log4j日志配置

格式详细：http://blog.csdn.net/dr_guo/article/details/50718063

参考格式：

log4j.rootLogger=INFO, stdout , R      log4j.appender.stdout=org.apache.log4j.ConsoleAppender   log4j.appender.stdout.layout=org.apache.log4j.PatternLayout   log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n       log4j.appender.R=org.apache.log4j.DailyRollingFileAppender   log4j.appender.R.File=D:\\Tomcat 5.5\\logs\\qc.log   log4j.appender.R.layout=org.apache.log4j.PatternLayout   1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n      log4j.logger.com.neusoft=DEBUG   log4j.logger.com.opensymphony.oscache=ERROR   log4j.logger.net.sf.navigator=ERROR   log4j.logger.org.apache.commons=ERROR   log4j.logger.org.apache.struts=WARN   log4j.logger.org.displaytag=ERROR   log4j.logger.org.springframework=DEBUG   log4j.logger.com.ibatis.db=WARN   log4j.logger.org.apache.velocity=FATAL      log4j.logger.com.canoo.webtest=WARN      log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN   log4j.logger.org.hibernate=DEBUG   log4j.logger.org.logicalcobwebs=WARN  log4j.rootCategory=INFO, stdout , Rlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n log4j.appender.R=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.R.File=D:\\Tomcat 5.5\\logs\\qc.loglog4j.appender.R.layout=org.apache.log4j.PatternLayout1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%nlog4j.logger.com.neusoft=DEBUGlog4j.logger.com.opensymphony.oscache=ERRORlog4j.logger.net.sf.navigator=ERRORlog4j.logger.org.apache.commons=ERRORlog4j.logger.org.apache.struts=WARNlog4j.logger.org.displaytag=ERRORlog4j.logger.org.springframework=DEBUGlog4j.logger.com.ibatis.db=WARNlog4j.logger.org.apache.velocity=FATALlog4j.logger.com.canoo.webtest=WARNlog4j.logger.org.hibernate.ps.PreparedStatementCache=WARNlog4j.logger.org.hibernate=DEBUGlog4j.logger.org.logicalcobwebs=WARN 

更详细的配置：

# 文件中配置分别向控制台，文本文件，html文件，多文件（超出指定大小，新建文件），按日期产生文件记录log4j.rootLogger = trace, stdout,file,html,roll,daily# Set the appender named X to be a File appenderlog4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d{DATE} %-4r [%t] %-5p %c %x - %m%n#log4j.appender.stdout.layout.conversionPattern=%d[yyyy/MM/dd HH:mm:ss SS]:%p,%r,%t, %c:%m,%F,%l,%L,%M%n#详细conversionPattern配置，查看http://blog.csdn.net/guoquanyou/article/details/5689652#以下配置的日志是rootLogger的输出#TEXTlog4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=F:/log/log.log log4j.appender.file.Append=falselog4j.appender.file.layout=org.apache.log4j.PatternLayoutlog4j.appender.file.layout.conversionPattern=%d{DATE} %-4r [%t] %-5p %c %x - %m%n#HTMLlog4j.appender.html=org.apache.log4j.FileAppender log4j.appender.html.File=F:/log/log.html #Append可以指定是否追加日志log4j.appender.html.Append=false#可以缩小记录范围，不可扩大log4j.appender.html.Threshold=debug#HTMLLayout不能指定conversionPatternlog4j.appender.html.layout=org.apache.log4j.HTMLLayoutlog4j.appender.html.layout.Title=HTML Layout Example#指定是否记录日志产生的位置log4j.appender.html.layout.LocationInfo=true#多文件，指定大小#超过指定大小，会将文件重命名为filename.suffix.1,再超过将xxx.1命名为xxx.2,当前重命名为xxx.1,若继续超出会覆盖掉xxx.2文件，日志产生先后顺序为xxx.2->xxx.1->xxx#当想要写日志信息转化多个文件要求一样，例如，如果文件大小达到一定的阈值等。#写日志记录信息分成多个文件，必须扩展FileAppender类，并继承其所有属性,使用org.apache.log4j.RollingFileAppender类。log4j.appender.roll=org.apache.log4j.RollingFileAppenderlog4j.appender.roll.File=F:/log/logroll.log #设置日志文件的最大空间log4j.appender.roll.MaxFileSize=20KBlog4j.appender.roll.MaxBackupIndex=2log4j.appender.roll.layout=org.apache.log4j.PatternLayoutlog4j.appender.roll.layout.conversionPattern=%d{DATE} %-4r [%t] %-5p %c %x - %m%n#DAILY#不能指定MaxFileSize，MaxBackupIndexlog4j.appender.daily=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.daily.File=F:/log/logdaily.log log4j.appender.daily.layout=org.apache.log4j.PatternLayoutlog4j.appender.daily.layout.conversionPattern=%d{DATE} %-4r [%t] %-5p %c %x - %m%nlog4j.appender.daily.DatePattern='.' yyyy-MM-dd-HH-mm#DatePattern的可取值#'.' yyyy-MM滚动在每个月的结束和下一个月初#'.' yyyy-MM-dd这是默认值，每天午夜滚动#'.' yyyy-MM-dd-a滚动每一天的午夜和中午#'.' yyyy-MM-dd-HH滚动在每一个小时#'.' yyyy-MM-dd-HH-mm滚动在每一个分钟#'.' yyyy-ww滚动每个星期取决于区域设置时的第一天#可以使用的Appender有：#ConsoleAppender#FileAppender#RollingFileAppender#DailyRollingFileAppender#AppenderSkeleton#AsyncAppender#ExternallyRolledFileAppender#JDBCAppender#JMSAppender#LF5Appender#NTEventLogAppender#NullAppender#SMTPAppender#SocketAppender#SocketHubAppender#SyslogAppender#TelnetAppender#WriterAppender#可选的layout有：#PatternLayout#HTMLLayout#SimpleLayout#DateLayout#XMLLayout

输出到数据库，参见：http://www.yiibai.com/log4j/log4j_logging_database.html

log4j中conversionPattern的各个参数具体含义参见：http://blog.csdn.net/guoquanyou/article/details/5689652