slf4j配置以记录单个文件

Question

logback.spring.xml is configured to log only on single class

<logger name="classname">
        <appender-ref ref="AUDIT_LOG"/>
</logger>

In the class there is only 1 call to log. But when i look into the log file created, there is 40 000 + lines of nonsense. There is the 1 line i wanted, but the other 40 000 lines should not be there.

How do i have to configure the logback to make sure that the log file will only contain the 1 log invcation and nothing else?

 <appender name="AUDIT_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_PATH}/audit/audit.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
            <fileNamePattern>${LOG_PATH}/audit/audit.%i.log.gz</fileNamePattern>
            <minIndex>1</minIndex>
            <maxIndex>10</maxIndex>
        </rollingPolicy>
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>10MB</maxFileSize>
        </triggeringPolicy>
        <encoder>
            <charset>utf-8</charset>
            <Pattern>${FILE_LOG_PATTERN}</Pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>INFO</level>
        </filter>
</appender>

Answer 1

It sounds like you want the AUDIT_LOG to be reserved for one logger and only for that logger.

This instruction ...

<logger name="classname">
    <appender-ref ref="AUDIT_LOG"/>
</logger>

... directs log events from the classname logger to AUDIT_LOG but it does not prevent other log events from being handled by that appender.

If you want to ensure that the AUDIT_LOG appender only handles events for a specific logger then you can use a EvaluatorFilter .

Here's an example using the Logback's JaninoEventEvaluator :

<appender name="AUDIT_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <!-- this filter will accept all log events having the logger name "classname" -->
    <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
        <evaluator>
            <expression>return logger.equals("classname");</expression>
        </evaluator>
        <OnMismatch>DENY</OnMismatch>
        <OnMatch>NEUTRAL</OnMatch>
    </filter>

    <file>${LOG_PATH}/audit/audit.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
        <fileNamePattern>${LOG_PATH}/audit/audit.%i.log.gz</fileNamePattern>
        <minIndex>1</minIndex>
        <maxIndex>10</maxIndex>
    </rollingPolicy>
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
        <maxFileSize>10MB</maxFileSize>
    </triggeringPolicy>
    <encoder>
        <charset>utf-8</charset>
        <Pattern>${FILE_LOG_PATTERN}</Pattern>
    </encoder>
</appender>

Note: the evaluator expression is an ...

arbitrary Java language block returning a boolean value as the evaluation criteria