how to specify specific logger level for each of file writing and console writing

I want to maintain a log of only WARN, ERROR and FATAL in my logfile.log whereas want all above INFO to be written to console in my spring boot application. I see that when I do log.level.root=WARN, in application.properties file it sets a log level of WARN for the whole application. What can I do for displaying all log messages in console but writing only ones above WARN in the file?

Also!!!! Is there a way to set level to INFO and write only certain specified logs in the file. For eg. I want to trace each and every logins/logouts/filechanges (say business logic related) in log with INFO level but don't want to see the default INFO messages that pop up during the start of the application like

2018-07-11 10:19:00.554 INFO 11190 --- [ main] c.v.guruji.GurujiApplication : Started GurujiApplication in 10.307 seconds (JVM running for 11.029) .

Solution

Well , I went through some logback documentations and pretty much figured out what to do.

I'm posting this code for others who'll be having such problems as me for quick reference.

But I'll suggest to go through a proper documentation at first to understand it clearly.

logback.xml(for logging each level log in a separate file and to show all at console)

<?xml version="1.0" encoding="UTF-8"?>

<property name="DEV_HOME" value="logs" />

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <layout class="ch.qos.logback.classic.PatternLayout">
        <Pattern>
            %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
        </Pattern>
    </layout>
</appender>



<appender name="FILE-ERROR"
          class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${DEV_HOME}/error.log</file>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
        <level>ERROR</level>
        <onMatch>ACCEPT</onMatch>
        <onMismatch>DENY</onMismatch>
    </filter>
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <Pattern>
            %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
        </Pattern>
    </encoder>

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!-- rollover daily -->
        <fileNamePattern>${DEV_HOME}/archived/error.%d{yyyy-MM-dd}.%i.log
        </fileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy
                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>10MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </rollingPolicy>

</appender>



<appender name="FILE-INFO"
          class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${DEV_HOME}/info.log</file>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
        <level>INFO</level>
        <onMatch>ACCEPT</onMatch>
        <onMismatch>DENY</onMismatch>
    </filter>
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <Pattern>
            %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
        </Pattern>
    </encoder>

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!-- rollover daily -->
        <fileNamePattern>${DEV_HOME}/archived/info.%d{yyyy-MM-dd}.%i.log
        </fileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy
                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>10MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </rollingPolicy>

</appender>



<appender name="FILE-FATAL"
          class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${DEV_HOME}/fatal.log</file>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
        <level>FATAL</level>
        <onMatch>ACCEPT</onMatch>
        <onMismatch>DENY</onMismatch>
    </filter>
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <Pattern>
            %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
        </Pattern>
    </encoder>

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!-- rollover daily -->
        <fileNamePattern>${DEV_HOME}/archived/fatal.%d{yyyy-MM-dd}.%i.log
        </fileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy
                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>10MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </rollingPolicy>

</appender>


<appender name="FILE-WARN"
          class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${DEV_HOME}/warn.log</file>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
        <level>WARN</level>
        <onMatch>ACCEPT</onMatch>
        <onMismatch>DENY</onMismatch>
    </filter>
    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <Pattern>
            %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
        </Pattern>
    </encoder>

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!-- rollover daily -->
        <fileNamePattern>${DEV_HOME}/archived/warn.%d{yyyy-MM-dd}.%i.log
        </fileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy
                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>10MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </rollingPolicy>

</appender>


<!-- Send logs to both console and file audit -->

<logger name="com.vaidiksanatansewa.guruji" level="fatal"
        additivity="false">

    <appender-ref ref="FILE-FATAL" />
</logger>


<logger name="com.vaidiksanatansewa.guruji" level="error"
        additivity="false">

    <appender-ref ref="FILE-ERROR" />
</logger>


<logger name="com.vaidiksanatansewa.guruji" level="warn"
        additivity="false">

    <appender-ref ref="FILE-WARN" />
</logger>


<logger name="com.vaidiksanatansewa.guruji" level="info"
        additivity="false">

    <appender-ref ref="FILE-INFO" />
</logger>

<root level="INFO">
    <appender-ref ref="STDOUT" />
</root>