Java之Logger日志（Java8特性）

import java.util.logging.Level;
import java.util.logging.Logger;

public class LoggingDemo {
    public static final Logger logger = Logger.getLogger("LoggingDemo.class");

    public static void main(String args[]) {
        Level level = Level.parse("FINEST");
        logger.info(level.toString());

        //下面的消息将被输出
        logger.setLevel(level);
        logger.info("this is an info");
        logger.warning("this is a warn");
        logger.severe("this is a severe");
//        logger.config("config");
//        logger.fine("fine");
//        logger.finer("finer");
//        logger.finest("finest");

        logger.info("LoggerName: " + logger.getName());
        logger.info("LoggerLevelName: " + logger.getLevel().getName());

    }
}

运行结果：

五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
信息: FINEST
五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
信息: this is an info
五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
警告: this is a warn
五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
严重: this is a severe
五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
信息: LoggerName: LoggingDemo.class
五月 23, 2018 5:13:24 下午 org.study2.java8.logging.LoggingDemo main
信息: LoggerLevelName: FINEST