Now we can experiment and swap different logger implementations, but your application code can remain the same. All we need is to add slf4j-log4j with another popular logger implementation, such as the Log4j.
package com.javavillage.slf4j; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SLF4JSample { private static Logger LOGGER = LoggerFactory.getLogger(SLF4JSample.class); public static void main(String[] args) { LOGGER.info("Hi, Welcome to SLF4J exmaple"); } }for now I am adding below dependency for maven pom.xml
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.13</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.13</version> </dependency>log4j.properties
# Root logger option log4j.rootLogger=INFO, file, stdout # Direct log messages to stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p:: %m%n # Direct log messages to a log file log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=F:\\App\\javavillage.log log4j.appender.file.MaxFileSize=10000KB log4j.appender.file.MaxBackupIndex=10 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p:: %m%nproject structure after maven build.
Now you see logging output on STDOUT with INFO level..
2015-12-13 14:44:08 [main] INFO :: Hi, Welcome to SLF4J exmaple