execute(Runnable task) {
super.execute(TraceIdUtil.wrap(task, MDC.getCopyOfContextMap()));
}
@Override
public <T> Future<T> submit(Callable<T> task) {
return super.submit(TraceIdUtil.wrap(task, MDC.getCopyOfContextMap()));
}
@Override
public Future<?> submit(Runnable task) {
return super.submit(TraceIdUtil.wrap(task, MDC.getCopyOfContextMap()));
}
}
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4、异步定时任务线程接口ScheduledExecutorService的日志链路追踪。在执行前，执行后进行跟踪ID的生成和删除。
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@Bean(name = "scheduledExecutorService")
protected ScheduledExecutorService scheduledExecutorService() {
return new ScheduledThreadPoolExecutor(corePoolSize,
new BasicThreadFactory.Builder().namingPattern("schedule-pool-%d").daemon(true).build(),
new ThreadPoolExecutor.CallerRunsPolicy()) {
@Override
protected void beforeExecute(Thread thread, Runnable runnable) {
super.beforeExecute(thread, runnable);
// 为定时任务生成一个 traceId
TraceIdUtil.setTraceId();
// 可选：添加任务标识
System.out.println("Scheduled task starting with traceId: " + TraceIdUtil.getTraceId());
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
Threads.printException(r, t);
TraceIdUtil.remove();
}
};
}
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