RollingFileAppender

http://logback.qos.ch/manual/appenders.html#RollingFileAppender

1.基于时间的滚动策略

TimeBasedRollingPolicy

就好比一个小车，推着走。车身所压的时间就是要保留日志的时间。

<configuration>

    <appender name="FILE"

        class="ch.qos.logback.core.rolling.RollingFileAppender">

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

            <!-- daily rollover -->

            <fileNamePattern>${catalina.base}/logs/${CONTEXT_NAME}/%d{yyyy-MM-dd}/logFile.%d{yyyy-MM-dd}.log

            </fileNamePattern>

            <!-- keep 30 days' worth of history -->

            <maxHistory>30</maxHistory>

        </rollingPolicy>

        <encoder>

            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n

            </pattern>

        </encoder>

    </appender>

    <root level="DEBUG">

        <appender-ref ref="FILE" />

    </root>

</configuration>

2.基于大小和时间的文件命名和触发策略

http://logback.qos.ch/manual/appenders.html#SizeAndTimeBasedFNATP

FNATP means File Naming And Triggering Policy

达到最大值便压缩；可根据每天时间变化生成文件夹。

可以设置两个rolling ：INFO 和 ERROR .

<configuration>

  <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">

    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

      <!-- rollover daily -->

      <fileNamePattern>${catalina.base}/logs/${CONTEXT_NAME}/%d{yyyy-MM-dd}/mylog-%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>

      <timeBasedFileNamingAndTriggeringPolicy

            class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

        <!-- or whenever the file size reaches 100MB -->

        <maxFileSize>1mb</maxFileSize>

      </timeBasedFileNamingAndTriggeringPolicy>

    </rollingPolicy>

    <encoder>

      <pattern>%msg%n</pattern>

    </encoder>

  </appender>

  <root level="DEBUG">

    <appender-ref ref="ROLLING" />

  </root>

</configuration>

由以下代码可知，不加单位为byte, 单位只能加kb、mb、gb ，不区分大小写。

 if (unitStr.equalsIgnoreCase("")) {

        coefficient = 1;

      } else if (unitStr.equalsIgnoreCase("kb")) {

        coefficient = KB_COEFFICIENT;

      } else if (unitStr.equalsIgnoreCase("mb")) {

        coefficient = MB_COEFFICIENT;

      } else if (unitStr.equalsIgnoreCase("gb")) {

        coefficient = GB_COEFFICIENT;

      } else {

        throw new IllegalStateException("Unexpected " + unitStr);

      }

      return new FileSize(lenValue * coefficient);

注：1、 2 策略不能混用，因为不能同时生效

-------------------- 20190606 补充 -----------

     <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">

        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">

            <!-- daily rollover -->

            <fileNamePattern>D://data/fix.%d{yyyy-MM-dd-HH-mm}.%i.log.gz

            </fileNamePattern>

            <!-- 保留30（时间单位） -->

            <maxHistory>30</maxHistory>

            <!-- 单个文件最大 -->

            <maxFileSize>20MB</maxFileSize>

            <!-- 压缩后的fix文件总量，必须大于maxFileSize -->

            <totalSizeCap>20MB</totalSizeCap>

        </rollingPolicy>

        <encoder>

            <pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread]%-5level%logger{50} - %msg%n</pattern>

        </encoder>

    </appender>

https://logback.qos.ch/manual/appenders.html

    /**

     * Given the FileNamePattern string, this method determines the compression

     * mode depending on last letters of the fileNamePatternStr. Patterns ending

     * with .gz imply GZIP compression, endings with '.zip' imply ZIP compression.

     * Otherwise and by default, there is no compression.

     *

     */

    protected void determineCompressionMode() {

        if (fileNamePatternStr.endsWith(".gz")) {

            addInfo("Will use gz compression");

            compressionMode = CompressionMode.GZ;

        } else if (fileNamePatternStr.endsWith(".zip")) {

            addInfo("Will use zip compression");

            compressionMode = CompressionMode.ZIP;

        } else {

            addInfo("No compression will be used");

            compressionMode = CompressionMode.NONE;

        }

    }

%d 按时间命名 i% 在之前基础上命名以gz结尾就是gzip压缩

巴特西

RollingFileAppender

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