LOG4J PATTERN FORMATS | LOG4J格式输出说明

最新推荐文章于 2025-01-17 16:18:43 发布

转载最新推荐文章于 2025-01-17 16:18:43 发布 · 706 阅读

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#log4j #newline #components #java #performance #nested

本文详细介绍了Log4j配置文件中日志输出格式的各项参数及其含义，帮助开发者更好地理解并设置日志记录格式。

在LOG4J的配置文件中,log4j.appender.CATNAME.layout.ConversionPattern项中可配置日志输出格式.其中格式符代表的意义如下 .

     %n   -   newline
     %m -   your   log   message
     %p   -   message   priority   (FATAL,   ERROR,   WARN,   INFO,   DEBUG   or   custom)
     %r   -   millisecs   since   program   started   running
     %%   -   percent   sign   in   output

-----------------------SOME   MORE   CLUTTER   IN   YOUR   LOG-------------------------
     %c   -   name   of   your   category   (logger),   %c{2}   will   outputs   last   two   components
     %t   -   name   of   current   thread
     %x   -   Nested   Diagnostic   Context   (NDC)   (you   supply   it)

-------------------------SLOW   PERFORMANCE   FORMATS----------------------------
     %d   -   date   and   time,   also   %d{ISO8601},   %d{DATE},   %d{ABSOLUTE},
                   %d{HH:mm:ss,SSS},   %d{dd   MMM   yyyy   HH:mm:ss,SSS}   and   so   on
     %l   -   Shortcut   for   %F%L%C%M
     %F   -   Java   source   file   name
     %L   -   Java   source   line   number
     %C   -   Java   class   name,   %C{1}   will   output   the   last   one   component
     %M   -   Java   method   name

------------------------------FORMAT   MODIFIERS-------------------------------
     %-any_letter_above   -   Left-justify   in   min.   width   (default   is   right-justify)
     %20any_letter_above -   20   char.   min.   width   (pad   with   spaces   if   reqd.)
     %.30any_letter_above -   30   char.   max.   width   (truncate   beginning   if   reqd.)
     %-10.10r   -   Example.     Left-justify   time   elapsed   within   10-wide   field.
                               Truncate   from   beginning   if   wider   than   10   characters.