log4j.properties的配置

#初始化类中要使用的Logger对象实例：log4j.rootLogger = [ level ] , appenderName1, appenderName2, …
#第一个参数是日志级别(DEBUG、INFO、WARN、ERROR...)，后边参数是定义的appenderName(console,logFile,rollingFile...)
#log4j.rootLogger = INFO, console, dailyFile
log4j.rootLogger = INFO, console, dailyFile
#表示Logger不会在父Logger的appender里输出，默认为true。
log4j.additivity.org.apache = false


#子Logger...
#log4j.category.com.test = DEBUG, console, dailyFile
#log4j.category.java.sql = DEBUG, console, dailyFile
#log4j.category.com.ibatis = DEBUG, console, dailyFile


#Threshold : 指定日志信息的最低输出级别，默认为DEBUG。
#ImmediateFlush=true : 表示所有消息都会被立即输出，设为false则不输出，默认值是true。
#Append=false : true表示消息增加到指定文件中，false则将消息覆盖指定的文件内容，默认值是true。
#File=D:/logs/logging.log4j : 指定消息输出到logging.log4j文件中。
#MaxFileSize=100KB：后缀可以是KB, MB 或者GB。在日志文件到达该大小时，将会自动滚动，即将原来的内容移到logging.log4j.1文件中。
#MaxBackupIndex=2：指定可以产生的滚动文件的最大数，例如，设为2则可以产生logging.log4j.1，logging.log4j.2两个滚动文件和一个logging.log4j文件。


# 控制台(console)
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyyMMddHHmmss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n


# 每天产生一个日志文件(dailyFile)
log4j.appender.dailyFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.dailyFile.Threshold=DEBUG
log4j.appender.dailyFile.ImmediateFlush=true
log4j.appender.dailyFile.Append=true
log4j.appender.dailyFile.File=${catalina.home}/logs/log.log4j
log4j.appender.dailyFile.DatePattern='.'yyyy-MM-dd
log4j.appender.dailyFile.layout=org.apache.log4j.PatternLayout
log4j.appender.dailyFile.layout.ConversionPattern=%d{yyyyMMddHHmmss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n

# 用于输出sql语句，如果不能输出，打开子Logger试试
log4j.logger.com.ibatis = DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG
log4j.logger.java.sql.Connection = DEBUG
log4j.logger.java.sql.Statement = DEBUG
log4j.logger.java.sql.PreparedStatement = DEBUG
log4j.logger.java.sql.ResultSet = DEBUG


# 日志文件(logFile)
log4j.appender.logFile=org.apache.log4j.FileAppender
log4j.appender.logFile.Threshold=DEBUG
log4j.appender.logFile.ImmediateFlush=true
log4j.appender.logFile.Append=true
log4j.appender.logFile.File=D:/logs/log.log4j
log4j.appender.logFile.layout=org.apache.log4j.PatternLayout
log4j.appender.logFile.layout.ConversionPattern=%d{yyyyMMddHHmmss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n


# 文件大小到达指定尺寸的时候产生一个新的文件(rollingFile)
log4j.appender.rollingFile=org.apache.log4j.RollingFileAppender
log4j.appender.rollingFile.Threshold=DEBUG
log4j.appender.rollingFile.ImmediateFlush=true
log4j.appender.rollingFile.Append=true
log4j.appender.rollingFile.File=D:/logs/log.log4j
log4j.appender.rollingFile.MaxFileSize=200KB
log4j.appender.rollingFile.MaxBackupIndex=50
log4j.appender.rollingFile.layout=org.apache.log4j.PatternLayout
log4j.appender.rollingFile.layout.ConversionPattern=%d{yyyyMMddHHmmss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n


# 应用于socket
log4j.appender.socket=org.apache.log4j.net.SocketAppender
log4j.appender.socket.RemoteHost=localhost
log4j.appender.socket.Port=5001
log4j.appender.socket.LocationInfo=true
# Set up for Log Factor 5
log4j.appender.socket.layout=org.apache.log4j.PatternLayout
log4j.appender.socket.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# Log Factor 5 Appender
log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender
log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000


# 发送日志到指定邮件
log4j.appender.mail=org.apache.log4j.net.SMTPAppender
log4j.appender.mail.Threshold=FATAL
log4j.appender.mail.BufferSize=10
log4j.appender.mail.From = xxx@mail.com
log4j.appender.mail.SMTPHost=mail.com
log4j.appender.mail.Subject=Log4J Message
log4j.appender.mail.To= xxx@mail.com
log4j.appender.mail.layout=org.apache.log4j.PatternLayout
log4j.appender.mail.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n


# 应用于数据库
log4j.appender.database=org.apache.log4j.jdbc.JDBCAppender
log4j.appender.database.URL=jdbc:mysql://localhost:3306/test
log4j.appender.database.driver=com.mysql.jdbc.Driver
log4j.appender.database.user=root
log4j.appender.database.password=
log4j.appender.database.sql=INSERT INTO LOG4J (Message) VALUES('=[%-5p] %d(%r) --> [%t] %l: %m %x %n')
log4j.appender.database.layout=org.apache.log4j.PatternLayout
log4j.appender.database.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

如果不在src下，改变路径需要在web.xml中配置

<context-param>  
    <param-name>log4jConfigLocation</param-name>  
    <param-value>/WEB-INF/classes/config/log4j.properties</param-value>  
    <!--  也可以这样写<param-value>classpath:config/log4j.properties</param-value> -->  
</context-param>

我在用的配置

#rootLogger[即普通的Logger.getLogger()获取到的] start====================================================#
log4j.rootLogger=DEBUG,CONSOLE,A
log4j.addivity.org.apache=false

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=DEBUG
log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=gbk
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout

log4j.appender.A=org.apache.log4j.DailyRollingFileAppender  
log4j.appender.A.File=${catalina.home}/logs/cseen/root_log/cseen.log
log4j.appender.A.DatePattern='.'yyyy-MM-dd
log4j.appender.A.layout=org.apache.log4j.PatternLayout  
log4j.appender.A.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-4r [%t] %-5p %c.%M(%F:%L)  %x - %m%n
#rootLogger end==============================================================================#

#InfoLog[即普通的Logger.getLogger("InfoLog")获取到的] start====================================================#
log4j.logger.InfoLog=OFF,B
#不继承rootLogger的设置
log4j.additivity.InfoLog = false
log4j.appender.B=org.apache.log4j.RollingFileAppender
log4j.appender.B.File=${catalina.home}/logs/cseen/info_log/cseen.log
log4j.appender.B.layout=org.apache.log4j.PatternLayout
log4j.appender.B.layout.ConversionPattern=[%p] %-d{yyyy-MM-dd HH:mm:ss} [%c %M] %m%n
#InfoLog end====================================================#

#ErrorLog[即普通的Logger.getLogger("ErrorLog")获取到的] start====================================================#
log4j.logger.ErrorLog=OFF,C
#不继承rootLogger的设置
log4j.additivity.ErrorLog = false
log4j.appender.C=org.apache.log4j.RollingFileAppender
log4j.appender.C.File=${catalina.home}/logs/cseen/error_log/cseen.log
log4j.appender.C.layout=org.apache.log4j.PatternLayout
log4j.appender.C.layout.ConversionPattern=[%p] %-d{yyyy-MM-dd HH:mm:ss} [%c %M] %m%n
#ErrorLog end====================================================#

#其他jar包log设置
#log4j.logger.com.opensymphony.oscache=WARN
#log4j.logger.net.sf.navigator=WARN
#log4j.logger.org.apache.commons=WARN
#log4j.logger.org.apache.struts=WARN
#log4j.logger.org.displaytag=WARN
log4j.logger.org.springframework=WARN
#log4j.logger.org.apache.velocity=FATAL

#log4j.logger.jdbc.sqltiming=INFO
#log4j.logger.jdbc.audit=OFF
#log4j.logger.jdbc.resultset=OFF
#log4j.logger.jdbc.sqlonly=INFO

log4j.logger.druid.sql=INFO
log4j.logger.druid.sql.DataSource=info
log4j.logger.druid.sql.Connection=info
log4j.logger.druid.sql.Statement=info
log4j.logger.druid.sql.ResultSet=info

log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
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原文地址：https://www.cnblogs.com/jinzhiming/p/6126075.html