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("--------------------------");
}
}
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();
}
}
}
<?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>
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();
}
}
}
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