tomcat日志，默认路径在${catalina.home}/logs目录下，默认使用的是tomcat自己封装的logging工具类，默认配置文件使用的${catalina.home}/conf/logging.properties
默认的配置不满足按天或按大小将日志区分，用以备份或转移或删除，经常会出现日志文件超大，磁盘空间不够的情况（就算磁盘够，一段时间后的日志也应该及时清理和压缩起来）。
考虑到这种需求，使用log4j的配置，将tomcat的logging拦截起来，配置如下：
采用log4j配置，适用版本为：6.x（4.x或7.x的差别还是有的 不过不大），有配置属性的改动，步骤如下：
1. 修改${catalina.home}/conf/context.xml
修改：<Context >为<Context swallowOutput="true" >
2. 拷贝log4j.jar到${catalina.home}/lib下
3. 拷贝tomcat-juli-adapters.jar到${catalina.home}/lib下
4. 拷贝tomcat-juli.jar到${catalina.home}/bin下，在该目录会存在该文件，覆盖 即可
5. 拷贝log4j.properties到${catalina.home}/lib下，配置如下：
1. 修改${catalina.home}/conf/context.xml
修改：<Context >为<Context swallowOutput="true" >
2. 拷贝log4j.jar到${catalina.home}/lib下
3. 拷贝tomcat-juli-adapters.jar到${catalina.home}/lib下
4. 拷贝tomcat-juli.jar到${catalina.home}/bin下，在该目录会存在该文件，覆盖 即可
5. 拷贝log4j.properties到${catalina.home}/lib下，配置如下：
log4j.rootLogger=INFO,CATALINA
log4j.logger.org.apache.catalina=WARN,CONSOLE
#log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=INFO
log4j.logger.org.apache.catalina.core=WARN,CATALINA
log4j.logger.org.apache.catalina.session=WARN,CATALINA
#log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
# Define all the appenders
log4j.appender.CONSOLE=org.apache.log4j.DailyRollingFileAppender
log4j.appender.CONSOLE.File=${catalina.home}/logs/catalina.out
log4j.appender.CONSOLE.Append=true
log4j.appender.CONSOLE.Encoding=UTF-8
# Roll-over the log once per day
log4j.appender.CONSOLE.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} %-5p %c- %m%n
# Define all the appenders
log4j.appender.CATALINA=org.apache.log4j.DailyRollingFileAppender
log4j.appender.CATALINA.File=${catalina.home}/logs/catalina
log4j.appender.CATALINA.Append=true
log4j.appender.CATALINA.Encoding=UTF-8
# Roll-over the log once per day
log4j.appender.CATALINA.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout
log4j.appender.CATALINA.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c- %m%n
log4j.appender.LOCALHOST=org.apache.log4j.DailyRollingFileAppender
log4j.appender.LOCALHOST.File=${catalina.home}/logs/localhost
log4j.appender.LOCALHOST.Append=true
log4j.appender.LOCALHOST.Encoding=UTF-8
log4j.appender.LOCALHOST.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.LOCALHOST.layout = org.apache.log4j.PatternLayout
log4j.appender.LOCALHOST.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c- %m%n
log4j.appender.MANAGER=org.apache.log4j.DailyRollingFileAppender
log4j.appender.MANAGER.File=${catalina.home}/logs/manager
log4j.appender.MANAGER.Append=true
log4j.appender.MANAGER.Encoding=UTF-8
log4j.appender.MANAGER.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.MANAGER.layout = org.apache.log4j.PatternLayout
log4j.appender.MANAGER.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c- %m%n
log4j.appender.HOST-MANAGER=org.apache.log4j.DailyRollingFileAppender
log4j.appender.HOST-MANAGER.File=${catalina.home}/logs/host-manager.
log4j.appender.HOST-MANAGER.Append=true
log4j.appender.HOST-MANAGER.Encoding=UTF-8
log4j.appender.HOST-MANAGER.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.HOST-MANAGER.layout = org.apache.log4j.PatternLayout
log4j.appender.HOST-MANAGER.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5p %c- %m%n
# Configure which loggers log to which appenders
log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=INFO, LOCALHOST
log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager]=INFO, MANAGER
log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager]=INFO, HOST-MANAGER
其余配置项按正常配置走起。
