<?xml version="1.0" encoding="UTF-8"?><configuration>    <appender name="ACTIVITY"        class="ch.qos.logback.core.rolling.RollingFileAppender">        <file>log/activity.log</file>        <encoder charset="UTF-8">            <pattern>%date|%msg%n</pattern>        </encoder>        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">            <fileNamePattern>log/activity.log-%d{yyyy-MM-dd}</fileNamePattern>            <!-- 保留的天数/小时数 -->            <maxHistory>30</maxHistory>        </rollingPolicy>    </appender>    <appender name="SYS"        class="ch.qos.logback.core.rolling.RollingFileAppender">        <!-- 日志输出类型 -->        <file>log/sys.log</file>        <encoder charset="UTF-8">            <!-- 输出格式化 -->            <pattern>%date|%thread|%level|%F->%M|%msg%n</pattern>        </encoder>        <!-- 临界值过滤器，过滤掉级别更低的日志 -->        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">            <level>INFO</level>        </filter>        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">            <!-- 日志迁移方式(滚动策略) -->            <fileNamePattern>log/sys.log-%d{yyyy-MM-dd-HH}</fileNamePattern>        </rollingPolicy>    </appender>    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">        <encoder charset="UTF-8">            <pattern>%date|%thread|%level|%F->%M|%msg%n</pattern>        </encoder>        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">            <level>INFO</level>        </filter>    </appender>    <!-- additivity="false"表示不传递 -->    <logger name="ACTIVITY" level="DEBUG" additivity="false">        <appender-ref ref="ACTIVITY" />    </logger>    <!-- root是默认的logger,日志的输出先由logger的level控制，再由appender的filter控制 -->    <root level="DEBUG">        <!-- 默认日志采用两种输出方式 -->        <appender-ref ref="stdout" />        <appender-ref ref="SYS" />    </root></configuration>

package log_test;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class Test {        private static final Logger log = LoggerFactory.getLogger(Test.class);    private static Logger log2 = LoggerFactory.getLogger("ACTIVITY");        public static void main(String[] args) {                log.info(System.currentTimeMillis()+"");        log.error(System.currentTimeMillis()+"");        log.debug(System.currentTimeMillis()+"");                log2.info(System.currentTimeMillis()+" ACTIVITY");        log2.error(System.currentTimeMillis()+" ACTIVITY");        log2.debug(System.currentTimeMillis()+" ACTIVITY");            }}