Log4j2使用总结

Log4j 2 包含了基于LMAX 分离库的下一代的异步日志系统，在多线程环境下，异步日志系统比 Log4j 1.x 和Logback 提高了10倍性能提升（吞吐量和延迟率 ）。原文如下:

Log4j 2 contains next-generation Asynchronous Loggers based on the LMAX Disruptor library. In multi-threaded scenarios Asynchronous Loggers have 10 times higher throughput and orders of magnitude lower latency than Log4j 1.x and Logback. 

Log4j2目前已经出到了beta8版本，估计beta9在最近一周将放出，试用了下，感觉还不错，做如下总结!

我是从logback迁移到log4j2，

删除掉原有的包 log4j-over-slf4j-1.6.4.jar logback-classic-1.0.7.jar logback-core-1.0.7.jar slf4j-api-1.6.4.jar

增添以下的包 log4j-over-slf4j-1.7.5.jar log4j-api-2.0-beta8.jar log4j-core-2.0-beta8.jar  log4j-slf4j-impl-2.0-beta8.jar

由于作者推荐，为了性能考虑，尽量不要使用slf4j，但我依赖的第三方框架比如spring有对slf4j使用，所以对JAR包做了以上的取舍，所以原有代码中要做如下的改动

改动前:import org.slf4j.Logger;
      import org.slf4j.LoggerFactory;

     private static final Logger logger = LoggerFactory.getLogger(OOXX.class);

改动后:iimport org.apache.logging.log4j.LogManager;
      import org.apache.logging.log4j.Logger;

     private static final Logger logger = LogManager.getLogger(OOXX.class);

配置文件log4j2.xml如下:

<?xml version="1.0" encoding="UTF-8"?>
<!-- status=debug 可以查看log4j的装配过程 -->
<configuration status="off">
	<properties>
		<property name="LOG_HOME">/log/fish</property>
		<!-- 日志备份目录 -->
		<property name="BACKUP_HOME">{LOG_HOME}/backup</property>
		<property name="STAT_NAME">stat</property>
		<property name="SERVER_NAME">global</property>
	</properties>
	<appenders>
		<!-- 定义控制台输出 -->
		<Console name="Console" target="SYSTEM_OUT">
			<PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
		</Console>
		<!-- 程序员调试日志 -->
		<FastRollingFile name="DevLog" fileName="${LOG_HOME}/${SERVER_NAME}"
			filePattern="${LOG_HOME}/${SERVER_NAME}.%d{yyyy-MM-dd-HH}.log">
			<PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
			<Policies>
				<TimeBasedTriggeringPolicy interval="1" modulate="true" />
			</Policies>
		</FastRollingFile>
		<!-- 游戏产品数据分析日志 -->
		<FastRollingFile name="ProductLog"
			fileName="${LOG_HOME}/${SERVER_NAME}_${STAT_NAME}"
			filePattern="${LOG_HOME}/${SERVER_NAME}_${STAT_NAME}.%d{yyyy-MM-dd-HH}.log">
			<PatternLayout
				pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n" />
			<Policies>
				<TimeBasedTriggeringPolicy interval="1"
					modulate="true" />
			</Policies>
		</FastRollingFile>
	</appenders>
	<loggers>
		<!-- 3rdparty Loggers -->
		<logger name="org.springframework.core" level="info">
		</logger>
		<logger name="org.springframework.beans" level="info">
		</logger>
		<logger name="org.springframework.context" level="info">
		</logger>
		<logger name="org.springframework.web" level="info">
		</logger>
		<logger name="org.jboss.netty" level="warn">
		</logger>
		<logger name="org.apache.http" level="warn">
		</logger>
		<!-- Game Stat logger -->
		<logger name="com.u9.global.service.log" level="info"
			additivity="false">
			<appender-ref ref="ProductLog" />
		</logger>
		<!-- Root Logger -->
		<root level="DEBUG">
			<appender-ref ref="DevLog" />
			<appender-ref ref="Console" />
		</root>
	</loggers>
</configuration>

存在问题:在Eclipse下一切运行正常，如果把应用打包成jar包发布后，cmd命令行模式下，即使Console开着的情况下，也没法输出，文件输出也没有任何日志。