log4j.xml Example
In earlier example you have seen that we can define
properties of log4j logging file with the help of log4j.properties. Properties
can also be defined within log4j.xml file. You have to add following
contents to this XML file.
log4j.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
<log4j:configuration>
<appender name="stdout" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{ABSOLUTE}
%5p %c{1}:%L - %m%n"/>
</layout>
</appender>
<root>
<priority value="debug"></priority>
<appender-ref ref="stdout"/>
</root>
</log4j:configuration>
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Log4j looks for log4j.xml file first and then go for
log4j.properties hence you must place both the files in your folder. We use
log4j.xml since properties file does not provide some advanced configuration
options such as Filter, some of ErrorHandlers, and few advanced Appenders.
log4j.properties
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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{ABSOLUTE}
%5p %c{1}:%L
- %m%n
log4j.rootLogger=debug, stdout |
Here is our SimpleLog class code:
SimpleLog.java
import org.apache.log4j.*;
public class SimpleLog {
static Logger logger = Logger.getLogger("SimpleLog.class");
public static void main(String[] args) {
logger.debug("Welcome to Log4j");
}
}
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Output:
| 13:07:40,875 DEBUG
class:5 - Welcome to Log4j |
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