按天生成日志

 <!--按天生成日志-->
    <appender name="logFile"  class="ch.qos.logback.core.rolling.RollingFileAppender">
          <Prudent>true</Prudent> 
          <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
               <FileNamePattern>
                    poslog/%d{yyyy-MM-dd}/%d{yyyy-MM-dd}.log
               </FileNamePattern>
          </rollingPolicy>
          <layout class="ch.qos.logback.classic.PatternLayout">
               <Pattern>
                %d{yyyy-MM-dd HH:mm:ss} -%msg%n    
               </Pattern>
          </layout>
    </appender>