java.util.logging 實用例子

java.util.logging 例子

2016-04-20 景峯  Netkiller

Logging

java.util.logging

import java.util.logging.*; public class Main {    public static void main(String[] args) {
        Logger log = Logger.getLogger("test"); 
        log.setLevel(Level.INFO); 
        log.info("--------------------------");
        log.info("Test");
        log.info("--------------------------");

    }
}

　ＸＭＬ

import java.io.IOException; import java.util.logging.*; public class Main {    public static void main(String[] args) {        try {
            Logger log = Logger.getLogger("test");
            FileHandler fileHandler = new FileHandler("test.%g.log");
            fileHandler.setLevel(Level.INFO);
            log.addHandler(fileHandler);

            log.setLevel(Level.INFO);
            log.info("One");
            log.info("Two");
            log.info("Three");

        } catch (SecurityException e) {            // TODO Auto-generated catch block            e.printStackTrace();
        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();
        }

    }
}

輸出結果

<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE log SYSTEM "logger.dtd"><log><record>  <date>2016-04-19T15:57:19</date>  <millis>1461052639360</millis>  <sequence>0</sequence>  <logger>test</logger>  <level>INFO</level>  <class>Main</class>  <method>main</method>  <thread>1</thread>  <message>One</message></record><record>  <date>2016-04-19T15:57:19</date>  <millis>1461052639394</millis>  <sequence>1</sequence>  <logger>test</logger>  <level>INFO</level>  <class>Main</class>  <method>main</method>  <thread>1</thread>  <message>Two</message></record><record>  <date>2016-04-19T15:57:19</date>  <millis>1461052639395</millis>  <sequence>2</sequence>  <logger>test</logger>  <level>INFO</level>  <class>Main</class>  <method>main</method>  <thread>1</thread>  <message>Three</message></record></log>

Formatter

import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.logging.*; class LogFormatter extends Formatter {    @Override    public String format(LogRecord record) {        return String.format("%s %s\t%s\n", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date()) , record.getLevel(), record.getMessage());
    }
}public class Main {    public static void main(String[] args) {        try {
            Logger log = Logger.getLogger("test");
            FileHandler fileHandler = new FileHandler("test.%g.log");
            fileHandler.setLevel(Level.INFO);
            log.addHandler(fileHandler);
            fileHandler.setFormatter(new LogFormatter());
            log.setLevel(Level.INFO);
            log.info("One");
            log.info("Two");
            log.info("Three");

        } catch (SecurityException e) {            // TODO Auto-generated catch block            e.printStackTrace();
        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();
        }

    }
}

輸出結果

2016-04-19 16:05:53.324 INFO    One
2016-04-19 16:05:53.352 INFO    Two
2016-04-19 16:05:53.353 INFO    Three