Log4j File Appenders - LOGGING TO A FILE

package com.jwt.log;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class Log4jDemo {

	static final Logger logger = Logger.getLogger(Log4jDemo.class);
	static final String LOG_PROPERTIES_FILE = "log4j.properties";

	public static void main(String[] args) {
		new Log4jDemo();
		// sample info log message
		logger.info("leaving the main method of Log4JDemo");
	}

	public Log4jDemo() {
		initializeLogger();
		// sample info log message
		logger.info("Log4jDemo - leaving the constructor ...");
	}

	private void initializeLogger() {
		Properties logProperties = new Properties();

		try {
			// load log4j properties configuration file
			logProperties.load(new FileInputStream(LOG_PROPERTIES_FILE));
			PropertyConfigurator.configure(logProperties);
			logger.info("Logging initialized.");
		} catch (IOException e) {
			logger.error("Unable to load logging property :", e);
		}
		try {
			FileInputStream fstream = new FileInputStream("D:\\textfile.txt");
			DataInputStream in = new DataInputStream(fstream);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			String strLine;
			while ((strLine = br.readLine()) != null) {
				System.out.println(strLine);
			}
			in.close();
		} catch (FileNotFoundException fe) {
			logger.error("File Not Found", fe);
			logger.warn("This is a warning message");
			logger.trace("This message will not be logged since log level is set as DEBUG");
		} catch (IOException e) {
			logger.error("IOEXception occured:", e);
		}
	}
}