Log4j Format Specification: Difference between revisions
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The pattern layout is defined by a ''pattern string'', where various element of a log event can be specified and the way they are intended to be displayed in a log file described. The format of the result depends on the ''conversion pattern'', which 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 ''pattern string'', where various element of a log event can be specified and the way they are intended to be displayed in a log file described. The format of the result depends on the ''conversion pattern'', which 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]] | ||
* [[#Conversion_Specifier|conversion specifiers]] | |||
==Literal Text== | |||
Literal text may include special characters (\t, \n \r \f). | |||
==Conversion Specifier== | |||
==Format Modifier== | ==Format Modifier== | ||
A ''format modifier'' modifies how the data generated by the pattern layout element | A ''format modifier'' modifies how the data generated by the pattern layout element | ||
Revision as of 17:41, 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 pattern string, where various element of a log event can be specified and the way they are intended to be displayed in a log file described. The format of the result depends on the conversion pattern, which 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