Log4j配置指南大汇总

1、在工程中引入log4j-1.2.12.jar和commons-logging.jar.
commons-logging.jar的版本为1.0.3,低版本的配置稍有不同
2、在WEB-INF\classes目录下新建commons-logging.properties文件，文件内容如下:

org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger

此行将log实现指定为Log4j
3、在WEB-INF\classes目录下新建log4j.properties文件,简单的配置文件示例如下：

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>

<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>

注意一：在上述实现类中也可以选用Log4JCategoryLog,但是会出现一些异常：FAIL - Encountered exception java.lang.NoSuchMethodError:org.apache.log4j.Category.log（****）

原因：commons-logger.jar和你的log4j.jar版本不兼容。前者是对后者的一个封装，而hibernate中主要是使用前者。前者的功能就是：它封装了一些通常的日志类，比如log4j，java.util.logging.Logger 等，使用的log4j，但是由于版本不对，commons-logger中用了log4j中的那个类，在当前的log4j版本中已经不存在了，所以报错

解决方法：将class目录下commons-logging.properties
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JCategoryLog
更改为
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger

注意二：在配置过程中我log4j.properties放于WEB-INF目录下，并修改相应的log4jConfigLocation，结果没有成功，不过用上述的配置没有问题

注意三：在配置输出路径时由于粗心写成如下：

log4j.appender.file.File=D:\log.log

没有看到任何结果，后来发现路径写错拉，这点要注意啊，呵呵

log4j.appender.file.File=D:/log.log

网友例一：功能比较多

LOG4J的配置之简单使它遍及于越来越多的应用中了：Log4J配置文件实现了输出到控制台、文件、回滚文件、发送日志邮件、输出到数据库日志表、自定义标签等全套功能。择其一二使用就够用了，

log4j.rootLogger = DEBUG , CONSOLE , A1 , im
log4j.addivity.org.apache = true



#应用于控制台

log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender
log4j.appender.Threshold = DEBUG
log4j.appender.CONSOLE.Target = System.out
log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n
#log4j.appender.CONSOLE.layout.ConversionPattern = [ start ] %d{DATE} [ DATE ] %n%p [ PRIORITY ] %n%x [ NDC ] %n%t [ THREAD ] n%c [ CATEGORY ] %n%m [ MESSAGE ] %n%n


#应用于文件

log4j.appender.FILE = org.apache.log4j.FileAppender
log4j.appender.FILE.File = file.log
log4j.appender.FILE.Append = false
log4j.appender.FILE.layout = org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n
#UsethislayoutforLogFactor 5 analysis



#应用于文件回滚

log4j.appender.ROLLING_FILE = org.apache.log4j.RollingFileAppender
log4j.appender.ROLLING_FILE.Threshold = ERROR
log4j.appender.ROLLING_FILE.File = rolling.log
log4j.appender.ROLLING_FILE.Append = true
log4j.appender.ROLLING_FILE.MaxFileSize = 10KB
log4j.appender.ROLLING_FILE.MaxBackupIndex = 1
log4j.appender.ROLLING_FILE.layout = org.apache.log4j.PatternLayout
log4j.appender.ROLLING_FILE.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%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
#SetupforLogFacter 5
log4j.appender.SOCKET.layout = org.apache.log4j.PatternLayout
log4j.appender.SOCET.layout.ConversionPattern = [ start ] %d{DATE} [ DATE ] %n%p [ PRIORITY ] %n%x [ NDC ] %n%t [ THREAD ] %n%c [ CATEGORY ] %n%m [ MESSAGE ] %n%n


#LogFactor 5 Appender
log4j.appender.LF5_APPENDER = org.apache.log4j.lf5.LF5Appender
log4j.appender.LF5_APPENDER.MaxNumberOfRecords = 2000



#发送日志给邮件

log4j.appender.MAIL = org.apache.log4j.net.SMTPAppender
log4j.appender.MAIL.Threshold = FATAL
log4j.appender.MAIL.BufferSize = 10
log4j.appender.MAIL.From = [email protected]
log4j.appender.MAIL.SMTPHost = www.wusetu.com
log4j.appender.MAIL.Subject = Log4JMessage
log4j.appender.MAIL.To = [email protected]
log4j.appender.MAIL.layout = org.apache.log4j.PatternLayout
log4j.appender.MAIL.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n



#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 = INSERTINTOLOG4J(Message)VALUES(' [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n')
log4j.appender.DATABASE.layout = org.apache.log4j.PatternLayout
log4j.appender.DATABASE.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n


log4j.appender.A1 = org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File = SampleMessages.log4j
log4j.appender.A1.DatePattern = yyyyMMdd-HH'.log4j'
log4j.appender.A1.layout = org.apache.log4j.xml.XMLLayout

#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 = [email protected]

log4j.appender.im.layout = org.apache.log4j.PatternLayout
log4j.appender.im.layout.ConversionPattern = [ framework ] %d-%c-%-4r [ %t ] %-5p%c%x-%m%n

网友例二：比较实用

#root输出源配置
log4j.rootLogger = DEBUG , rootlog
log4j.appender.rootlog = org.apache.log4j.RollingFileAppender
log4j.appender.rootlog.MaxFileSize = 50000KB
log4j.appender.rootlog.MaxBackupIndex = 0
log4j.appender.rootlog.file = D:/jakarta-tomcat- 4.1.30 /webapps/ROOT/logs/all.log
log4j.appender.rootlog.layout = org.apache.log4j.PatternLayout
log4j.appender.rootlog.layout.ConversionPattern = %d%-5p%m%n


#debug输出源配置
log4j.logger.debuglog = DEBUG , debuglog
log4j.appender.debuglog = org.apache.log4j.RollingFileAppender
log4j.appender.debuglog.MaxFileSize = 50000KB
log4j.appender.debuglog.MaxBackupIndex = 0
log4j.appender.debuglog.file = D:/jakarta-tomcat- 4.1.30 /webapps/ROOT/logs/debug.log
log4j.appender.debuglog.layout = org.apache.log4j.PatternLayout
log4j.appender.debuglog.layout.ConversionPattern = %m%n

#info输出源配置
log4j.logger.infolog = DEBUG , infolog
log4j.appender.infolog = org.apache.log4j.RollingFileAppender
log4j.appender.infolog.MaxFileSize = 50000KB
log4j.appender.infolog.MaxBackupIndex = 0
log4j.appender.infolog.file = D:/jakarta-tomcat- 4.1.30 /webapps/ROOT/logs/info.log
log4j.appender.infolog.layout = org.apache.log4j.PatternLayout
log4j.appender.infolog.layout.ConversionPattern = %m%n

#warn输出源配置
log4j.logger.warnlog = DEBUG , warnlog
log4j.appender.warnlog = org.apache.log4j.RollingFileAppender
log4j.appender.warnlog.MaxFileSize = 50000KB
log4j.appender.warnlog.MaxBackupIndex = 0
log4j.appender.warnlog.file = D:/jakarta-tomcat- 4.1.30 /webapps/ROOT/logs/warn.log
log4j.appender.warnlog.layout = org.apache.log4j.PatternLayout
log4j.appender.warnlog.layout.ConversionPattern = %d%X%-5p%m%n

#error输出源配置
log4j.logger.errorlog = DEBUG , errorlog
log4j.appender.errorlog = org.apache.log4j.RollingFileAppender
log4j.appender.errorlog.MaxFileSize = 50000KB
log4j.appender.errorlog.MaxBackupIndex = 0
log4j.appender.errorlog.file = D:/jakarta-tomcat- 4.1.30 /webapps/ROOT/logs/error.log
log4j.appender.errorlog.layout = org.apache.log4j.PatternLayout
log4j.appender.errorlog.layout.ConversionPattern = %d%x%-5p%m%n

网友例二：其余的

在spring+hibernate+struts项目开发中的log4j配置
关键词： log4j.rootLogge

##*********************自定义log4j配置*******************************##
###copybyMSY###

###设置根Logger级别INFO , 输出地MSY，MSY2##
log4j.rootLogger = DEBUG , MSY , MSY2
设置com.hcinfo.velocity域对应的级别INFO , DEBUG , WARN , ERROR和输出地MSY，MSY2
log4j.category.com.hcinfo.velocity = DEBUG
###定义stdout的输出到控制断###
#log4j.appender.MSY = org.apache.log4j.ConsoleAppender
#log4j.appender.MSY.Target = System.out
###定义stdout布局模式为PatternLayout###
#log4j.appender.MSY.layout = org.apache.log4j.PatternLayout
###定义stdout的输出格式###
#log4j.appender.MSY.layout.ConversionPattern = %d{ABSOLUTE}%5p%c{ 1 }:%L-%m%n
###定义MSY输出到文件（文件大小到达指定尺寸的时候产生一个新的文件）###
log4j.appender.MSY2 = org.apache.log4j.RollingFileAppender
###文件位置###
log4j.appender.MSY2.File = e:/sys2.txt
###文件最大长度###
log4j.appender.MSY2.MaxFileSize = 500KB
###备份文件数目###
log4j.appender.MSY2.MaxBackupIndex = 1
log4j.appender.MSY2.layout = org.apache.log4j.PatternLayout
log4j.appender.MSY2.layout.ConversionPattern = %d{yyyy-MM-ddHH:mm:ss , SSS} [ %t ] [ %c ] [ %p ] -%m%n
###配置日志输出的格式##

###格式说明
#-X号:X信息输出时左对齐；
#%p:日志信息级别
#%d{}:日志信息产生时间
#%c:日志信息所在地（类名）
#%m:产生的日志具体信息
#%n:输出日志信息换行

###下面是定义hibernateLOG4J配置格式###

###directlogmessagestostdout###

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE}%5p%c{ 1 }:%L-%m%n

###directmessagestofilehibernate.log###
#log4j.appender.file = org.apache.log4j.FileAppender
#log4j.appender.file.File = hibernate.log
#log4j.appender.file.layout = org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern = %d{ABSOLUTE}%5p%c{ 1 }:%L-%m%n

###setloglevels-formoreverboseloggingchange'info'to'debug'###

###在次可定义输出输出端stdout###
log4j.rootLogger = warn , stdout

log4j.logger.net.sf.hibernate = info

###logjusttheSQL
#log4j.logger.net.sf.hibernate.SQL = debug

###logJDBCbindparameters###
log4j.logger.net.sf.hibernate.type = info

###logschemaexport/update###
log4j.logger.net.sf.hibernate.tool.hbm2ddl = debug

###logcacheactivity###
#log4j.logger.net.sf.hibernate.cache = debug

###logjdbcresourceacquisition
#log4j.logger.net.sf.hibernate.impl.BatcherImpl = debug

###enablethefollowinglineifyouwanttotrackdownconnection###
###leakageswhenusingDriverManagerConnectionProvider###
#log4j.logger.net.sf.hibernate.connection.DriverManagerConnectionProvider = trace

##定义log4j的spring配置##
log4j.rootLogger = DEBUG , Spring

log4j.appender.Spring = org.apache.log4j.ConsoleAppender
log4j.appender.Spring.Target = System.out
log4j.appender.Spring.layout = org.apache.log4j.PatternLayout
log4j.appender.Spring.layout.ConversionPattern = %d{ABSOLUTE}%5p%c{ 1 }:%L-%m%n
####

web.xml中的修改：

这样配置文件以及日志文件可以在spring的帮助下，放到开发环境中的任意位置


在这里定位配置文件，需要的是从root开始的绝对路径

,或者设置个

< context-param >
< param-name > log4jConfigLocation </ param-name >
< param-value > classpath:log4j.properties </ param-value >
</ context-param >

<!-- Spring默认刷新Log4j配置文件的间隔,单位为millisecond -->
< context-param >
< param-name > log4jRefreshInterval </ param-name >
< param-value > 60000 </ param-value >
</ context-param >

<!-- Springlog4jConfigloader -->
< listener >
< listener-class > org.springframework.web.util.Log4jConfigListener </ listener-class >
</ listener >

设置监听器

< context-param >
< param-name > log4jConfigLocation </ param-name >
< param-value > classpath:log4j.properties </ param-value >
</ context-param >
< servlet >
< servlet-name > log4j </ servlet-name >
< servlet-class >
org.springframework.web.util.Log4jConfigServlet
</ servlet-class >
< load-on-startup > 0 </ load-on-startup >
</ servlet >

==================================

什么都做完了，那该测试了，

在action中增加

static Logger_log = Logger.getLogger( this .getClass().getName);
// log4j（1）然后就可以在需要的地方进行日志记载
_log.debug( " 做下测试.debug " );
_log.info( " 做下测试.info " );
_log.warn( " 做下测试.warn " );
_log.error( " 做下测试.error " );
_log.fatal( " 做下测试.fatal " );

补充：

有时候log日志的位置总觉的绝对路径不爽，那你可以用参数啊，比如${webapp.root}/WEB-INF/log/就是你的项目路径里的了，具体在哪里你自己看了