java.util.logging

最新推荐文章于 2021-12-24 18:30:31 发布

转载最新推荐文章于 2021-12-24 18:30:31 发布 · 379 阅读

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本文介绍了一个使用 Java Log4j 进行日志记录的具体示例。包括了如何配置 Logger 来记录不同级别的日志信息，并且演示了如何将日志输出到控制台和文件中。

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http://lishumingwm163-com.iteye.com/blog/1888756

http://lavasoft.blog.51cto.com/62575/184492/

public class log4jDemo {
    private static Logger logger = logUtil.getLogger(log4jDemo.class.getName());

    public static void main(String argv[]) {
        // Log a FINEtracing message
        logger.info("Main running.");
        logger.fine("doingstuff");
        try {
            Thread.currentThread().sleep(1000);// do some work
        } catch(Exception ex) {
            logger.log(Level.WARNING,"trouble sneezing", ex);
        }
        logger.fine("done");
    }
}

public class logUtil {
    public static void main(){



        Logger log2 = Logger.getLogger("lavasoft.blog");
//                log2.setLevel(Level.WARNING);

        ConsoleHandler consoleHandler = new ConsoleHandler();
        consoleHandler.setLevel(Level.ALL);
        log2.addHandler(consoleHandler);
        FileHandler fileHandler = null;
        try {
            fileHandler = new FileHandler("C:/testlog%g.log");
        } catch (IOException e) {
            e.printStackTrace();
        }
        fileHandler.setLevel(Level.INFO);
        fileHandler.setFormatter(new MyLogHander());
        log2.addHandler(fileHandler);

        log2.info("aaa");
        log2.info("bbb");
        log2.fine("fine");
    }

    public static Logger getLogger(String name) {


        Logger log2 = Logger.getLogger(name);
           log2.setLevel(Level.INFO);

        ConsoleHandler consoleHandler = new ConsoleHandler();
        consoleHandler.setLevel(Level.ALL);
        log2.addHandler(consoleHandler);
        FileHandler fileHandler = null;
        try {
            fileHandler = new FileHandler("D://aa.log");
        } catch (IOException e) {
            e.printStackTrace();
        }
        fileHandler.setLevel(Level.INFO);
        fileHandler.setFormatter(new MyLogHander());
        log2.addHandler(fileHandler);

       return log2;
    }


}
class MyLogHander extends Formatter {
    @Override
    public String format(LogRecord record) {
        return record.getLevel() + ":" + record.getMessage()+"\n";
    }
}