Home Java Example Java Util Creating a Custom Formatter for a Logger Handler in Java

Creating a Custom Formatter for a Logger Handler in Java
Posted on: February 22, 2008 at 12:00 AM

This section tells you how to create a custom formatter for a logger handler. Java provides two types formatter SimpleFormatter and XMLFormatter.

Creating a Custom Formatter for a Logger Handler in Java

This section tells you how to create a custom formatter for a logger handler. Java provides two types formatter SimpleFormatter and XMLFormatter. But, the java logging package allows for creating a custom formatter through the logger handler. Here you will see custom formatter that means formatter is created by users or user defined formatter. A logger handler writes log records to another file by using the logger formatter.

Descriptions of program:

Program creates a logger and writes logger records to given file in FileHandler that has append property is true to add content into last of file. Contents are adding into a file to given format in custom formatter. Here, formatter provides the facility to write date into file in 'heading 1' format.

Description of code:

getHead(Handler h):
Above is a method of Formatter class that returns string types formatter records. This method takes a argument which is any type of handler.

Here is the code of program:


import java.io.*;

import java.util.*;

import java.util.logging.*;



public class CustomFormatter extends XMLFormatter{

  public static void main(String[] args) {

  Logger log = Logger.getLogger("RoseIndia.Net");

  try{

  FileHandler hand = new FileHandler("vinod.html", true);

  hand.setFormatter(new CustomFormatter());

  log.addHandler(hand);

  log.info("The Custom formatter is created by RoseIndia.Net");

  }

  catch (IOException e){}

  }

  public String format(LogRecord rec) {

  StringBuffer buf = new StringBuffer(1000);

  buf.append(formatMessage(rec));

  return buf.toString();

  }

 public String getHead(Handler h) {

  return "<HTML><HEAD><h1>"+(new Date())+"</h1></HEAD><BODY>\n";

 }

}

Download this example.

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