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|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: | The pattern layout is defined by a [[#Conversion_Pattern|conversion pattern]] string. | ||
==Conversion Pattern== | |||
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]] | ||
===Literal Text=== | ===Literal Text=== | ||
Revision as of 18:00, 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.
Conversion Pattern
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
Conversion Character
The conversion character specifies the type of data (category, priority, date, thread name, etc)