LOG4J 开发笔记

1.下载log4j:

    apache-log4j-1.2.15.zip

 

2.unzip it and add log4j-1.2.15.jar into your classpath(java)

 

3.test file

 

 

java source code: Hello.java

 

import org.apache.log4j.Logger;
//import org.apache.log4j.BasicConfigurator;

import org.apache.log4j.PropertyConfigurator;
    
public class Hello {
    
   private static final Logger logger = Logger.getLogger("Minicore");
    
   public
   static
   void main(String argv[]) {
//     BasicConfigurator.configure();

    PropertyConfigurator.configure("log4j.property");
     logger.debug("Hello world.");
     logger.info("What a beatiful day.");
   }
}


 

property txt file: log4j.property

 

 

log4j.rootLogger=debug, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=example.log
log4j.appender.R.MaxFileSize= 100KB

# Keep one backup file
log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

 

4.test result:

 javac Hello.java

 java  Hello

 tail -F example.log

 

DEBUG main Minicore - Hello world.
      INFO main Minicore - What a beatiful day.
      DEBUG main Minicore - Hello world.
      INFO main Minicore - What a beatiful day.
      DEBUG main Minicore - Hello world.
      INFO main Minicore - What a beatiful day.
      DEBUG main Minicore - Hello world.
      INFO main Minicore - What a beatiful day.