问题
I want to add microseconds in the timestamp of each entry of my log files generated with log4j, is it possible ?
I have searched in the official documentation but there are no mention of unit below the milliseconds.
Now i have a conversion pattern like the following :
%d{dd/MM/yyyy HH\:mm\:ss,SSS} %-5p [%t] - %m%n
in the date conversion pattern(%d) i want to add microseconds after the milliseconds value(SSS), is there a way to do it ?
回答1:
If you want to display micro-seconds, you need to add this yourself. This could be done with a custom Formatter (instead of PatternFormatter)
回答2:
Starting from Java 9 and log4j 2.11.0, it is possible to get the timestamp even with nanoseconds.
Here are the special predefined patterns allowing to get a date time or a time with microseconds or nanoseconds:
- Pattern:
%d{ABSOLUTE_MICROS}Example of output:14:34:02,123456 - Pattern:
%d{ABSOLUTE_NANOS}Example of output:14:34:02,123456789 - Pattern:
%d{DEFAULT_MICROS}Example of output:2012-11-02 14:34:02,123456 - Pattern:
%d{DEFAULT_NANOS}Example of output:2012-11-02 14:34:02,123456789
If you need a more specific pattern use the "nano-of-second" pattern letter n instead of the "fraction-of-second" pattern letter S for example %d{dd MMM yyyy HH:mm:ss,nnnn} to %d{dd MMM yyyy HH:mm:ss,nnnnnnnnn} will give 02 Nov 2012 14:34:02,1234 to 02 Nov 2012 14:34:02,123456789.
In your case, as you need milliseconds and microseconds, your pattern could be something like %d{dd/MM/yyyy HH:mm:ss,nnnnnn}
Log4j 2.11 adds limited support for timestamps more precise than milliseconds when running on Java 9.
For more details please refer to https://logging.apache.org/log4j/2.x/manual/layouts.html
回答3:
it is based on SimpleDateFormat and that does not support sub-millisecond formats, so microseconds can not be reported.
来源：https://stackoverflow.com/questions/8376488/log4j-conversionpattern-timestamp-with-microseconds