How to output progress indicator instead of the actual file contents

Question

I have the following method the reads text file:

public static void readFile(String path) {

    BufferedReader br = null;
    try {
        String sCurrentLine;

        br = new BufferedReader(new FileReader(path));

        while ((sCurrentLine = br.readLine()) != null) {
            System.out.println(sCurrentLine); // Progress indicator!
        }

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (br != null)br.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}

My file is really large ~ 700MB, I would love to be able to print progress indicator or percentage instead of printing the actual file on the console which really does not look good. Something probably like this:

========================================================== 100%

Any hint is appreciated.

Perhaps http://stackoverflow.com/questions/23167319/how-to-use-java-progress-bar-while-read-a-text-file could help? — GuiSim, Apr 25 '16 at 20:27

score 2 · Accepted Answer · answered Apr 25 '16 at 20:29

you have to change your System.out.println with progress. But for that you need couple of things.

Get the file size using File object i.e.

File f = new File (path); double fileSize = f.length(); br = new BufferedReader(new FileReader(path));

Now inside the while loop. Everytime you read string you have to do something like this

int percentRead = 0

while ((sCurrentLine = br.readLine()) != null) {

double bytesRead += (sCurrentLine.getBytes().length);

int newPercentRead = (int)((bytesRead/fileSize) * 100);

while (percentRead <= newPercentRead){

    System.out.print("#");

    percentRead++;

}

}

Its not tested, so you might have to tweak it around.

Thank you ... I will try it – Jeffry Hods Apr 25 '16 at 20:42 — Jeffry Hods, Apr 25 '16 at 20:42

How to output progress indicator instead of the actual file contents

1 Answers1