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Setting the Formatter of a Logger Handler in Java

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This section discussed how to set the formatter of a logger handler. Java provides a logger handler that uses a formatter for writing log records for a log file that can be either xml file or other.

Setting the Formatter of a Logger Handler in Java

     

This section discussed how to set the formatter of a logger handler. Java provides a logger handler that uses a formatter for writing log records for a log file that can be either xml file or other. There are two types of defined formatters one is SimpleFormatter and another is XMLFormatter. Simple Formatter is used to write a file with simple text while XMLFormatter writes the file into xml format.

There are two programs available in this section. First program has been written for writing log records into a log file in simple text format and another is for writing log records to a XML file in XML format. See the detail information bellow:

Descriptions of program:

This program creates a logger with the help of Logger class and also constructs a log file. If, the file already exists then SimpleFormatter class provides the facility for writing log records into specified log file in simple text format.

Descriptions of code:

SimpleFormatter():
This is the constructor of SimpleFormatter class which is the class of
java.util.logging package. This constructor writes the detail information's of log records to the file under stable format typically one or two lines. The file is written in that format which is more readable for user.

fhand.setFormatter():
Above method sets formatter  into Handler.

Here is the code of SetSimpleFormatter.java:

import java.io.*;
import java.util.logging.*;

public class SetSimpleFormatter{
  public static void main(String[] args) {
  SetSimpleFormatter f = new SetSimpleFormatter();
  }
  public SetSimpleFormatter(){
  Logger log = Logger.getLogger("RoseIndia.Net");
  try{
  FileHandler fhand = new FileHandler("vinod.log"true);
  fhand.setFormatter(new SimpleFormatter());  
  log.addHandler(fhand);
  log.info("This is info message");
  log.warning("This is warning message");
  }
  catch (IOException e){}
  }
}

Download this example.

Output of program

Descriptions of program:

This program creates a logger and XML file that provides the facility for appending log records through the append properties is true of FileHandler. If the given file name is already exist then XML formatter writes log records in to specified XML file.

Descriptions of code:

XMLFormatter():
Above is the constructor of XMLFormatter class that extends the Formatter and imports the
import java.util.logging package. It writes log records into a standard XML format. 

Here is the code of SetXmlFormatter.java:

import java.io.*;
import java.util.logging.*;

public class SetXmlFormatter{
  public static void main(String[] args) {
  Logger log = Logger.getLogger("RoseIndia.Net");
  try{
  FileHandler xhand = new FileHandler("vinod.xml",true);
  xhand.setFormatter(new XMLFormatter());
  log.addHandler(xhand);
  log.info("This is info message");
  log.warning("This is warning message");
  }
  catch (IOException e){}
  }
}

Download this example.

Output of program:

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Posted on: February 22, 2008

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