背景
Java打印日志时,输出自定义变量值(以logback为例)
步骤
1. 删除引入的基础配置类(如无则忽略)
<include resource="org/springframework/boot/logging/logback/base.xml"/>
2. 添加配置信息
traceId为自定义变量名,%X{traceId}必须都包含
<appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <pattern>%X{traceId} %d{HH:mm:ss.SSS} %-5level %logger Line:%-3L - %msg</pattern> <charset>utf-8</charset> </encoder> </appender>
<root LEVEL="info"> <appender-ref ref="Console"/> </root>
3. 代码中给自定义变量赋值
org.slf4j.MDC.put("traceId", UUID.randomUUID().toString()); log.info("test");