Log4j Format Specification: Difference between revisions
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{{External|http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout}} | {{External|http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout}} | ||
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 | 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]] | * [[#Literal_Text|literal text]] | ||
* [[#Conversion_Specifier|conversion specifiers]] | * [[#Conversion_Specifier|conversion specifiers]] | ||
Revision as of 17:44, 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).
Conversion Specifier
Format Modifier
A format modifier modifies how the data generated by the pattern layout element