Java by API/java.util.logging/FileHandler

FileHandler: close()

  

import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;
import java.util.logging.XMLFormatter;
public class Main {
  public static void main(String args[]) throws Exception {
      LogManager lm = LogManager.getLogManager();
      Logger logger;
      FileHandler fh = new FileHandler("log_test.txt");
      logger = Logger.getLogger("LoggingExample1");
      lm.addLogger(logger);
      logger.setLevel(Level.INFO);
      fh.setFormatter(new XMLFormatter());
      logger.addHandler(fh);
       //logger.setUseParentHandlers(false);
      logger.log(Level.INFO, "test 1");
      logger.log(Level.INFO, "test 2");
      logger.log(Level.INFO, "test 3");
      fh.close();
  }
}

FileHandler: publish(LogRecord record)

  
import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.XMLFormatter;
public class Main {
  public static void main(String args[]) throws Exception{
    XMLFormatter formatter = new XMLFormatter();
    LogRecord record = new LogRecord(Level.INFO, "XML message..");
    FileHandler handler = new FileHandler("newxml.xml");
    handler.setFormatter(formatter);
    handler.publish(record);
    handler.flush();
  }
}

new FileHandler(String pattern)

 
import java.io.IOException;
import java.util.logging.ConsoleHandler;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Logger;
import java.util.logging.XMLFormatter;
public class MainClass {
  public static void main(String args[]) {
    Logger logger = Logger.getLogger("my.log");
    Handler handler = null;
    try {
      handler = new FileHandler("messages.log");
    } catch (IOException e) {
      System.out.println("Could not create file. Using the console handler");
      handler = new ConsoleHandler();
    }
    logger.addHandler(handler);
    handler.setFormatter(new XMLFormatter());
    logger.info("Our first logging message");
    logger.severe("Something terrible happened");
  }
}