log4j 按月，周，半天，天，小时，分钟滚动日志配置

本文备忘用，下面大部分引用log4j原文,也掺杂着我增加的示例。也方便大家学习参考。

 

log4j is possible to specify monthly, weekly, half-daily, daily, hourly, or minutely rollover schedules.

For example,

log4j.appender.fileout=org.apache.log4j.DailyRollingFileAppender
log4j.appender.fileout.File=./logs/programdolt.log
#log4j.appender.fileout.DatePattern='.'yyyy-MM-dd
log4j.appender.fileout.DatePattern='.'yyyy-MM-dd-HH-mm

 

org.apache.log4j
Class DailyRollingFileAppender
java.lang.Object
   org.apache.log4j.AppenderSkeleton
       org.apache.log4j.WriterAppender
           org.apache.log4j.FileAppender
               org.apache.log4j.DailyRollingFileAppender
All Implemented Interfaces:
Appender, OptionHandler 

 

________________________________________

public class DailyRollingFileAppender
extends FileAppender

 

DailyRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency.

The rolling schedule is specified by the DatePattern option. This pattern should follow the SimpleDateFormat conventions. In particular, you must escape literal text within a pair of single quotes. A formatted version of the date pattern is used as the suffix for the rolled file name.

For example, if the File option is set to /foo/bar.log and the DatePattern set to '.'yyyy-MM-dd , on 2001-02-16 at midnight, the logging file /foo/bar.log will be copied to /foo/bar.log.2001-02-16 and logging for 2001-02-17 will continue in /foo/bar.log until it rolls over the next day.

Is is possible to specify monthly, weekly, half-daily, daily, hourly, or minutely rollover schedules.

DatePattern	Rollover schedule	Example
'.'yyyy-MM	Rollover at the beginning of each month	At midnight of May 31st, 2002 /foo/bar.log will be copied to /foo/bar.log.2002-05 . Logging for the month of June will be output to /foo/bar.log until it is also rolled over the next month.
'.'yyyy-ww	Rollover at the first day of each week. The first day of the week depends on the locale.	Assuming the first day of the week is Sunday, on Saturday midnight, June 9th 2002, the file /foo/bar.log will be copied to /foo/bar.log.2002-23 . Logging for the 24th week of 2002 will be output to /foo/bar.log until it is rolled over the next week.
'.'yyyy-MM-dd	Rollover at midnight each day.	At midnight, on March 8th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-08 . Logging for the 9th day of March will be output to /foo/bar.log until it is rolled over the next day.
'.'yyyy-MM-dd-a	Rollover at midnight and midday of each day.	At noon, on March 9th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-09-AM . Logging for the afternoon of the 9th will be output to /foo/bar.log until it is rolled over at midnight.
'.'yyyy-MM-dd-HH	Rollover at the top of every hour.	At approximately 11:00.000 o'clock on March 9th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-09-10 . Logging for the 11th hour of the 9th of March will be output to /foo/bar.log until it is rolled over at the beginning of the next hour.
'.'yyyy-MM-dd-HH-mm	Rollover at the beginning of every minute.	At approximately 11:23,000, on March 9th, 2001, /foo/bar.log will be copied to /foo/bar.log.2001-03-09-10-22 . Logging for the minute of 11:23 (9th of March) will be output to /foo/bar.log until it is rolled over the next minute.

Do not use the colon ":" character in anywhere in the DatePattern option. The text before the colon is interpeted as the protocol specificaion of a URL which is probably not what you want.