log4j 分级别写入不同的日志文件

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

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>

<appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">

<layout class="org.apache.log4j.PatternLayout">

<param name="ConversionPattern" value="%c %d{ISO8601} -- %p -- %m%n" />

</layout>

</appender>

<appender name="DEBUG"

class="org.apache.log4j.RollingFileAppender">

<param name="File" value="C:\\logs\\app-debug.log" />

<param name="Append" value="true" />

<param name="MaxFileSize" value="500KB" />

<param name="MaxBackupIndex" value="2" />

<layout class="org.apache.log4j.PatternLayout">

<param name="ConversionPattern" value="%c %d{ISO8601} -- %p -- %m%n" />

</layout>

<!-- filter作用？ 配置LevelMax与LevelMin限定输出到文件的日志级别 -->

<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="C:\\logs\\app-info.log" />

<param name="Append" value="true" />

<param name="MaxFileSize" value="500KB" />

<param name="MaxBackupIndex" value="2" />

<layout class="org.apache.log4j.PatternLayout">

<param name="ConversionPattern" value="%c %d{ISO8601} -- %p -- %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="C:\\logs\\app-warn.log" />

<param name="Append" value="true" />

<param name="MaxFileSize" value="500KB" />

<param name="MaxBackupIndex" value="2" />

<layout class="org.apache.log4j.PatternLayout">

<param name="ConversionPattern" value="%c %d{ISO8601} -- %p -- %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="C:\\logs\\app-error.log" />

<param name="Append" value="true" />

<param name="MaxFileSize" value="500KB" />

<param name="MaxBackupIndex" value="2" />

<layout class="org.apache.log4j.PatternLayout">

<param name="ConversionPattern" value="%c %d{ISO8601} -- %p -- %m%n" />

</layout>

<filter class="org.apache.log4j.varia.LevelRangeFilter">

<param name="LevelMin" value="ERROR" />

<param name="LevelMax" value="ERROR" />

</filter>

</appender>

<root>

<priority value="debug" />

<appender-ref ref="STDOUT" />

<appender-ref ref="DEBUG" />

<appender-ref ref="INFO" />

<appender-ref ref="WARN" />

<appender-ref ref="ERROR" />

</root>

</log4j:configuration>

class

import org.apache.log4j.Logger;

public class TestLog4j

{

private static final Logger log = Logger.getLogger(TestLog4j.class);

public static void main(String[] args)

{

log.debug("debug...");

log.info("info...");

log.warn("warn...");

log.error("error...");

}

}