先说一下按日期产生，不解释，大家都懂，这种方法的缺点就是很吃硬盘空间
log4j.rootLogger=INFO,logfile,stdout log4j.logger.java.sql=DEBUG,sqllog
#log4j.additivity.java.sql=false
#velocity print out
log4j.logger.org.apache.velocity=ERROR,velocityfile
log4j.additivity.org.apache.velocity=false
log4j.logger.org.springframework.web.servlet.mvc.annotation=false
#app print out
log4j.logger.com.hundsun.network=DEBUG
log4j.logger.com.hundsun.network.melody.common.profiler=DEBUG,profiler
log4j.additivity.com.hundsun.network.melody.common.profiler=false #standout log appender #
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n #common log appender #
log4j.appender.logfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.logfile.File=/WEB-INF/log/app.log
log4j.appender.logfile.append=true
log4j.appender.logfile.encoding=GB18030
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n #error log appender #
log4j.appender.errorfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorfile.File=/WEB-INF/log/error.log
log4j.appender.errorfile.Threshold=ERROR
log4j.appender.errorfile.append=true
log4j.appender.errorfile.encoding=GB18030
log4j.appender.errorfile.layout=org.apache.log4j.PatternLayout
log4j.appender.errorfile.layout.ConversionPattern=%d %p [%c] - %m%n #sql log appender #
log4j.appender.sqllog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.sqllog.File=/WEB-INF/log/sql.log
log4j.appender.sqllog.append=true
log4j.appender.sqllog.encoding=GB18030
log4j.appender.sqllog.layout=org.apache.log4j.PatternLayout
log4j.appender.sqllog.layout.ConversionPattern=%d %p [%c] - %m%n #velocity log appender #
log4j.appender.velocityfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.velocityfile.File=/WEB-INF/log/velocity.log
log4j.appender.velocityfile.append=true
log4j.appender.velocityfile.encoding=GB18030
log4j.appender.velocityfile.layout=org.apache.log4j.PatternLayout
log4j.appender.velocityfile.layout.ConversionPattern=%d %p [%c] - %m%n #profile appender #
log4j.appender.profiler=org.apache.log4j.DailyRollingFileAppender
log4j.appender.profiler.File=/WEB-INF/log/profler.log
log4j.appender.profiler.append=true
log4j.appender.profiler.encoding=GB18030
log4j.appender.profiler.layout=org.apache.log4j.PatternLayout
log4j.appender.profiler.layout.ConversionPattern=%d %p [%c] - %m%n
于是我们来解决一下这个问题，把日志的大小限在10240Ｋ,一共只许生成30个，循环覆盖
log4j.rootLogger=INFO,logfile,stdout,errorfile log4j.logger.java.sql=@log.level@,sqllog
log4j.additivity.java.sql=false
#velocity print out
log4j.logger.org.apache.velocity=ERROR,velocityfile
log4j.additivity.org.apache.velocity=false
#app print out
log4j.logger.com.hundsun.network=DEBUG
log4j.logger.com.hundsun.network.melody.common.profiler=@log.level@,profiler
log4j.additivity.com.hundsun.network.melody.common.profiler=false #standout log appender #
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n #common log appender #
log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=/WEB-INF/log/app.log
log4j.appender.logfile.append=true
log4j.appender.logfile.encoding=GB18030
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile.MaxFileSize=10240KB
log4j.appender.logfile.MaxBackupIndex=30
#error log appender #
log4j.appender.errorfile=org.apache.log4j.RollingFileAppender
log4j.appender.errorfile.File=/WEB-INF/log/error.log
log4j.appender.errorfile.Threshold=ERROR
log4j.appender.errorfile.append=true
log4j.appender.errorfile.encoding=GB18030
log4j.appender.errorfile.layout=org.apache.log4j.PatternLayout
log4j.appender.errorfile.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.errorfile.MaxFileSize=10240KB
log4j.appender.errorfile.MaxBackupIndex=30
#sql log appender #
log4j.appender.sqllog=org.apache.log4j.RollingFileAppender
log4j.appender.sqllog.File=/WEB-INF/log/sql.log
log4j.appender.sqllog.append=true
log4j.appender.sqllog.encoding=GB18030
log4j.appender.sqllog.layout=org.apache.log4j.PatternLayout
log4j.appender.sqllog.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.sqllog.MaxFileSize=10240KB
log4j.appender.sqllog.MaxBackupIndex=30 #velocity log appender #
log4j.appender.velocityfile=org.apache.log4j.RollingFileAppender
log4j.appender.velocityfile.File=/WEB-INF/log/velocity.log
log4j.appender.velocityfile.append=true
log4j.appender.velocityfile.encoding=GB18030
log4j.appender.velocityfile.layout=org.apache.log4j.PatternLayout
log4j.appender.velocityfile.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.velocityfile.MaxFileSize=10240KB
log4j.appender.velocityfile.MaxBackupIndex=30
#profile appender #
log4j.appender.profiler=org.apache.log4j.RollingFileAppender
log4j.appender.profiler.File=/WEB-INF/log/profler.log
log4j.appender.profiler.append=true
log4j.appender.profiler.encoding=GB18030
log4j.appender.profiler.layout=org.apache.log4j.PatternLayout
log4j.appender.profiler.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.profiler.MaxFileSize=10240KB
log4j.appender.profiler.MaxBackupIndex=30