关于日志的等级 的配置

#这里定义能显示到的最低级别,若定义到INFO级别,则看不到DEBUG级别的信息了~!
log4j.rootLogger=INFO,allLog

# DAO层 log记录到dao.log 控制台 和 总日志文件
log4j.logger.DAO=INFO,dao,Console,allLog  
   
# 业务层 log记录到service.log   控制台 和 总日志文件
log4j.logger.SERVICE=INFO,service,Console,allLog

# 测试 及 日常日志打印  log记录到 common.log   控制台 和 总日志文件
log4j.logger.COMMON=INFO,common,Console,allLog



log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d %p - %C{1}.%M(%L) - %m%n


log4j.appender.service=org.apache.log4j.DailyRollingFileAppender
log4j.appender.service.file=${project.root}/WEB-INF/log/service.txt
log4j.appender.service.DatePattern='.'yyyy-MM-dd
log4j.appender.service.layout=org.apache.log4j.PatternLayout
log4j.appender.service.layout.ConversionPattern=%d %p - %C{1}.%M(%L) - %m%n


log4j.appender.allLog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.allLog.file=${project.root}/WEB-INF/log/allLog.txt
log4j.appender.allLog.DatePattern='.'yyyy-MM-dd
log4j.appender.allLog.layout=org.apache.log4j.PatternLayout
log4j.appender.allLog.layout.ConversionPattern=%d %p - %C{1}.%M(%L) - %m%n


log4j.appender.dao=org.apache.log4j.DailyRollingFileAppender
log4j.appender.dao.file=${project.root}/WEB-INF/log/dao.txt
log4j.appender.dao.DatePattern='.'yyyy-MM-dd
log4j.appender.dao.layout=org.apache.log4j.PatternLayout
log4j.appender.dao.layout.ConversionPattern=%d %p - %C{1}.%M(%L) - %m%n

log4j.appender.common=org.apache.log4j.DailyRollingFileAppender
log4j.appender.common.file=${project.root}/WEB-INF/log/common.txt
log4j.appender.common.DatePattern='.'yyyy-MM-dd
log4j.appender.common.layout=org.apache.log4j.PatternLayout
log4j.appender.common.layout.ConversionPattern=%d %p - %C{1}.%M(%L) - %m%n

Log4J配置后， log4j:ERROR setFile(null,true) call failed. 报错：java.io.FileNotFoundException: \log\mytest2.log (系统找不到指定的路径。) 收藏
是log4j.properties与tomcat的log4j重名的原因

你把/WEB-INF/classes/log4j.properties的log4j配置文件改个名字就OK了！(如:log.properties)

因为在tomcat启动是默认去找log4j.properties,但此时Listener还没有起来,tomcat就要往\WEB-INF\logs\log4j.log 写日志就找不到了
相关spring log4j的资料

web.xml 配置如下
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>project.root</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>6000</param-value>
</context-param>
   <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
   </context-param>

<listener> 
   <listener-class> org.springframework.web.util.Log4jConfigListener </listener-class>
</listener>


转：http://7454103.iteye.com/blog/688870>