logback只输出WARN级别的日志

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <!--<Pattern>${ENCODER_PATTERN}</Pattern>-->
        <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %X{QTRACER} %X{MDCContextId}-%X{MDCSupplyService}-%X{MDCSupplyRetryTime} %-5level %logger{0} - %msg%n</pattern>
    </encoder>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
        <level>warn</level>
        <onMatch>ACCEPT</onMatch>
　　　　 <onMismatch>DENY</onMismatch>
    </filter>
</appender>