Loggers in Java, Redirecting Log contents in a Log file in Java

Loggers in Java, Redirecting Log contents in a Log file in Java

Dear reader,
Here is the complete coding where we can configure a logger and redirect the logger contents
into a separate file for proper tracing.

//LoggerTest.java
package com.ewp.services;
import java.util.logging.*;
import java.io.*;

public class LoggerTest {

public static Logger logger;

static {
    try {
      boolean append = true;
      FileHandler fh = new FileHandler("D://Temp//log.properties", append);
      fh.setFormatter(new Formatter() {
         public String format(LogRecord rec) {
            StringBuffer buf = new StringBuffer(1000);
            buf.append(new java.util.Date());
            buf.append("===>");
            buf.append(formatMessage(rec));
            buf.append('\n');
            return buf.toString();
            }
          });
      logger = Logger.getLogger("TestLog");
      logger.addHandler(fh);
    }
    catch (IOException e) {
      e.printStackTrace();
    }
}

public static void main(String args[]) {
    logger.severe("Severe category messages");
    logger.warning("Warning categary messages");
    logger.info("Info level messages");
    }
}

//Output in file "D:\Temp\log.properties"
/*
Mon Aug 29 15:39:48 IST 2011===>Severe category messages
Mon Aug 29 15:39:49 IST 2011===>Warning categary messages
Mon Aug 29 15:39:49 IST 2011===>Info level messages
*/