logback指定时间执行压缩

要使用logback实现定时压缩日志文件，可以使用logback的`TimeBasedRollingPolicy`和`SizeAndTimeBasedFNATP`。具体步骤如下：

1. 在logback.xml中配置`TimeBasedRollingPolicy`和`SizeAndTimeBasedFNATP`，如下所示：

<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
  <file>logs/mylog.log</file>
  <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    <fileNamePattern>logs/mylog-%d{yyyy-MM-dd}.log.gz</fileNamePattern>
    <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
      <maxFileSize>1MB</maxFileSize>
    </timeBasedFileNamingAndTriggeringPolicy>
    <maxHistory>30</maxHistory>
  </rollingPolicy>
  <encoder>
    <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern>
  </encoder>
</appender>

2. 在logback.xml中配置定时任务，使用`ch.qos.logback.core.util.FileSize`来判断文件大小，如下所示：

<configuration>
  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <!-- appender配置... -->
  </appender>

  <scheduledThreadPool>
    <scheduledExecutorService class="java.util.concurrent.Executors"
                               name="scheduled-thread-pool"/>
  </scheduledThreadPool>

  <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
    <maxFileSize>1MB</maxFileSize>
    <timeBasedRollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <fileNamePattern>logs/mylog-%d{yyyy-MM-dd}.log.gz</fileNamePattern>
      <maxHistory>30</maxHistory>
    </timeBasedRollingPolicy>
    <scheduledFilename>logs/mylog-%d{yyyy-MM-dd}.log.gz</scheduledFilename>
    <cleanHistoryOnStart>true</cleanHistoryOnStart>
    <timeBasedArchiveRemover class="ch.qos.logback.core.rolling.helper.DefaultArchiveRemover">
      <maxHistory>30</maxHistory>
    </timeBasedArchiveRemover>
    <scheduledFuture>
      <scheduledFuture>
        <cronExpression>0 0 0 * * ? *</cronExpression>
        <fileNamePattern>logs/mylog-%d{yyyy-MM-dd}.log.gz</fileNamePattern>
        <scheduledExecutorService class="java.util.concurrent.Executors"
                                   name="scheduled-thread-pool"/>
        <fileSize>${FileSize.valueOf("1MB")}</fileSize>
      </scheduledFuture>
    </scheduledFuture>
  </timeBasedFileNamingAndTriggeringPolicy>

  <root level="INFO">
    <appender-ref ref="FILE" />
  </root>
</configuration>

上述配置中，`<cronExpression>0 0 0 * * ? *</cronExpression>`指定了每天0点执行一次定时任务，`${FileSize.valueOf("1MB")}`指定了文件大小，当日志文件大小达到1MB时，就会触发日志文件的压缩。