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"><PatternLayoutpattern="%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>