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对于以下 logback.xml，不会创建日志文件 foo.log。

    <appender name="example" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${user.home}/log/main.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>50</maxHistory>
            <totalSizeCap>300MB</totalSizeCap>
        </rollingPolicy>

        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>


    <appender name="example.foo" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${user.home}/log/foo.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>50</maxHistory>
            <totalSizeCap>300MB</totalSizeCap>
        </rollingPolicy>

        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <logger name="example" level="DEBUG" additivity="false">
        <appender-ref ref="example"/>
        <appender-ref ref="console"/>
    </logger>


    <logger name="example.foo" level="DEBUG" additivity="false">
        <appender-ref ref="example.foo"/>
        <appender-ref ref="console"/>
    </logger>

    <root level="DEBUG">
        <appender-ref ref="example"/>
        <appender-ref ref="console"/>
    </root>

</configuration>

爪哇代码：

Logger logger = LoggerFactory.getLogger("example.foo");
logger.debug("hello foo");

日志消息显示在控制台上，但未创建日志文件 foo.log。

Logger logger = LoggerFactory.getLogger("example");
logger.debug("hello example");

此消息显示在控制台和日志文件 main.log 上。

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