Writing Log Records to a Log File

This section demonstrates for writing log records to a log file. Logger provides different types of level like: warning, info and severe that have log records. Log records are written into a log file that follows certain steps to given bellow:

Description of program:

This program takes a file name and check it through the exists() method. If the file is exist then log records will be written into a log file and it displays a message "Operation successfully!". Otherwise shows a message "File is not exist" and log records don't written into a log file.

Description of code:

LogRecord(Level level, String message):
The above is a constructor of LogRecord class of the java.util.logging package. This class extends Object and implements Serializable. This constructor creates a LogRecord to specified level and message.

hand.publish(LogRecord rec):
Above method takes LogRecord and publish it into specific file that means log records are written into the given file.

Here is the code of program:


import java.io.*;

import java.util.logging.*;



public class WriteRecordsToLogFile{

  public static void main(String[] args) {

  WriteRecordsToLogFile w = new WriteRecordsToLogFile();

  }

  public WriteRecordsToLogFile(){

  try{

  BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

  System.out.println("Enter file name which has '.log' extension");

  String str = buf.readLine();

  File file = new File(str + ".log");

  if(file.exists())

  {

  FileHandler hand = new FileHandler(str + ".log", true);

  Logger log = Logger.getLogger("aman raj");

  LogRecord rec1 = new LogRecord(Level.WARNING,"Do something here!");

  LogRecord rec2 = new LogRecord(Level.INFO,"Do something here!");

  LogRecord rec3 = new LogRecord(Level.SEVERE,"Do something here!");

  hand.publish(rec1);

  hand.publish(rec2);

  hand.publish(rec3);

  log.addHandler(hand);

  System.out.println("Operation successfully!");

  }

  else{

  System.out.println("File is not exist");

  }

  }

  catch (IOException e){}

  }

}

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