入门log4j2

1.引入依赖包

          <dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.0-beta9</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.0-beta9</version>
</dependency>

2.配置文件classpath: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>
<File name="A1" fileName="logs/A1.log" append="true">
<PatternLayout pattern="%d{HH:mm:ss.SSS} %t %-5p %c{2} - %m%n" />
</File>
</Appenders>
<Loggers>
<logger name="sin.wolf.lang" level="TRACE">
<AppenderRef ref="A1" />
</logger>
<Root level="debug">
<AppenderRef ref="Console" />
</Root>
</Loggers>
</Configuration>

3.测试代码

  public class Log {

static Logger logger = LogManager.getLogger(Log.class.getName());

public static void main(String argv[]) throws Exception {
System.out.println(logger);
logger.debug("Entering application.");
logger.error("Didn't do it.");
logger.error("Exiting application.");
}
}