【logback】使用时几个注意点

实际使用的logback.xml 配置文件如下

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

    <appender name="ROOT-APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>/Users/hao/logs/error.log</file>
        <append>true</append>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>/Users/hao/logs/error.log.%d{yyyy-MM-dd}</FileNamePattern>
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d %p [%t] %c{20} %X{traceId:--} %m%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
        <!-- 过滤掉低于WARN级别的日志 -->
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARN</level>
        </filter>
    </appender>

    <appender name="INFO-APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>/Users/hao/logs/info.log</file>
        <append>true</append>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>/Users/hao/logs/info.log.%d{yyyy-MM-dd}</FileNamePattern>
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d %p [%t] %c{20} %X{traceId:--} %m%n</pattern>
            <charset class="java.nio.charset.Charset">UTF-8</charset>
        </encoder>
    </appender>

    <!-- 指定工程目录下的log级别,且要求其输出到rootLogger的appender中 -->
    <logger name="com.vdian.emanage" level="INFO" additivity="true">
        <appender-ref ref="INFO-APPENDER"/>
    </logger>

    <root level="WARN">
        <appender-ref ref="ROOT-APPENDER"/>
    </root>

</configuration>

注意点:
1  appender中filter。参考 http://blog.csdn.net/haidage/article/details/6794540
2 additivity的作用在于 children-logger是否使用 rootLogger配置的appender进行输出