Brief analysis of log4j source code | Reading configuration Files

Logmanager during initialization, reads the value of the log4j.configuration system variable, generates the URL of the configuration file, The default is Log4j.properties or Log4j.xml. Then use the Propertyconfigurator class to parse the Log4j.properties file.

Read the source to understand that the Propertyconfigurator class implemented the Configurator interface, overloaded the Configure method to read the properties file, and then through the overload Doconfigure method to assemble the logger properties.

The specific source code please refer to Log4j/logging-log4j-1.2.13/src/java/org/apache/log4j/propertyconfigurator.java.

The Log4j.xml file is parsed by the Domconfigurator.java class.

The specific source code refer to Log4j/logging-log4j-1.2.13/src/java/org/apache/log4j/xml/domconfigurator.java