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";
}
}
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