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log4j配置分为两种：xml文件和properties

首先附上log4j.properties

log4j.rootLogger=error,stdout,D,R,S,T   //目前的日志级别为error，可以根据实际情况调整

### stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{HH:mm:ss,SSS} [%-4p] %m (%F:%L)%n #file log4j.appender.D=org.apache.log4j.RollingFileAppender log4j.appender.D.File=log/debug.log log4j.appender.D.MaxFileSize=102400KB log4j.appender.D.MaxBackupIndex=10 log4j.appender.D.Threshold=debug log4j.appender.D.layout=org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern=%d %-5p (%F:%L) - %m%n log4j.appender.D.BufferedIO=true log4j.appender.D.BufferSize=8192

log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.File=log/info.log log4j.appender.R.MaxFileSize=102400KB log4j.appender.R.MaxBackupIndex=10 log4j.appender.R.Threshold=info log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%d %-5p (%F:%L) - %m%n log4j.appender.R.BufferedIO=true log4j.appender.R.BufferSize=8192

log4j.appender.S=org.apache.log4j.RollingFileAppender

log4j.appender.S.File=log/warn.log log4j.appender.S.MaxFileSize=102400KB log4j.appender.S.MaxBackupIndex=10 log4j.appender.S.Threshold=warn log4j.appender.S.layout=org.apache.log4j.PatternLayout log4j.appender.S.layout.ConversionPattern=%d %-5p (%F:%L) - %m%n log4j.appender.S.BufferedIO=true log4j.appender.S.BufferSize=8192

log4j.appender.T=org.apache.log4j.RollingFileAppender

log4j.appender.T.File=log/error.log log4j.appender.T.MaxFileSize=102400KB log4j.appender.T.MaxBackupIndex=10 log4j.appender.T.Threshold=error log4j.appender.T.layout=org.apache.log4j.PatternLayout log4j.appender.T.layout.ConversionPattern=%d %-5p (%F:%L) - %m%n log4j.appender.T.BufferedIO=true log4j.appender.T.BufferSize=8192

在java中如果要重新加载修改之后的配置文件：

 

 

附上log4j.xml，目前有一个问题，我想在配置中使用变量，但是还没有查到如何使用，比如我想把日志级别定义成变量，到时候只用改一处就可以了！

<?xml version="1.0" encoding="UTF-8" ?>  

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">    <log4j:configuration xmlns:log4j="">           <!-- <Properties>          <Property name="level">info</Property>      </Properties> -->         <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss:SSS} -(%F:%L) %5p - %m%n"/>           </layout>       </appender>         <appender name="DEBUG" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/debug.log"/>           <param name="Append" value="true"/>           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="10"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss:SSS} -(%F:%L) %5p - %m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="DEBUG" />               <param name="LevelMax" value="DEBUG" />           </filter>       </appender>         <appender name="INFO" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/info.log"/>           <param name="Append" value="true" />           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="10"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss:SSS} -(%F:%L) %5p - %m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="INFO" />               <param name="LevelMax" value="INFO" />           </filter>       </appender>         <appender name="WARN" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/warn.log"/>           <param name="Append" value="true"/>           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="10"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss:SSS} -(%F:%L) %5p - %m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="WARN" />               <param name="LevelMax" value="WARN" />           </filter>       </appender>         <appender name="ERROR" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/error.log"/>           <param name="Append" value="true"/>           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="10"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss:SSS} -(%F:%L) %5p - %m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="ERROR" />               <param name="LevelMax" value="ERROR" />           </filter>       </appender>          <appender name="gps" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/device_statushis.log"/>           <param name="Append" value="true"/>           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="5"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="FATAL" />               <param name="LevelMax" value="FATAL" />           </filter>       </appender>      <appender name="gpshide" class="org.apache.log4j.RollingFileAppender">           <param name="File" value="./log/device_statushis_invisible.log"/>           <param name="Append" value="true"/>           <param name="MaxFileSize" value="10240KB"/>           <param name="MaxBackupIndex" value="5"/>           <layout class="org.apache.log4j.PatternLayout">               <param name="ConversionPattern" value="%m%n"/>           </layout>           <filter class="org.apache.log4j.varia.LevelRangeFilter">               <param name="LevelMin" value="FATAL" />               <param name="LevelMax" value="FATAL" />           </filter>       </appender>         

  <!--这样可以把特殊的日志打印到另外的文件中 -->

    <logger name="com.sanshi.mysql.GpsDao" additivity="true">                <level value="info" />           <appender-ref ref="gps"/>            </logger>     <logger name="com.sanshi.mysql.GpshideDao" additivity="true">                <level value="info" />           <appender-ref ref="gpshide"/>            </logger>          <!--   <category name="com.dina.dse.handler.GPSHandler">        <priority value="FATAL"/>        <appender-ref ref="gps"/>     </category> -->        <root>           <priority value="info" />           <appender-ref ref="STDOUT"/>           <appender-ref ref="DEBUG"/>           <appender-ref ref="INFO"/>           <appender-ref ref="WARN"/>           <appender-ref ref="ERROR"/>       </root>   </log4j:configuration> 

java中重新加载：

    DOMConfigurator.configure(LOG4J_PATH); //重新加载对应的路径

 

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