LOG4J PATTERN FORMATS | LOG4J格式输出说明

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.