# 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=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 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=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 回滚文件(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=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 定期回滚日志文件(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=D:/logs/log.log4j
log4j.appender.dailyFile.DatePattern=‘.‘yyyy-MM-dd
log4j.appender.dailyFile.layout=org.apache.log4j.PatternLayout
log4j.appender.dailyFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 应用于socket
log4j.appender.socket=org.apache.log4j.RollingFileAppender
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

# 自定义Appender
log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender
log4j.appender.im.host = mail.cybercorlin.net
log4j.appender.im.username = username
log4j.appender.im.password = password
log4j.appender.im.recipient = corlin@cybercorlin.net
log4j.appender.im.layout=org.apache.log4j.PatternLayout
log4j.appender.im.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

log4j.additivity.myTest1 = false

log4j.logger.myTest1=DEBUG, test1, stdout

另外：

log4j.rootCategory

• 是对根类的设置，如不说明，以下的子类都要继承这些设置

log4j.category.*

• 是对自定义类的设置，可以对类、包和工程单独设置

Category的家族关系是通过“.”来说明的，比如x是x.y的父类。
默认情况下，子类要继承父类的全部设置，比如：

• log4j.rootCategory=INFO, dest1
• log4j.category.MyCategory=DEBUG

1. dest1会输出INFO以上的消息
2. 对于Category logger = Category.getInstance("MyCategory")会输出DEBUG以上的消息，因为MyCategory继承了根类的设置，输出到dest1

如果使用下面的设置，每条消息会在dest1中输出两次：

• log4j.rootCategory = INFO, dest1
• log4j.category.MyCategory = DEBUG, dest1

记住，MyCategory继承了根类的设置。
可以指定子类不继承父类的设置，方法是指定log4j.additivity.*=false，如上例中：

• log4j.rootCategory = INFO, dest1
• log4j.additivity.MyCategory = false
• log4j.category.MyCategory = DEBUG, dest1

log4j.xml 的配置方式：

Xml 代码

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">    
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">    
    <appender name="appender1"  
        class="org.apache.log4j.RollingFileAppender">  
        <param name="File" value="logfile08.html" />  
        <param name="MaxFileSize" value="1MB" />  
        <param name="MaxBackupIndex" value="5" />  
        <layout class="org.apache.log4j.HTMLLayout">  
        </layout>  
    </appender>    
    <root>  
        <level value="debug" />  
        <appender-ref ref="appender1" />  
    </root>  
</log4j:configuration>  

发送email通知管理员：
 1. 首先下载JavaMail和JAF, 
  http://java.sun.com/j2ee/ja/javamail/index.html
  http://java.sun.com/beans/glasgow/jaf.html
 在项目中引用mail.jar和activation.jar。
 2. 写配置文件
 # 将日志发送到email
 log4j.logger.MailLog=WARN,A5
 #  APPENDER A5
 log4j.appender.A5=org.apache.log4j.net.SMTPAppender
 log4j.appender.A5.BufferSize=5
 log4j.appender.A5.To=chunjie@yeqiangwei.com
 log4j.appender.A5.From=error@yeqiangwei.com
 log4j.appender.A5.Subject=ErrorLog
 log4j.appender.A5.SMTPHost=smtp.263.net
 log4j.appender.A5.layout=org.apache.log4j.PatternLayout
 log4j.appender.A5.layout.ConversionPattern=%-4r %-5p [%t] %37c %3x - %m%n
 3.调用代码：
 //把日志发送到mail

 Logger logger3 = Logger.getLogger("MailLog");
 logger3.warn("warn!!!");
 logger3.error("error!!!");
 logger3.fatal("fatal!!!");

参考：

Log4J配置 

Log4J日志配置详解

org.apache.log4j.Logger详解

log4j.properties配置详解