Logger java

Logger class

import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

public class TestLogger {
 public static void main(String args[]) {

  try {
   // 2012-11-08 10:01:32 TestLogger main\nWARNING: Some problem
   Formatter formatter = new SimpleFormatter();

   // 2012-11-08 10:14:42 WARNING: TestLogger.main Some problem
   // Formatter formatter = new MyFormatter();   

   // boolean flag specifies append mode
   Handler handler = new FileHandler("MyLogFile.log", true);
   handler.setFormatter(formatter);

   Logger logger = Logger.getLogger("MyLoggerName");
   logger.addHandler(handler);
   // Message with level lower will be discarded
   logger.setLevel(Level.ALL);

   // Log a message
   logger.log(Level.WARNING, "Some problem");

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

Formatter implementation which formats messages

import java.text.DateFormat;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;

/**
 * Class formats a record to:
 2012-11-08 10:14:42 WARNING: TestLogger.main
 * Some problem occurred
 * 
 */
public class MyFormatter extends Formatter {

 @Override
 public String format(LogRecord record) {

  StringBuffer sb = new StringBuffer();

  sb.append(DateFormat.getDateTimeInstance(DateFormat.MEDIUM,
  DateFormat.MEDIUM).format(new Date())).append(" ")
  .append(record.getLevel()).append(": ")
  .append(record.getSourceClassName()).append(".")
  .append(record.getSourceMethodName()).append(" ")
  .append(record.getMessage()).append("\n");

   return sb.toString();
 }
}

SimpleDataFormat patterns to format dates (instead of DateFormat.getDateTimeInstance())

import java.text.SimpleDateFormat;
import java.util.Date;

public class TestSimpleDateFormat {
 public static void main(String[] args) {

  // 20121108114353
  String pattern1 = "yyyyMMddhhmmss"; 
  // [20121108-114224]
  String pattern2 = "[yyyyMMdd-hhmmss]"; 
  // 2012-11-08 11:42:32
  String pattern3 = "yyyy-MM-dd hh:mm:ss";
  // 2012-11-08-11:42:42.949 
  String pattern4 = "yyyy-MM-dd-hh:mm:ss.S"; 

  SimpleDateFormat df = new SimpleDateFormat(pattern1);
  // df.applyPattern(pattern);
  System.out.println(df.format(new Date()));
 }
}