Log4j file appender

✔ LOG4J CHAPTERS:-

1. Log4j Overview
2. Log4j Logger Class
3. Log4j Example
4. Log4j Example using Log4j Properties
5. Log4j Example using Log4j xml File
6. Logging Levels in Log4j
7. Log4j File Appender
8. Log4j Multiple Appenders Example
9. Log4j Tutorials PDF Download
9. Log4j Interview Questions & Answers

Let us discuss the use of file appenders with the help of below example.

Example:

Log4jTest.java

import org.apache.log4j.Logger;   /** * This class is used to show the use of * file appender with the log4j.properties file. * @author javawithease */ public class Log4jTest { //Get the Logger object. private static Logger log = Logger.getLogger(Log4jTest.class);   public static void main(String[] args) { //logger messages log.debug("Log4j debug message test."); log.info("Log4j info message test."); log.warn("Log4j warn message test."); log.error("Log4j error message test."); log.fatal("Log4j fatal message test."); } }

log4j.properties

#log4j.rootCategory=INFO,DEBUG,A1,LFS,FA,CA log4j.rootLogger=DEBUG, FA   #Set File Appender log4j.appender.FA=org.apache.log4j.FileAppender log4j.appender.FA.File=test.log #Set FA Layout log4j.appender.FA.layout=org.apache.log4j.PatternLayout log4j.appender.FA.layout.ConversionPattern=%m%n

Output:

Log4j debug message test. Log4j info message test. Log4j warn message test. Log4j error message test. Log4j fatal message test.