The B / S structural system we developed, which generally has a daily run log record. When saving a log file form, you will often encounter a problem: the log file is too large. It is also a problem for the online log information for receiving log information. So I hope to produce a log file every day or every month, so the file is not too big. Or determine based on the log file size, exceeding the specified size, the log is automatically added to the new file.
The implementation of these two ways in log4j is very simple, as long as it is set in the configuration file.
First, generate log files at a certain time, the configuration file is as follows:
# Set root logger level to error and its Only appender to a1.
Log4j.rootlogger = error, r
# R IS set to be a dailyrollingfileappender.
Log4j.Appender.r = org.apache.log4j.dailyRollingFileAppender
Log4j.Appender.r.file = backup.log
Log4j.Appender.r.datepattern = '.'yyy-mm-dd
Log4j.Appender.r.Layout = org.apache.log4j.patternlayout
Log4j.rapnder.r.Layout.ConversionPattern =% - D {yyyy-mm-dd hh: mm: ss} [% C] - [% P]% m% N
The above configuration is to generate a backup file every day. The name of the backup file is Backup.log.
The specific effect is this: The log information on the same day is recorded in the backup.log file, the previous day record in the file named backup.log.log.yleyy-mm-dd.
Similarly, if you need a file per month to modify the above configuration:
will
Log4j.Appender.r.datepattern = '.'yyy-mm-dd
Change to
Log4j.Appender.r.datepattern = '.'yyyy-mm
Second, automatically generate a new log file according to the log file size
The configuration file content is as follows:
# Set root logger level to error and its Only appender to a1.
Log4j.rootlogger = error, r
# R is set to be a rollingfileappender.
Log4j.Appender.r = org.apache.log4j.rollingfileappender
Log4j.Appender.r.file = backup.log
# log4j.appender.r.maxfilesize = 100kb
# Keep One Backup File
Log4j.Appender.r.maxbackupindex = 1
Log4j.Appender.r.Layout = org.apache.log4j.patternlayout
Log4j.rapnder.r.Layout.ConversionPattern =% - D {yyyy-mm-dd hh: mm: ss} [% C] - [% P]% m% N
among them:
#
Log file size
Log4j.Appender.r.maxfilesize = 100kb #
Save a backup file
Log4j.Appender.r.maxbackupindex = 1
