Spring Boot 2关于日志配置文件的使用

configuration节点

• scan=“true”，扫描配置文件改变
• scanPeriod=“10 seconds”，扫描时间间隔
• debug=“true”，可以输出日志框架的一些日志
• packagingData=“true”，可以输出jar包名称信息

appender 节点

//输出到控制台
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
        <charset>utf-8</charset>
        <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg%n</Pattern>
    </encoder>
</appender>

//输出到文件
<appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
        <level>INFO</level>
    </filter>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${user.home}/${logurl}/info-%d{yyyyMMdd}.log.%i</fileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>500MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
        <maxHistory>15</maxHistory>
    </rollingPolicy>
    <encoder>
        <charset>utf-8</charset>
        <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %reqId [%thread] %-5level %logger{36} -%msg%n</Pattern>
    </encoder>
</appender>

自定义encoder，输出额外信息

• 继承PatternLayoutEncoder

public class RequestPatternLayoutEncoder extends PatternLayoutEncoder {
    public static final String REQUEST_PATTERN = "reqId";
    @Override
    public void start() {
        PatternLayout patternLayout = new PatternLayout();
        patternLayout.getDefaultConverterMap().put(REQUEST_PATTERN, ReqIdConverter.class.getName());
        patternLayout.setContext(context);
        patternLayout.setPattern(getPattern());
        patternLayout.setOutputPatternAsHeader(outputPatternAsHeader);
        patternLayout.start();
        this.layout = patternLayout;
        this.started = true;
    }
}

• 继承ClassicConverter

public class ReqIdConverter extends ClassicConverter {
    @Override
    public String convert(ILoggingEvent event) {
        String id = RequestContext.getContext().getId();
        return id == null ? "---" : id;
    }
}

• 配置encoder

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder class="org.ghost.springboot2.demo.common.log.RequestPatternLayoutEncoder">
        <charset>utf-8</charset>
        <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %reqId [%thread] %-5level %logger{36} -%msg%n</Pattern>
    </encoder>
</appender>

logger与root节点

• root设置根节点默认配置
• logger可以设置到具体某个包，additivity是否向上传递到root

<root level="INFO">
    <appender-ref ref="INFO_FILE"/>
</root>
<logger name="org.ghost.springboot2.demo" level="DEBUG" additivity="true">
     <appender-ref ref="STDOUT"/>
 </logger>

springProfile节点

• 可以根据参数spring.profiles.active启动参数采用 不同的配置

<springProfile name="dev,test">
     <logger name="org.ghost.springboot2.demo" level="DEBUG" additivity="true">
         <appender-ref ref="STDOUT"/>
     </logger>
 </springProfile>

源码位置:
https://gitee.com/ceclar123/spring-boot-demo/tree/master/ch08

https://docs.spring.io/spring-boot/docs/2.2.0.BUILD-SNAPSHOT/reference/html/spring-boot-features.html#boot-features-custom-log-configuration
https://logback.qos.ch/manual/configuration.html