tomcat8使用log4j分割日志的流程

1.下载log4j-1.2.17.jar（http://www.apache.org/dist/logging/log4j/1.2.17/）

2.下载 tomcat-juli.jar（http://www.apache.org/dist/tomcat/tomcat-8/v8.0.39/bin/extras/）

3.下载 tomcat-juli-adapters.jar（http://www.apache.org/dist/tomcat/tomcat-8/v8.0.39/bin/extras/） (若为其他版本须更名为tomcat-juli.jar和tomcat-juli-adapters.jar)

替换jar包修改配置文件

1.把log4j-1.2.17.jar和tomcat-juli-adapters.jar放到$CATALINAHOME/lib下；

2.用新下载的tomcat-juli.jar包替换掉$CATALINAHOME/bin/tomcat-juli.jar包。（名称必须为tomcat-juli.jar）；

3.删除$CATALINA_BASE/conf/logging.properties(或者更改名称)

4.修改 Tomcat 的 conf/context.xml 文件，

将<Context>改为<Context swallowOutput="true">

5.新建log4j.properties 放到$CATALINA_HOME/lib目录下；

log4j.rootLogger=INFO, CATALINA,LOCALHOST,MANAGER,HOST-MANAGER

# Define all the appenders
log4j.appender.CATALINA=org.apache.log4j.RollingFileAppender
log4j.appender.CATALINA.File=${catalina.base}/logs/catalinas.out
log4j.appender.CATALINA.MaxFileSize=10240KB
log4j.appender.CATALINA.MaxBackupIndex=100
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-HH-mm'.log'
log4j.appender.CATALINA.layout = org.apache.log4j.PatternLayout
log4j.appender.CATALINA.layout.ConversionPattern = %d [%t] %-5p %c- %m%n

log4j.appender.LOCALHOST=org.apache.log4j.RollingFileAppender
log4j.appender.LOCALHOST.File=${catalina.base}/logs/localhost.log
log4j.appender.LOCALHOST.MaxFileSize=10240KB
log4j.appender.LOCALHOST.MaxBackupIndex=100
log4j.appender.LOCALHOST.Append=true
log4j.appender.LOCALHOST.Encoding=UTF-8
log4j.appender.LOCALHOST.layout = org.apache.log4j.PatternLayout
log4j.appender.LOCALHOST.layout.ConversionPattern = %d [%t] %-5p %c- %m%n

log4j.appender.MANAGER=org.apache.log4j.RollingFileAppender
log4j.appender.MANAGER.File=${catalina.base}/logs/manager.log
log4j.appender.MANAGER.MaxFileSize=10240KB
log4j.appender.MANAGER.MaxBackupIndex=100
log4j.appender.MANAGER.Append=true
log4j.appender.MANAGER.Encoding=UTF-8
log4j.appender.MANAGER.layout = org.apache.log4j.PatternLayout
log4j.appender.MANAGER.layout.ConversionPattern = %d [%t] %-5p %c- %m%n

log4j.appender.HOST-MANAGER=org.apache.log4j.RollingFileAppender
log4j.appender.HOST-MANAGER.File=${catalina.base}/logs/host-manager.log
log4j.appender.HOST-MANAGER.MaxFileSize=10240KB
log4j.appender.HOST-MANAGER.MaxBackupIndex=100
log4j.appender.HOST-MANAGER.Append=true
log4j.appender.HOST-MANAGER.Encoding=UTF-8
log4j.appender.HOST-MANAGER.layout = org.apache.log4j.PatternLayout
log4j.appender.HOST-MANAGER.layout.ConversionPattern = %d [%t] %-5p %c- %m%n

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern = %d [%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

6.重启tomcat