log4j2配置文件配置详解

<? xml  version = "1.0"  encoding = "UTF-8" ?>
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--Configuration后面的status，这个用于设置log4j2自身内部的信息输出，可以不设置，当设置成trace时，你会看到log4j2内部各种详细输出-->
<!--monitorInterval：Log4j能够自动检测修改配置 文件和重新配置本身，设置间隔秒数-->
< configuration  status = "WARN"  monitorInterval = "30" >
     <!--先定义所有的appender-->
     < appenders >
         <!--这个输出控制台的配置-->
         < console  name = "Console"  target = "SYSTEM_OUT" >
         <!--输出日志的格式-->
             < PatternLayout  pattern = "[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
         </ console >
         <!--文件会打印出所有信息，这个log每次运行程序会自动清空，由append属性决定，这个也挺有用的，适合临时测试用-->
         < File  name = "log"  fileName = "log/"  append = "false" >
             < PatternLayout  pattern = "%d{HH:mm:} %-5level %class{36} %L %M - %msg%xEx%n" />
         </ File >
         <!-- 这个会打印出所有的info及以下级别的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
         < RollingFile  name = "RollingFileInfo"  fileName = "${sys:}/logs/"
                      filePattern = "${sys:}/logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%" >
             <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
             < ThresholdFilter  level = "info"  onMatch = "ACCEPT"  onMismatch = "DENY" />
             < PatternLayout  pattern = "[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
             < Policies >
                 < TimeBasedTriggeringPolicy />
                 < SizeBasedTriggeringPolicy  size = "100 MB" />
             </ Policies >
         </ RollingFile >
         < RollingFile  name = "RollingFileWarn"  fileName = "${sys:}/logs/"
                      filePattern = "${sys:}/logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%" >
             < ThresholdFilter  level = "warn"  onMatch = "ACCEPT"  onMismatch = "DENY" />
             < PatternLayout  pattern = "[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
             < Policies >
                 < TimeBasedTriggeringPolicy />
                 < SizeBasedTriggeringPolicy  size = "100 MB" />
             </ Policies >
             <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 -->
             < DefaultRolloverStrategy  max = "20" />
         </ RollingFile >
         < RollingFile  name = "RollingFileError"  fileName = "${sys:}/logs/"
                      filePattern = "${sys:}/logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%" >
             < ThresholdFilter  level = "error"  onMatch = "ACCEPT"  onMismatch = "DENY" />
             < PatternLayout  pattern = "[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n" />
             < Policies >
                 < TimeBasedTriggeringPolicy />
                 < SizeBasedTriggeringPolicy  size = "100 MB" />
             </ Policies >
         </ RollingFile >
     </ appenders >
     <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效-->
     < loggers >
         <!--过滤掉spring和mybatis的一些无用的DEBUG信息-->
         < logger  name = ""  level = "INFO" ></ logger >
         < logger  name = ""  level = "INFO" ></ logger >
         < root  level = "all" >
             < appender-ref  ref = "Console" />
             < appender-ref  ref = "RollingFileInfo" />
             < appender-ref  ref = "RollingFileWarn" />
             < appender-ref  ref = "RollingFileError" />
         </ root >
     </ loggers >
 </ configuration >