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