Subclassing java.util.logging.Formatter doesn't work

Question

I am using java.util.logging for logging (I don\'t want to use log4j or anything else).

This is my complete private logging.properties:

Answer 1

You can set the formatter in the code itself on the FileHandler instance.

import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.Logger;

// please change name of your own choice
Logger log = Logger.getLogger("CustomLogger"); 
log.setUseParentHandlers(false);
log.setLevel(Level.ALL);

FileHandler handler = new FileHandler("[log_file_location]");
handler.setFormatter(new CustomFormatter()); // set formatter
log.addHandler(handler);

log.info("test message");

handler.close(); // close the handler at some later point in your application.

The CustomFormatter class is defined as follows.

import java.util.logging.Formatter;
import java.util.logging.LogRecord;

public class CustomFormatter extends Formatter {

    @Override
    public String format(LogRecord record) {
        StringBuffer buffer = new StringBuffer();
        buffer.append(record.getMessage());
        return buffer.toString();
    }

}

You can code in CustomFormatter to output the messages in any format you want. Hope this helps.