log4j.appender.RollingFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.RollingFile.File=/data/log/ott-solr-provider/stdout.log
log4j.appender.RollingFile.File.DatePattern=.yyyy-MM-dd
log4j.appender.RollingFile.layout=org.apache.log4j.PatternLayout
log4j.appender.RollingFile.layout.ConversionPattern=[%d{yyyy/MM/dd HH:mm:ss,SSS}][%-5p] - %l:%m%n
log4j.appender.RollingFile.encoding=UTF-8
原文：http://my.oschina.net/gaowm/blog/411062