Using Custom Formatters

By extending Formatter class we can provide custom formatters. Formatter class has abstract method format(LogRecord record), which formats the log record before publishing it to the external world.

import java.util.logging.*;

public class CustomFormat extends Formatter{
    @Override
    public String format(LogRecord record) {
       StringBuilder str = new StringBuilder();
       
       str.append("Logger Name : ");
       str.append(record.getLoggerName() + "\n");
       str.append("Level of the logger : ");
       str.append(record.getLevel() +"\n");
       str.append("Message : ");
       str.append(record.getMessage() +"\n");
       
       return str.toString();
    }
}

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

public class FormatEx {
    static final Logger myLogger = Logger.getLogger("Simple Logger");
    
    public static void main(String args[]) throws IOException{
        Handler handler1 = new FileHandler("file1.out");
        CustomFormat format = new CustomFormat();
        
        myLogger.addHandler(handler1);
        myLogger.setLevel(Level.ALL);
        
        handler1.setFormatter(format);
        
        myLogger.log(Level.INFO, "Information Message");
        myLogger.log(Level.WARNING, "Warning Message");
        myLogger.log(Level.SEVERE, "Severe Message");
        
        handler1.close();
    }
}

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