Spring Boot Logback 配置日志输出到不同文件

场景：一个 Spring Boot + Quartz 的工程，做电水气能的计算定时任务。希望电水气的计算任务执行日志，分成不同文件输出。

实现 logback-spring.xml 如下：

xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds">
    
    <!-- 上下文名称 -->
    <contextName>etl-demo</contextName>
    
    <!--  
        自定义转换词  
        下面三行是从 spring-boot-2.7.18.jar 中 org/springframework/boot/logging/logback/defaults.xml 文件中拷贝的  
     -->
    <conversionRule conversionWord="clr" converterClass="org.springframework.boot.logging.logback.ColorConverter"/>
    <conversionRule conversionWord="wex" converterClass="org.springframework.boot.logging.logback.WhitespaceThrowableProxyConverter"/>
    <conversionRule conversionWord="wEx" converterClass="org.springframework.boot.logging.logback.ExtendedWhitespaceThrowableProxyConverter"/>
    
    <!-- 定义日志打印格式 -->
    <property name="SOUT_LOG_PATTERN" value="%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%5level) %clr(${PID:- }){magenta} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n%wEx"/>
    <property name="FILE_LOG_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} %5level ${PID:- } [%15.15t] %-40.40logger{39} : %m%n%wEx"/>
    <property name="SOUT_LOG_CHARSET" value="UTF-8"/>
    <property name="FILE_LOG_CHARSET" value="UTF-8"/>
    
    <appender name="SOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>${SOUT_LOG_PATTERN}</pattern>
            <charset>${SOUT_LOG_CHARSET}</charset>
        </encoder>
    </appender>
    
    <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
        <!-- discriminator 鉴别器，根据 taskName 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>taskName</key>
            <defaultValue>default</defaultValue>
        </discriminator>
        <sift>
            <!-- 具体的写日志 appender，每一个 taskName 创建一个文件-->
            <appender name="FILE-${taskName}" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <encoder>
                    <pattern>${FILE_LOG_PATTERN}</pattern>
                    <charset>${FILE_LOG_CHARSET}</charset>
                </encoder>
                <file>D:\gitsrd\gsta-ems\ems-etl-plus\etl-demo\logs\etl-demo-${taskName}.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
                    <fileNamePattern>etl-demo-${taskName}-%d{yyyy-MM-dd}-%i.gz</fileNamePattern>
                    <cleanHistoryOnStart>false</cleanHistoryOnStart>
                    <maxFileSize>10MB</maxFileSize>
                    <totalSizeCap>0</totalSizeCap>
                    <maxHistory>7</maxHistory>
                </rollingPolicy>
            </appender>
        </sift>
    </appender>
    
    <logger name="org.apache.catalina.startup.DigesterFactory" level="ERROR"/>
    <logger name="org.apache.catalina.util.LifecycleBase" level="ERROR"/>
    <logger name="org.apache.coyote.http11.Http11NioProtocol" level="WARN"/>
    <logger name="org.apache.sshd.common.util.SecurityUtils" level="WARN"/>
    <logger name="org.apache.tomcat.util.net.NioSelectorPool" level="WARN"/>
    <logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="ERROR"/>
    <logger name="org.hibernate.validator.internal.util.Version" level="WARN"/>
    <logger name="org.springframework.boot.actuate.endpoint.jmx" level="WARN"/>
    
    <root level="INFO">
        <appender-ref ref="SOUT"/>
        <appender-ref ref="SIFT"/>
    </root>
    
</configuration>

在代码中使用 MDC 写入任务名称：

java
package com.gsta.ems.etl.plus.demo.job;  
  
import com.gsta.ems.etl.plus.core.calc.ECalcService;  
import com.gsta.ems.etl.plus.core.clean.ECleanService;  
import lombok.RequiredArgsConstructor;  
import lombok.extern.slf4j.Slf4j;  
import org.quartz.DisallowConcurrentExecution;  
import org.quartz.JobExecutionContext;  
import org.quartz.JobExecutionException;  
import org.slf4j.MDC;  
import org.springframework.scheduling.quartz.QuartzJobBean;  
import org.springframework.stereotype.Component;  
  
  
@Slf4j  
@Component  
@RequiredArgsConstructor  
@DisallowConcurrentExecution  
public class ECalcJob extends QuartzJobBean {  
  
    public static final String NAME = "ECalcJob";  
    public static final String DESCRIPTION = "负责计算电能数据（15min、hour、day、month、year）";  
  
    private final ECleanService eCleanService;  
    private final ECalcService eCalcService;  
  
    @Override  
    protected void executeInternal(JobExecutionContext context) throws JobExecutionException {  
        MDC.put("taskName","ecalc");  
        log.info("------------------------------ 模拟 清洗电表数据 ------------------------------");  
        log.info("------------------------------ 模拟 电能数据 ------------------------------");  
        MDC.remove("taskName");  
    }  
  
}

参考：