<!-- 文件输出 -->
<appender name="FILECOUT" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/${log.name}</file>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>${log.path}/${log.name}.%i</fileNamePattern>
<!-- 索引最小值，标识%i从1开始 -->
<minIndex>1</minIndex>
<!-- 索引最大值，标识%i到5结束，始终保留了5个归档文件 -->
<maxIndex>5</maxIndex>
</rollingPolicy>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<!-- 文件大小超过1MB归档 -->
<maxFileSize>1MB</maxFileSize>
</triggeringPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{80} [%file:%line] %msg %n</pattern>
</encoder>
</appender>
Logback配置三(按文件大小归档)
原文：http://blog.51cto.com/limeixiong/2051091
