log4j 2使用properties文件进行配置

网上不少文章给的都是用xml进行配置，也会提到无法使用properties文件对log4j进行配置，但那应该只是在他们写文章的时候才是如此，最新的2.8.2版本经过我试验后是可以做到的当然该文件最好放在特定的目录中才行，官方文档也提到了

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