log4net

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>

<log4net>
<!--信息日志-->
<!--控制级别，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->
<appender name="infoLog" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="logs/info.log" />
<param name="AppendToFile" value="true" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="yyyyMMdd" />
<param name="StaticLogFileName" value="true" />
<param name="MaxSizeRollBackups" value="90" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d %-5p %c - %m%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="INFO" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>

<!--错误日志-->
<appender name="errorLog" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="logs/error.log" />
<param name="AppendToFile" value="true" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="yyyyMMdd" />
<param name="StaticLogFileName" value="true" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d %-5p %c - %m%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="WARN" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>

<!--控制台-->
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%d %-5p %c - %m%n"/>
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="INFO" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>

<root>
<level value="ALL" />
<appender-ref ref="infoLog"/>
<appender-ref ref="errorLog" />
<appender-ref ref="ConsoleAppender"/>
</root>
</log4net>
</configuration>

另外一种限制日志大小的

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net debug="false">
<appender name="errorLog" type="log4net.Appender.RollingFileAppender">
<file value="log/error.log" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<datePattern value=".yyyyMMdd" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="1MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level %logger -%m%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="ERROR" />
<levelMax value="FATAL" />
</filter>
</appender>
<appender name="infoLog" type="log4net.Appender.RollingFileAppender">
<file value="log/info.log" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<datePattern value=".yyyyMMdd" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="1MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level %logger -%m%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="INFO" />
</filter>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="infoLog"/>
<appender-ref ref="errorLog" />
</root>
</log4net>
</configuration>