How to write in file by BufferedOutputStream?

java bufferedinputstream bufferedoutputstream
vimalraturi picture vimalraturi · Aug 12, 2014 · Viewed 13k times · Source

I want to copy data from demo1.txt to demo2.txt, although I can do it by BufferedReader, I want to copy by BufferedInputStream / BufferedOutputStream. Please show me how to do this.

import java.io.*;
class stream4
{
    public static void main(String arr[])
    {
        BufferedInputStream bfis=new BufferedInputStream(new FileInputStream("demo1.txt"));
        BufferedOutputSteam bfos=new BufferedOutputStream(new FileOutputStream("demo2.txt"));
        byte b[]=(bfis.read());
        bfos.write(b);
        bfis.close();
        bfos.close();
    }
}

Answer

SparkOn picture SparkOn · Aug 12, 2014

change

byte b[]=(bfis.read());

to

    byte[] b = new byte[1024];
    try {
        for (int readNum; (readNum = bfis.read(b)) != -1;) {
            bfos.write(b, 0, readNum);
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }
    finally {
        bfis.close();
        bfos.close();
    }

as bfis.read() the next byte of data, or -1 if the end of the stream is reached.

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