1. web.xml
<!-- 加载Log4J 配置文件 --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>WEB-INF/conf/log4j.properties</param-value> </context-param> <context-param> <param-name>log4jRefreshInterval</param-name> <param-value>3000</param-value> </context-param> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> log4jConfigLocation 配置log4j.properties 文件的位置。也可以这样配置 classpath:log4j.properties
2. 日志文件的位置
1）绝对路径
log4j.appender.R.File=D:/log/xxx.log
2）相对路径：
log4j.appender.R.File=../logs/app.log，将日志记录到tomcat下的logs文件夹；
log4j.appender.R.File=logs/app.log，将日志记录到tomcat的bin目录下的logs文件夹；
（3）使用环境变量相对路径法：程序会优先找jvm环境变量，然后再找系统环境变量，来查找配置文件中的变量。
log4j.appender.logfile.File=${user.dir}/logs/app.log，使用tomcat容器时${user.dir}对应tomcat的bin目录；
log4j.appender.logfile.File=${user.home}/logs/app.log，${user.home}对应操作系统当前用户目录；
log4j.appender.logfile.File=${webApp.root}/logs/app.log，${webApp.root}对应当前应用根目录；
3. 不同框架的日志分开存储：
#all logger output level is 'ERROR' and output position is stdout #so only write our project's DEBUG log and ERROR log of the others log4j.rootLogger=ERROR, stdout, R #log4j.appender is set output postion #log4j.logger is set some package(some package your want output logger specially)=[output level],[...output position] log4j.logger.org.springframework=OFF log4j.logger.org.apache.commons=OFF log4j.logger.org.apache.struts=OFF log4j.logger.org.hibernate=OFF #log4j.logger.org.logicalcobwebs=OFF #only write our project's log(DEBUG) log4j.logger.com.mycompany=DEBUG log4j.logger.org.apache.commons.dbcp=DEBUG, dbcp #log4j.logger.org.logicalcobwebs.proxool=DEBUG, proxool #log4j.logger.org.springframework=DEBUG, spring log4j.logger.org.apache.catalina.core=DEBUG, catalina #in the console log4j.appender.stdout=org.apache.log4j.ConsoleAppender #config stdout position output contain INFO level and up log4j.appender.stdout.Threshold=DEBUG log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=[%-5p] %l:%t - %m %n #in the daily files log4j.appender.R=org.apache.log4j.DailyRollingFileAppender log4j.appender.R.Threshold=DEBUG log4j.appender.R.File=D:/EMR/log/EMR.log log4j.appender.R.DatePattern='.'yyyy-MM-dd'.log' log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%d [%-5p] %l:%t - %m %n log4j.logger.com.statestr=DEBUG log4j.appender.dbcp=org.apache.log4j.DailyRollingFileAppender log4j.appender.dbcp.Threshold=DEBUG log4j.appender.dbcp.File=D:/EMR/log/dbcp.log log4j.appender.dbcp.DatePattern='.'yyyy-MM-dd'.log' log4j.appender.dbcp.layout=org.apache.log4j.PatternLayout log4j.appender.dbcp.layout.ConversionPattern=%d [%-5p] %l:%t - %m %n log4j.appender.proxool=org.apache.log4j.DailyRollingFileAppender log4j.appender.proxool.Threshold=DEBUG log4j.appender.proxool.File=D:/EMR/log/proxool.log log4j.appender.proxool.DatePattern='.'yyyy-MM-dd'.log' log4j.appender.proxool.layout=org.apache.log4j.PatternLayout log4j.appender.proxool.layout.ConversionPattern=%d [%-5p] %l:%t - %m %n log4j.appender.spring=org.apache.log4j.DailyRollingFileAppender log4j.appender.spring.Threshold=DEBUG log4j.appender.spring.File=D:/EMR/log/spring.log log4j.appender.spring.DatePattern='.'yyyy-MM-dd'.log' log4j.appender.spring.layout=org.apache.log4j.PatternLayout log4j.appender.spring.layout.ConversionPattern=%d [%-5p] %l:%t - %m %n log4j.appender.catalina=org.apache.log4j.DailyRollingFileAppender log4j.appender.catalina.Threshold=DEBUG log4j.appender.catalina.File=D:/EMR/log/catalina.log log4j.appender.catalina.DatePattern='.'yyyy-MM-dd'.log' log4j.appender.catalina.layout=org.apache.log4j.PatternLayout log4j.appender.catalina.layout.ConversionPattern=%d [%-5p] %l:%t - %m %n
4. 关闭日志
log4j.logger.org.springframework=OFF log4j.logger.org.apache.commons=OFF log4j.logger.org.apache.struts=OFF log4j.logger.org.hibernate=OFF或者 log4j.logger.org.springframework=WARN log4j.logger.org.apache.commons=WARN log4j.logger.org.apache.struts=WARN log4j.logger.org.hibernate=WARN