SOA On Tomcat专题6--Log-优快云博客

本文链接：https://blog.youkuaiyun.com/zgyzgyzgy3338759/article/details/9978779

日志是排错的重要信息来源，整日志我花了很多时间，最终的结果却不尽人意，但就这样吧，昨晚做梦还梦到处理日志。工作这一年出现了神经衰落，和本身的性格有关吧。。。

一.Tomcat原始处理日志的功能

Tomcat原始处理日志的代码在tomcat-juli.jar，这个jar包19K，它回去寻找${catalina.home}/conf/logging.properties，如果默认有4个日志文件，如果不需要这么多个文件则安需要选取，把红色标记的去除就少了localhost.log这个日志了

handlers = 1catalina.org.apache.juli.FileHandler, 2localhost.org.apache.juli.FileHandler, 3manager.org.apache.juli.FileHandler, 4host-manager.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler

.handlers = 1catalina.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler

############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################

1catalina.org.apache.juli.FileHandler.level = FINE
1catalina.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
1catalina.org.apache.juli.FileHandler.prefix = catalina.

2localhost.org.apache.juli.FileHandler.level = FINE
2localhost.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
2localhost.org.apache.juli.FileHandler.prefix = localhost.

3manager.org.apache.juli.FileHandler.level = FINE
3manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
3manager.org.apache.juli.FileHandler.prefix = manager.

4host-manager.org.apache.juli.FileHandler.level = FINE
4host-manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
4host-manager.org.apache.juli.FileHandler.prefix = host-manager.

java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################

org.apache.catalina.core.ContainerBase.[Catalina].[localhost].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].handlers = 2localhost.org.apache.juli.FileHandler

org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager].handlers = 3manager.org.apache.juli.FileHandler

org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/host-manager].handlers = 4host-manager.org.apache.juli.FileHandler

二.Tomcat处理日志升级

按照官方说法，同时它也说配置log4j.xml是有缺陷的。这个60K的tomcat-juli.jar的LogSource.java会检测到classpath是否存tomcat-juli-adapters.jar中的Log4JLogger.class，如果存在那就会使用Class.forName的方式将Log4j实例化，先去解析log4j.xml，找不到再去寻找log4j.properties，然后setLogImplementation("org.apache.juli.logging.impl.Log4JLogger")。按理来说，既然实现方式替换为Log4j了，那么Log4j应该能打印出所有的日志才对，但不是的，原始的catalina.log仍然打印出Log4j缺少的许多重要信息。好吧，也许是我方向错了，先把工作完成了，能用，细的方面后面再追究。

Follow the following steps to setup a file named tomcat.log that has internal Tomcat logging output to it:

Create a file called log4j.properties with the following content and save it into $CATALINA_HOME/lib.

            log4j.rootLogger=debug, R 
            log4j.appender.R=org.apache.log4j.RollingFileAppender 
            log4j.appender.R.File=${catalina.home}/logs/tomcat.log 
            log4j.appender.R.MaxFileSize=10MB 
            log4j.appender.R.MaxBackupIndex=10 
            log4j.appender.R.layout=org.apache.log4j.PatternLayout 
            log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n 
            log4j.logger.org.apache.catalina=DEBUG, R

Download Log4J (v1.2 or later) and place the log4j jar in $CATALINA_HOME/lib.
Build or download the additional logging components. See the extras components documentation for details.
Replace $CATALINA_HOME/bin/tomcat-juli.jar with output/extras/tomcat-juli.jar.
Place output/extras/tomcat-juli-adapters.jar in $CATALINA_HOME/lib.
Start Tomcat