Create a custom formatter

A formatter formats events. Handlers are associated with one or more formatters.

The mechanism for creating a customer formatter is the Formatter class support provided by the IBM Developer Kit, Java Technology Edition. If you are not familiar with formatters as implemented by the Developer's Kit, one can get more information from various texts, or by reading the Javadoc for java.util.logging.

The following is an example of a custom formatter

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

/**
 * MyCustomFormatter formats the LogRecord as follows:
 * date   level   localized message with parameters 
 */
public class MyCustomFormatter extends Formatter {

  public MyCustomFormatter() {
    super();
  }

  public String format(LogRecord record) {
    
    // Create a StringBuffer to contain the formatted record
    // start with the date.
    StringBuffer sb = new StringBuffer();
    
    // Get the date from the LogRecord and add it to the buffer
    Date date = new Date(record.getMillis());
    sb.append(date.toString());
    sb.append(" ");
    
    // Get the level name and add it to the buffer
    sb.append(record.getLevel().getName());
    sb.append(" ");
     
    // Get the formatted message (includes localization 
    // and substitution of paramters) and add it to the buffer
    sb.append(formatMessage(record));

    return sb.toString();
  }
}

 

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