Reading file in java line by line...

Example to read file line by line...







import java.io.FileReader;

import java.io.IOException;

import java.io.LineNumberReader;

 

public class LineNumberReaderExample

{

   public static void main(String[] args)

   {

      readFromFile("app.properties");

   }

 

   private static void readFromFile(String filename)

   {

      LineNumberReader lineNumberReader = null;

      try

      {

         //Construct the LineNumberReader object

         lineNumberReader = new LineNumberReader(new FileReader(filename));

          

         //Print initial line number

         System.out.println("Line " + lineNumberReader.getLineNumber());

          

         //Setting initial line number

         lineNumberReader.setLineNumber(5);

          

         //Get current line number

         System.out.println("Line " + lineNumberReader.getLineNumber());

          

         //Read all lines now; Every read increase the line number by 1

         String line = null;

         while ((line = lineNumberReader.readLine()) != null)

         {

            System.out.println("Line " + lineNumberReader.getLineNumber() + ": " + line);

         }

      }

      catch (Exception ex)

      {

         ex.printStackTrace();

      } finally

      {

         //Close the LineNumberReader

         try {

            if (lineNumberReader != null){

               lineNumberReader.close();

            }

         } catch (IOException ex){

            ex.printStackTrace();

         }

      }

   }

}

 

Output:

 

Line 0

Line 5

Line 6: firstName=Lokesh

Line 7: lastName=Gupta

Line 8: blog=howtodoinjava

Line 9: technology=java