log4j常用知识点记录

1.常用Appender

2.常用Layout

3.PatternLayout常用配置属性

4.examples

4.1 log4j.properties文件

log4j.rootLogger=debug,appender1,appender2


log4j.appender.appender1=org.apache.log4j.ConsoleAppender
log4j.appender.appender1.layout=org.apache.log4j.PatternLayout
log4j.appender.appender1.layout.ConversionPattern=%d [%-5p] [%t] %-17c{2} (%13F:%L)-%m%n


log4j.appender.appender2=org.apache.log4j.FileAppender
log4j.appender.appender2.File=C://demonlog4j.log
log4j.appender.appender2.layout=org.apache.log4j.PatternLayout
log4j.appender.appender2.layout.ConversionPattern=%d [%-5p] [%t] %-17c{2} (%13F:%L)-%m%n

4.2 log4j.xml

<?xml version="1.0" encoding="GB2312" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<!--#log4j中有5级logger ,#FATAL 0 ,#ERROR 3 ,#WARN 4 ,#INFO 6 ,#DEBUG 7 -->
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
    <appender name="LOG.Console"
              class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
    </appender>


    <appender name="LOG.DEBUG"
              class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="logs/radarnet_debug.log" />
        <param name="Append" value="true" />
        <param name="MaxFileSize" value="10MB" />
        <param name="MaxBackupIndex" value="10" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="DEBUG" />
            <param name="LevelMax" value="DEBUG" />
        </filter>
    </appender>


    <appender name="LOG.INFO"
              class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="logs/radarnet_info.log" />
        <param name="MaxFileSize" value="10MB" />
        <param name="MaxBackupIndex" value="10" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="INFO" />
            <param name="LevelMax" value="INFO" />
        </filter>
    </appender>


    <appender name="LOG.WARN"
              class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="logs/radarnet_warn.log" />
        <param name="MaxFileSize" value="10MB" />
        <param name="MaxBackupIndex" value="10" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="WARN" />
            <param name="LevelMax" value="WARN" />
        </filter>
    </appender>


    <appender name="LOG.ERROR"
              class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="logs/radarnet_error.log" />
        <param name="MaxFileSize" value="10MB" />
        <param name="MaxBackupIndex" value="10" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="ERROR" />
            <param name="LevelMax" value="ERROR" />
        </filter>
    </appender>


    <appender name="LOG.FATAL"
              class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="logs/radarnet_fatal.log" />
        <param name="MaxFileSize" value="10MB" />
        <param name="MaxBackupIndex" value="10" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="FATAL" />
            <param name="LevelMax" value="FATAL" />
        </filter>
    </appender>
    <logger name="com.google.code" additivity="false">
        <level value="DEBUG" />
    </logger>
    <logger name="org.apache.activemq.ActiveMQMessageConsumer" additivity="false">
        <level value="DEBUG" />
    </logger>
    <logger name="com.suncreate.system.db.connection" additivity="false">
        <level value="INFO" />
    </logger>
    <logger name="org.apache.activemq.transport.AbstractInactivityMonitor" additivity="false">
        <level value="DEBUG" />
    </logger>
    <logger name="net.rubyeye.xmemcached" additivity="false">
        <level value="DEBUG" />
    </logger>
    <logger name="httpclient.wire" additivity="false">
        <level value="DEBUG" />
    </logger>
    <logger name="org.apache.commons.httpclient" additivity="false">
        <level value="DEBUG" />
    </logger>
    <root>
        <priority value="DEBUG" />
        <appender-ref ref="LOG.Console" />
        <appender-ref ref="LOG.DEBUG" />
        <appender-ref ref="LOG.INFO" />
        <appender-ref ref="LOG.WARN" />
        <appender-ref ref="LOG.ERROR" />
        <appender-ref ref="LOG.FATAL" />
    </root>
</log4j:configuration>