1.Log4j will inspect the "log4j.configurationFile" system property and, if set, will attempt to load the configuration using the ConfigurationFactory that matches the file extension.
2.If no system property is set the YAML ConfigurationFactory will look for log4j2-test.yaml or log4j2-test.yml in the classpath.
3.If no such file is found the JSON ConfigurationFactory will look for log4j2-test.json or log4j2-test.jsn in the classpath.
4.If no such file is found the XML ConfigurationFactory will look for log4j2-test.xml in the classpath.
5.If a test file cannot be located the YAML ConfigurationFactory will look for log4j2.yaml or log4j2.yml on the classpath.
6.If a YAML file cannot be located the JSON ConfigurationFactory will look for log4j2.json or log4j2.jsn on the classpath.
7.If a JSON file cannot be located the XML ConfigurationFactory will try to locate log4j2.xml on the classpath.
8.If no configuration file could be located the DefaultConfiguration will be used. This will cause logging output to go to the console.

name = PropertiesConfig
property.filename = target/logs

#appenders = console, file
#配置值是appender的类型，并不是具体appender实例的name
appenders = rolling

appender.rolling.type = RollingFile
appender.rolling.name = RollingLogFile
appender.rolling.fileName=${filename}/automationlogs.log
appender.rolling.filePattern = ${filename}/automationlogs-%d{MM-dd-yy-HH-mm-ss}-%i.log
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
appender.rolling.policies.type = Policies
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 5
 
rootLogger.level = trace
rootLogger.appenderRef.rolling.ref = rolling
rootLogger.appenderRef.rolling.ref = RollingLogFile