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Thread: Problem with Reading very long line using bufferedReader

  1. #1
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    Default Problem with Reading very long line using bufferedReader

    I am reading file line by line using bufferedReader in java.
    My file contains very long lines (about 913434 characters per line).

    FileInputStream inStream=new FileInputStream(inFile);
    DataInputStream inDataStream=new DataInputStream(inStream);
    BufferedReader br=new BufferedReader(new InputStreamReader(inDataStream));

    String str=null;
    while ((str = br.readLine()) !=null){
    System.out.println(str);
    }

    But it's always give some portion of line . It's failed to read whole line.
    Please , help me on How to read whole line ?

    Thanks,


  2. #2

    Default Re: Problem with Reading very long line using bufferedReader

    Try using a scanner instead:

    Scanner scanner = new Scanner(new File(inFile));
     
    while(scanner.hasNextLine())
    {
    System.out.println(scanner.nextLine());
    }
    Kenneth Walter
    Software Developer
    http://kennywalter.com

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Problem with Reading very long line using bufferedReader

    It's failed to read whole line.
    How much of the line does it read?
    Does it read the same amount every time?

  4. #4

    Default Re: Problem with Reading very long line using bufferedReader

    Apparently, BufferedReader is better for reading line streams from a text file and the limit for strings is 2 billion characters. My suggesstion: read the file one character at a time...
    Kenneth Walter
    Software Developer
    http://kennywalter.com

  5. #5
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    Default Re: Problem with Reading very long line using bufferedReader

    This test program seems to write and read 913434 bytes with no problem.
        String inFile = "LargeFile.txt";   // the file name 
        FileOutputStream fos = new FileOutputStream(inFile);
        for(int i=0; i < 913434; i++) {
          fos.write('A');   // Write all 'A's to the file
        }
        fos.close();
        FileInputStream inStream = new FileInputStream(inFile);
        DataInputStream inDataStream = new DataInputStream(inStream);
        BufferedReader br = new BufferedReader(new InputStreamReader(inDataStream));
     
        String str = null;
        while ((str = br.readLine()) != null){
          System.out.println("len=" + str.length());  // len=913434
        }

    How do you know that there is no lineend in the file?
    What bytes are in the file at the location where readLine() stops reading a line?

  6. #6
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    Default Re: Problem with Reading very long line using bufferedReader

    Sorry @all, :-)
    Problem is just because of i forgot to close FileWriter object.....
    Now its working correctly....
    Last edited by nicool; November 7th, 2011 at 01:35 PM.

  7. #7
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    Default Re: Problem with Reading very long line using bufferedReader

    Thanks for your suggestions

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