Log4j.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
    <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"
    debug="false">
        <appender name="ERROR_FILE_APPENDER" class="org.apache.log4j.RollingFileAppender">
            <param name="Append" value="true" />
            <param name="Threshold" value="ERROR" />
            <param name="File" value="${bazas_admin_logdir}/bazas_admin_error.log" />
            <param name="MaxFileSize" value="5MB" />
            <param name="MaxBackupIndex" value="10" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%-c] %m%n" />
            </layout>
        </appender>
        <appender name="FILE" class="org.apache.log4j.RollingFileAppender">
            <param name="Append" value="true" />
            <param name="Threshold" value="WARN" />
            <param name="File" value="${bazas_admin_logdir}/bazas_admin.log" />
            <param name="MaxFileSize" value="20MB" />
            <param name="MaxBackupIndex" value="30" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%-c] %m%n" />
            </layout>
        </appender>
        <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
            <param name="Target" value="System.out" />
            <param name="Threshold" value="INFO" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c{1}] %m%n" />
            </layout>
        </appender>
        <category name="org.springframework">
            <priority value="ERROR" />
        </category>
        <category name="org.apache.velocity">
            <priority value="ERROR" />
        </category>
        <logger name="com.alibaba.bazas">
            <appender-ref ref="ERROR_FILE_APPENDER" />
            <appender-ref ref="EXCEPTION_LOG"/>
        </logger>
        <root>
            <level value="WARN" />
            <appender-ref ref="CONSOLE" />
            <appender-ref ref="FILE" />
            <appender-ref ref="EXCEPTION_LOG"/>
        </root>
    </log4j:configuration>

<root>标签对应log4j.properties中的rootLogger

<logger>是指继承自rootLogger的subLogger

<appender>中定义loglevel，append type, 文件大小

<logger>标签中定义此路径下统一使用的logging settings