Summary of methods used to print logs using log4j and previous old print log methods

1 According to reason the Commons-logging component has a method of printing logs, or a logging with Java, such as the following:

Importing logging jar packages is a must, and here are two ways to print the log

Package com.commons.logging;


Import Java.util.logging.Logger;

Import Org.apache.commons.logging.Log;
Import org.apache.commons.logging.LogFactory;

The public class Test {//Two print method results are similar to
	private static log log = Logfactory.getlog (Test.class); This is the log
	static Logger Logger = Logger.getlogger (Test.class.getName ()) in the Commons-logging component, or the Java self-contained log
	public void log ()
	{
		log.debug ("Debug Info.");
		Log.info ("info info");
		Log.warn ("Warn info");
		Log.error ("error info");
		Log.fatal ("Fatal info");
		System.out.println ();
		Logger.info ("Hello");
	}
	public static void Main (string[] args) {
		Test t = new Test ();
		T.log ();
	}

2 But the effect is not good, the General people do not use, the following print log

July 24, 2013 10:24:42 pm com.commons.logging.Test Log
info: Info info

July 24, 2013 10:24:42 pm com.commons.logging.Tes T log
Warning: Warn info
July 24, 2013 10:24:42 pm com.commons.logging.Test Log
serious: Error info
July 24, 2013 10:24: 42 pm Com.commons.logging.Test Log
serious: Fatal info
July 24, 2013 10:24:42 pm com.commons.logging.Test log
information: Hel Lo

3 these days are popular log4j, below look at the use of the log4j process:

1) Import jar Package log4j

2) Add log4j.properties under SRC

  Log4j.rootlogger=debug, stdout, R
  log4j.appender.stdout=org.apache.log4j.consoleappender
  Log4j.appender.stdout.layout=org.apache.log4j.patternlayout

  Log4j.appender.stdout.layout.ConversionPattern =%5p [%t] (%f:%l)-%m%n

  log4j.appender.r=org.apache.log4j.rollingfileappender
  log4j.appender.r.file= GridQualitSupervision.log
  log4j.appender.r.maxfilesize= 300KB

  log4j.appender.r.maxbackupindex=1

  Log4j.appender.r.layout=org.apache.log4j.patternlayout
  log4j.appender.r.layout.conversionpattern=%p%t%c-%m %n   

3) Simple test class

Package Com.wanju.common;

Import Org.apache.log4j.Logger;


public class Loggerutil {public

	static Logger Logger = Logger.getlogger (LoggerUtil.class.getName ());
	
	public static void Main (string[] args) {
		logger.info ("OK");
	}

4) View Test results

INFO [main] (loggerutil.java:11)-OK

It's so simple, it's so cool