log4j.appender.stdout_fileappender log4j_log4j appender自定义

使用slf4j作为日志系统时，由于slf4j只是一个接口，它需要一个具体实现来执行。fileappender log4j

具体参考

由于slf4j统一了API接口，因此，若log4j实现来日志输出，则只需要设置配置文件的内容即可，以下是nutch中默认的log4j.properties。fileappender log4j

# Define some default values that can be overridden by system properties
hadoop.log.dir=.
hadoop.log.file=hadoop.log

# RootLogger - DailyRollingFileAppender
log4j.rootLogger=INFO,DRFA

# Logging Threshold
log4j.threshold=ALL

#special logging requirements for some commandline tools
log4j.logger.org.apache.nutch.crawl.Crawl=INFO,cmdstdout
log4j.logger.org.apache.nutch.crawl.InjectorJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.host.HostInjectorJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.crawl.GeneratorJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.crawl.DbUpdaterJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.host.HostDbUpdateJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.fetcher.FetcherJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.parse.ParserJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.indexer.IndexingJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.indexer.DeleteDuplicates=INFO,cmdstdout
log4j.logger.org.apache.nutch.indexer.CleaningJob=INFO,cmdstdout
log4j.logger.org.apache.nutch.crawl.WebTableReader=INFO,cmdstdout
log4j.logger.org.apache.nutch.host.HostDbReader=INFO,cmdstdout
log4j.logger.org.apache.nutch.parse.ParserChecker=INFO,cmdstdout
log4j.logger.org.apache.nutch.indexer.IndexingFiltersChecker=INFO,cmdstdout
log4j.logger.org.apache.nutch.plugin.PluginRepository=WARN
log4j.logger.org.apache.nutch.api.NutchServer=INFO,cmdstdout

log4j.logger.org.apache.nutch=INFO
log4j.logger.org.apache.hadoop=WARN
log4j.logger.org.apache.zookeeper=WARN
log4j.logger.org.apache.gora=WARN

#
# Daily Rolling File Appender
#

log4j.appender.DRFA=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DRFA.File=${hadoop.log.dir}/${hadoop.log.file}

# Rollver at midnight
log4j.appender.DRFA.DatePattern=.yyyy-MM-dd

# 30-day backup
#log4j.appender.DRFA.MaxBackupIndex=30
log4j.appender.DRFA.layout=org.apache.log4j.PatternLayout

# Pattern format: Date LogLevel LoggerName LogMessage
log4j.appender.DRFA.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} - %m%n
# Debugging Pattern format: Date LogLevel LoggerName (FileName:MethodName:LineNo) LogMessage
#log4j.appender.DRFA.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} (%F:%M(%L)) - %m%n


#
# stdout
# Add *stdout* to rootlogger above if you want to use this 
#

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} (%F:%M(%L)) - %m%n

#
# plain layout used for commandline tools to output to console
#
log4j.appender.cmdstdout=org.apache.log4j.ConsoleAppender
log4j.appender.cmdstdout.layout=org.apache.log4j.PatternLayout
log4j.appender.cmdstdout.layout.ConversionPattern=%m%n

#
# Rolling File Appender
#

#log4j.appender.RFA=org.apache.log4j.RollingFileAppender
#log4j.appender.RFA.File=${hadoop.log.dir}/${hadoop.log.file}

# Logfile size and and 30-day backups
#log4j.appender.RFA.MaxFileSize=1MB
#log4j.appender.RFA.MaxBackupIndex=30

#log4j.appender.RFA.layout=org.apache.log4j.PatternLayout
#log4j.appender.RFA.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} - %m%n
#log4j.appender.RFA.layout.ConversionPattern=%d{ISO8601} %-5p %c{2} (%F:%M(%L)) - %m%n

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