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Thread: How to Read a Portion of a File in Java?

  1. #1
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    Default How to Read a Portion of a File in Java?

    Hi folks,

    Output Should be:

    Date Bill Bill DateDescript Frm To Dist pur Qty @ Amt Rmk

    01/02/08 256 01/02/08 Ring Hyd Bng 100 xyz 100 abcd 100 top
    02/05/08 325 05/02/08 paper Chnn Bng 25 offi 850 kir 1000 good
    11/05/08 898 21/08/08 pen Hyd Pun 2532 Offi 200 Abv 500 Bad
    11/02/08 998 21/08/08 Pencil Mum Bng 258 Off 205 Acc 600 Good
    02/05/08 968 30/08/08 Bag Hyd Bng 265 Xyz 536 Acc 635 Bad
    Attached Files Attached Files
    Last edited by jazz2k8; May 19th, 2008 at 06:11 AM.


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: How to Read a Portion of a File

    Hey jazz2k8,

    I would suggest using Regular expressions to do this.

    This should get you started:

    import java.io.BufferedReader;
    import java.io.FileInputStream;
    import java.io.InputStreamReader;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    public class Expense {
     
     public static String inputFile = "expense.txt";
     
     public void formatFile() {
     
      try
      {
      FileInputStream in = new FileInputStream(inputFile);
      BufferedReader br = new BufferedReader(new InputStreamReader(in));
      String strLine;
     
      String regEx1 = "([0-9]/)"; 
      Pattern regEx1P = Pattern.compile(regEx1);
     
      System.out.println("Date     " + "Bill   " + "BillDate " + "Descript" + " Frm   " +
        "To  " + "Dist   " + "pur   " + "Qty " + " @  " + "Amt    " + "Rmk");
     
      while((strLine = br.readLine())!= null)
      {   
       Matcher match1 = regEx1P.matcher(strLine);
     
       if (match1.find())
       {
        System.out.println(strLine);
       }
     
       //System.out.println(strLine);
      }
      }
      catch (Exception e)
      {
       System.out.println("Ouch! " + e);
      }
     }
     
     public static void main(String[] args) {
      Expense exp = new Expense();
      exp.formatFile();
     
     }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: How to Read a Portion of a File

    Thanks alot PF.....

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    Default Re: How to Read a Portion of a File

    Please PF if you make comments for this sample.
    Thanks for your help

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