log4j

log4j

Main.java

package test;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.xml.XmlConfigurationFactory;

public class Main {
	public static void main(String[] args) {
		System.setProperty(XmlConfigurationFactory.CONFIGURATION_FILE_PROPERTY, "log4j2.xml");
		
		Logger logger = LogManager.getLogger(Main.class);
		logger.trace("TRACEレベルのログ");
		logger.debug("DEBUGレベルのログ");
		logger.info("INFOレベルのログ");
		logger.warn("WARNレベルのログ");
		logger.error("ERRORレベルのログ");
		

		if (args.length != 2) {
			logger.error("起動引数の数が異常：" + args.length);
		}
	}

}

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
	<Appenders>
		<Console name="Console" target="SYSTEM_OUT">
			<PatternLayout
				pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
		</Console>
	</Appenders>
	<Loggers>
		<Root level="trace">
			<AppenderRef ref="Console" />
		</Root>
	</Loggers>
</Configuration>