Apache Log4j2 package specific logging using log4j2.xml

问题

I am using log4j2. But the problem that I am facing is that it logs all logs. I want to ... log from specific package to a specific file & other package to another file. I am using log4j2.xml for configuration. Please can someone help?

log4j2.xml

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

<Loggers>
    <Root level="DEBUG" additivity="false">
        <AppenderRef level="DEBUG" ref="CONSOLE" />
        <AppenderRef level="DEBUG" ref="fileAppender" />
    </Root>
    <Logger name="com.pkg.test.logging.method" level="DEBUG"
        additivity="false">
        <Appender-ref ref="fileAppender" level="DEBUG" />
    </Logger>

</Loggers>

<Appenders>

    <Console name="CONSOLE" target="SYSTEM_OUT">
        <PatternLayout
            pattern="%highlight{[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1}: %L - %msg%n%throwable}" />
    </Console>

    <RollingFile name="fileAppender" fileName="./log.log"
        filePattern="./log-%d{yyyy-MM-dd}.log">
        <PatternLayout
            pattern="%highlight{[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1}: %L - %msg%n}" />
        <Policies>
            <TimeBasedTriggeringPolicy interval="1"
                modulate="true" />
        </Policies>
    </RollingFile>
</Appenders>

回答1:

Just answered the question.

log4j2.xml

    <?xml version="1.0" encoding="UTF-8"?>
<Loggers>
    <Root level="DEBUG" additivity="false">
        <AppenderRef level="DEBUG" ref="CONSOLE" />
     </Root>
    <Logger name="com.pkg.test.logging.method" level="DEBUG"
        additivity="false">
        <Appender-ref ref="fileAppender" level="DEBUG" />
    </Logger>

</Loggers>

<Appenders>

    <Console name="CONSOLE" target="SYSTEM_OUT">
        <PatternLayout
            pattern="%highlight{[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1}: %L - %msg%n%throwable}" />
    </Console>

    <RollingFile name="fileAppender" fileName="./log.log"
        filePattern="./log-%d{yyyy-MM-dd}.log">
        <PatternLayout
            pattern="%highlight{[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1}: %L - %msg%n}" />
        <Policies>
            <TimeBasedTriggeringPolicy interval="1"
                modulate="true" />
        </Policies>
    </RollingFile>
</Appenders>

Removed the <AppenderRef level="DEBUG" ref="fileAppender" /> from root logger. Thus it started logging logs based on packages.

回答2:

From Log4J Manual:

Adding a specific logger for a class: (you can refer to packages here too)

<Logger name="org.apache.logging.log4j.test2" level="debug" additivity="false">
  <AppenderRef ref="File"/>
</Logger>

Adding a specific appender:

<Appender type="File" name="File" fileName="${filename}">
  <Layout type="PatternLayout">
    <Pattern>%d %p %C{1.} [%t] %m%n</Pattern>
  </Layout>
</Appender>

来源：https://stackoverflow.com/questions/38713575/apache-log4j2-package-specific-logging-using-log4j2-xml

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