Log4j2的配置

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log4j 2.0使用非常简单，只要用LogManager的getLogger函数获取一个logger，就可以使用logger记录日志，以下是log4j2的配置：

<?xml version="1.0" encoding="UTF-8"?><Configuration>    <Appenders>        <Console name="Console" target="SYSTEM_OUT">            <PatternLayout pattern="[%p %d{yyyy-MM-dd HH:mm:ss z}] %c{1}.%M(%L) | %m%n"/>                    </Console>        <RollingFile name="RollingFile" fileName="logs/HomePlatform.log" filePattern="log/$${date:yyyy-MM}/HomePlatform-%d{MM-dd-yyyy}-%i.log.gz"><PatternLayout pattern="[%d{yyyy-MM-dd  HH:mm:ss} %-5level] %class{36} %L %M - %msg%xEx%n"/><SizeBasedTriggeringPolicy size="50MB"/></RollingFile>    </Appenders>    <Loggers>        <Logger name="net.sf.ehcache" level="error"/>        <!-- Suppress success logging from InteractiveAuthenticationSuccessEvent -->        <Logger name="org.springframework.security" level="error"/>        <Logger name="org.apache" level="error"/>        <Logger name="org.apache.velocity" level="fatal"/>        <!-- Suppress invalid warning messages from JSF -->        <Logger name="org.apache.myfaces" level="error"/>        <!-- Suppress warnings from Struts -->        <Logger name="org.apache.struts2.util.TextProviderHelper" level="error"/>        <Logger name="com.opensymphony.xwork2.util.OgnlUtil" level="error"/>        <Logger name="com.opensymphony.xwork2.ognl.OgnlValueStack" level="error"/>        <Logger name="org.dbunit" level="warn"/>        <Logger name="org.hibernate" level="warn"/>        <!-- Uncomment if you want to see Hibernate's SQL -->        <!--<Logger name="org.hibernate.SQL" level="debug"/>-->        <Logger name="org.springframework" level="warn"/>        <Root level="warn">        <AppenderRef ref="RollingFile" />            <AppenderRef ref="Console" />        </Root>    </Loggers></Configuration>

系统选择configuration文件的优先级如下：

classpath下名为 log4j-test.json 或者log4j-test.jsn文件
classpath下名为 log4j2-test.xml
classpath下名为 log4j.json 或者log4j.jsn文件
classpath下名为 log4j2.xml

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