Log4j2 日志按级别输出到不同文件
在生产环境中，可以按日志信息级别，输出到不同的文件中，如生成 info.log，warn.log，error.log 等；
这样的功能可以通过在 log42.xml 中配置Filter来实现；
一个示例的实现如下：
log4j2.xml
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<Configuration status="WARN" monitorInterval="500">
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<!--定义日志储存文件目录-->
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<properties>
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<property name="LOG_HOME">user/logs</property>
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</properties>
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<Appenders>
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<!--控制台输出所有日志-->
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<Console name="Console" target="SYSTEM_OUT">
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<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
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</Console>
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<!--Info级别日志输出-->
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<RollingRandomAccessFile name="InfoFile"
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fileName="${LOG_HOME}/info/info.log"
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filePattern="${LOG_HOME}/info-%d{yyyy-MM-dd}-%i.log">
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<Filters>
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<ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL" />
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<ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY" />
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</Filters>
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<PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
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<Policies>
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<TimeBasedTriggeringPolicy />
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<SizeBasedTriggeringPolicy size="10 MB" />
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</Policies>
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<DefaultRolloverStrategy max="20" />
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</RollingRandomAccessFile>
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<!--Error级别日志输出-->
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<RollingRandomAccessFile name="ErrorFile"
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fileName="${LOG_HOME}/error/error.log"
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filePattern="${LOG_HOME}/error-%d{yyyy-MM-dd}-%i.log">
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<Filters>
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<ThresholdFilter level="fatal" onMatch="DENY" onMismatch="NEUTRAL" />
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<ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY" />
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</Filters>
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<PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
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<Policies>
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<TimeBasedTriggeringPolicy />
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<SizeBasedTriggeringPolicy size="10 MB" />
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</Policies>
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<DefaultRolloverStrategy max="20" />
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</RollingRandomAccessFile>
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<!--Fatal级别日志输出-->
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<RollingRandomAccessFile name="FatalFile"
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fileName="${LOG_HOME}/fatal/fatal.log"
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filePattern="${LOG_HOME}/fatal-%d{yyyy-MM-dd}-%i.log">
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<Filters>
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<ThresholdFilter level="fatal" onMatch="ACCEPT" onMismatch="DENY" />
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</Filters>
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<PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
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<Policies>
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<TimeBasedTriggeringPolicy />
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<SizeBasedTriggeringPolicy size="10 MB" />
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</Policies>
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<DefaultRolloverStrategy max="20" />
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</RollingRandomAccessFile>
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</Appenders>
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<Loggers>
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<Root level="Debug">
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<AppenderRef ref="Console" />
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<AppenderRef ref="InfoFile" />
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<AppenderRef ref="ErrorFile" />
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<AppenderRef ref="FatalFile" />
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</Root>
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</Loggers>
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</Configuration>