詳解log4j2(下) - Async/MongoDB/Flume Appender 按記錄層級區分檔案輸出

1. 按記錄層級區分檔案輸出

有些人習慣按日誌資訊層級輸出到不同名稱的檔案中，如info.log，error.log，warn.log等，在log4j2中可通過配置Filters來實現。

假定需求是把INFO及以下層級的資訊輸出到info.log，WARN和ERROR層級的資訊輸出到error.log，FATAL層級輸出到fatal.log，設定檔如下：

[java]  view plain  copy  print ? <Configuration status="WARN" monitorInterval="300">       <properties>           <property name="LOG_HOME">D:/logs</property>       </properties>       <Appenders>           <Console name="Console" target="SYSTEM_OUT">               <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />           </Console>              <RollingRandomAccessFile name="InfoFile"               fileName="${LOG_HOME}/info.log"               filePattern="${LOG_HOME}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log">               <Filters>                   <ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL" />                   <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY" />               </Filters>               <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />               <Policies>                   <TimeBasedTriggeringPolicy />                   <SizeBasedTriggeringPolicy size="10 MB" />               </Policies>               <DefaultRolloverStrategy max="20" />           </RollingRandomAccessFile>                      <RollingRandomAccessFile name="ErrorFile"               fileName="${LOG_HOME}/error.log"               filePattern="${LOG_HOME}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log">               <Filters>                   <ThresholdFilter level="fatal" onMatch="DENY" onMismatch="NEUTRAL" />                   <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY" />               </Filters>               <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />               <Policies>                   <TimeBasedTriggeringPolicy />                   <SizeBasedTriggeringPolicy size="10 MB" />               </Policies>               <DefaultRolloverStrategy max="20" />           </RollingRandomAccessFile>                      <RollingRandomAccessFile name="FatalFile"               fileName="${LOG_HOME}/fatal.log"               filePattern="${LOG_HOME}/$${date:yyyy-MM}/fatal-%d{yyyy-MM-dd}-%i.log">               <Filters>                   <ThresholdFilter level="fatal" onMatch="ACCEPT" onMismatch="DENY" />