log4j入门

日志是应用软件中不可缺少的部分，Apache的开源项目log4j是一个功能强大的日志组件,提供方便的日志记录。在apache网站：jakarta.apache.org/log4j 可以免费下载到Log4j最新版本的软件包。

详见他人博客：

http://www.codeceo.com/article/log4j-usage.html,

http://www.cnblogs.com/alipayhutu/archive/2012/06/21/2558249.html

自定义appender：

http://www.cnblogs.com/LinkinPark/p/5232837.html，

http://blog.csdn.net/wlbing0625/article/details/7888092

项目中一个log4j配置文件，存起来以后看

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!
# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

log4j.appender.masfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.masfile.DatePattern='_'yyyy-MM-dd
log4j.appender.masfile.File=${travel.root}/WEB-INF/logs/mas/mas.log
# Pattern to output: date priority [category] - message
log4j.appender.masfile.layout=org.apache.log4j.PatternLayout
log4j.appender.masfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

log4j.appender.solidfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.solidfile.DatePattern='_'yyyy-MM-dd
log4j.appender.solidfile.File=${travel.root}/WEB-INF/logs/solid/solid.log
# Pattern to output: date priority [category] - message
log4j.appender.solidfile.layout=org.apache.log4j.PatternLayout
log4j.appender.solidfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

log4j.appender.sqlfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.sqlfile.DatePattern='_'yyyy-MM-dd
log4j.appender.sqlfile.File=${travel.root}/WEB-INF/logs/sql/sql.log
# Pattern to output: date priority [category] - message
log4j.appender.sqlfile.layout=org.apache.log4j.PatternLayout
log4j.appender.sqlfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=${travel.root}/WEB-INF/logs/message.log
log4j.appender.logfile.MaxFileSize=4096KB
# Keep three backup files.
log4j.appender.logfile.MaxBackupIndex=
# Pattern to output: date priority [category] - message
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

log4j.appender.debugfile=org.apache.log4j.RollingFileAppender
log4j.appender.debugfile.File=${travel.root}/WEB-INF/logs/debug/debug.log
log4j.appender.debugfile.MaxFileSize=4096KB
# Keep three backup files.
log4j.appender.debugfile.MaxBackupIndex=
# Pattern to output: date priority [category] - message
log4j.appender.debugfile.layout=org.apache.log4j.PatternLayout
log4j.appender.debugfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p [%c] - %m%n

#info, debug, logfile
log4j.rootCategory=info, stdout, logfile
#log4j.logger.org.springframework.data.redis=debug, stdout, logfile
#log4j.logger.com.scenic.queue.runnable.DataMigrationRunnable=info, stdout, logfile
log4j.logger.java.sql.Connection=debug, sqlfile
#log4j.logger.com.scenic.queue.runnable = DEBUG, stdout
#log4j.logger.com.scenic.datasource.DynamicRoutingDataSource = DEBUG, debugfile
#log4j.logger.com.scenic.mas = INFO, masfile
#log4j.logger.com.scenic.collect = INFO, solidfile