Log4j Format Specification: Difference between revisions
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==Conversion Specifier== | ==Conversion Specifier== | ||
Each ''conversion specifier'' starts with a percent sign ('%') and it is followed by an optional [[#Format_Modifier|format modifier]] and a ''[[#Conversion_Character|conversion character]]''. | Each ''conversion specifier'' starts with a percent sign ('%') and it is followed by an optional [[#Format_Modifier|format modifier]] and a mandatory ''[[#Conversion_Character|conversion character]]''. | ||
==Format Modifier== | ==Format Modifier== | ||
Revision as of 17:52, 15 November 2017
External
Internal
Overview
log4j calls its output format layout. Most commonly used is the pattern layout.
Pattern Layout
The pattern layout is defined by a conversion pattern string, where various element of a log event can be referred and the way they are intended to be displayed in a log file specified. The conversion pattern is closely related to the conversion pattern of the printf function in C. The conversion pattern is composed of:
Literal Text
Literal text may include special characters (\t, \n \r \f). '\\' can be used to insert a backslash in the output.
Conversion Specifier
Each conversion specifier starts with a percent sign ('%') and it is followed by an optional format modifier and a mandatory conversion character.
Format Modifier
A format modifier modifies how the data generated by the pattern layout element