Log4j Example On Using FileAppender And ConsoleAppender Simultaneously

Let us see how to use FileAppender and ConsoleAppender at a time.

Files Required

• Client.java
• log4j.properties
• my.txt [ We will let the appender to write into this file ]

Directory Structure

Client.java

import org.apache.log4j.Logger;

public class Client {

  static Logger l = Logger.getLogger(Client.class.getName());
 
  public static void main(String[] args) {          
      
      
      l.debug("This is debug message");
      l.info("This is info message");
      l.warn("This is warn message");
      l.fatal("This is fatal message");
      l.error("This is error message");
      
      System.out.println("Your logic executed successfully....");
      
  }
}

Once we run this client program, my.txt will contains….

log4j.properties

log4j.rootLogger=DEBUG,CONSOLE,LOGFILE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x – %m%n

log4j.appender.LOGFILE=org.apache.log4j.RollingFileAppender
log4j.appender.LOGFILE.File=my.txt
log4j.appender.LOGFILE.MaxFileSize=1kb
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=[%t] %-5p %c %d{dd/MM/yyyy HH:mm:ss} – %m%n

my.txt

[main] DEBUG Client 27/02/2012 21:39:15 – This is debug message
[main] INFO  Client 27/02/2012 21:39:15 – This is info message
[main] WARN  Client 27/02/2012 21:39:15 – This is warn message
[main] FATAL Client 27/02/2012 21:39:15 – This is fatal message
[main] ERROR Client 27/02/2012 21:39:15 – This is error message

Output In Eclipse Console

What you are thinkig....