log4j在tomcat 和 工程中的配置

按照网上很多配置步骤走都配不通。现在回头看看大部分是版本不一致导致的。

另外log4j做的很灵活除了可以对整个容器进行日志管理以外，还可以对一个工程进行日志管理。如果只有容器里面的日志，那junit中的日志怎么办呢，所以工程的日志管理也很必要。

这里给出一个保证能够使用的配置文件。

og4j1.3在tomcat5中的配置:

1. 关闭tomcat
2. 下载 Commons Logging 包。
3. 把commons-logging.jar拷贝到Tomcat common/lib目录下。
4. 下载Log4j 1.3的包。
   
5. 拷贝log4j-1.3alpha-8.jar到Tomcat common/lib 目录下。
6. 在Tomcat common/classes目录下建一个log4j.properties文件。
7. 重启Tomcat.

Log4j Properties File
#
# Configures Log4j as the Tomcat system logger
#

#
# Configure the logger to output info level messages into a rolling log file.
#
log4j.rootLogger=INFO, R, CONSOLE

#
# To continue using the "catalina.out" file (which grows forever),
# comment out the above line and uncomment the next.
#
#log4j.rootLogger=ERROR, A1

#
# Configuration for standard output ("catalina.out").
#
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
#
# Print the date in ISO 8601 format
#
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n

#
# Configuration for a rolling log file ("tomcat.log").
#
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.DatePattern='.'yyyy-MM-dd
#
# Edit the next line to point to your logs directory.
# The last part of the name is the log file name.
#
log4j.appender.R.File=D:/tomcat/logs/tomcat.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
#
# Print the date in ISO 8601 format
#
log4j.appender.R.layout.ConversionPattern=%d [%t] %-5p %c - %m%n


####################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
#
# Edit the next line to point to your logs directory.
# The last part of the name is the log file name.
#
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
#
# Print the date in ISO 8601 format
#
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
#
# Application logging options
#
#log4j.logger.org.apache=DEBUG
#log4j.logger.org.apache=INFO
#log4j.logger.org.apache.struts=DEBUG
#log4j.logger.org.apache.struts=INFO

在工程中配置log4j1.3：

在工程的src目录下新建 log4j.properties文件如下：

#
# Configures Log4j as the Tomcat system logger
#

#
# Configure the logger to output info level messages into a rolling log file.
#
log4j.rootLogger=info, CONSOLE

#
# To continue using the "catalina.out" file (which grows forever),
# comment out the above line and uncomment the next.
#
#log4j.rootLogger=ERROR, A1

#
# Configuration for standard output ("catalina.out").
#
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
#
# Print the date in ISO 8601 format
#
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n



####################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
#
# Edit the next line to point to your logs directory.
# The last part of the name is the log file name.
#
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
#
# Print the date in ISO 8601 format
#
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
#
# Application logging options
#
#log4j.logger.org.apache=DEBUG
#log4j.logger.org.apache=INFO
#log4j.logger.org.apache.struts=DEBUG
#log4j.logger.org.apache.struts=INFO

然后就OK了。我的工程是struts spring hibernate的，这样做能收集到所有的日志。

参考：

http://minaret.biz/tips/tomcatLogging