log4j2: HTMLLayout: generate log message in HTML format

The HTMLLayout generates an HTML page and adds each LogEvent to a row in a table.

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp" packages="">
 <Appenders>
  <File name="my_file_appender" fileName="/Users/harikrishna_gurram/log.html">
   <HTMLLayout />
  </File>
 </Appenders>

 <Loggers>
  <Root level="info">
   <AppenderRef ref="my_file_appender" />
  </Root>
 </Loggers>
</Configuration>

package log4j_tutorial;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class HelloWorld {
 private static final Logger logger = LogManager.getLogger();

 public static void main(String args[]) throws InterruptedException {
  int val1 = 10, val2 = 11, val3 = 12;

  logger.trace("val1={}, val2={}, val3={}", val1, val2, val3);
  logger.debug("val1={}, val2={}, val3={}", val1, val2, val3);
  logger.info("val1={}, val2={}, val3={}", val1, val2, val3);
  logger.warn("val1={}, val2={}, val3={}", val1, val2, val3);
  logger.error("val1={}, val2={}, val3={}", val1, val2, val3);
  logger.fatal("val1={}, val2={}, val3={}", val1, val2, val3);

 }

}

Run HelloWorld application, you will get following kind of output.

Following are the HTML Layout Parameters.

Parameter	Type	Description
charset	String	The character set to use when converting the HTML String to a byte array. Default is UTF-8.
contentType	String	The value to assign to the Content-Type header. The default is "text/html".
locationInfo	boolean	Default value is false. If true, the filename and line number will be included in the HTML output. Generating location information is an expensive operation and may impact performance.
title	String	Specifies HTML title.

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