Java InputStream to OutputStream copyStreams(InputStream in, OutputStream out, int buf)

Description

Copy the input from one stream to the output of another until EOF.

License

Open Source License

Parameter

Parameter	Description
in	input stream
out	output stream
buf	buffer size (-1 means don't buffer)

Declaration

public static void copyStreams(InputStream in, OutputStream out, int buf) throws IOException 

Method Source Code

//package com.java2s;
/**//  ww w .  j  av  a  2s  .com
 * Appframework
 * Copyright (C) 2003-2016 SSHTOOLS Limited
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 */

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Main {
    /**
     * Copy the input from one stream to the output of another until EOF. It
     * is up to the invoker to close the streams.
     *
     * @param in input stream
     * @param out output stream
     * @param buf buffer size (-1 means don't buffer)
     */
    public static void copyStreams(InputStream in, OutputStream out, int buf) throws IOException {
        copyStreams(in, out, buf, -1);
    }

    /**
     * Copy the input from one stream to the output of another for a number of
     * bytes (-1 means until EOF)
     *
     * @param in input stream
     * @param out output stream
     * @param buf buffer size (-1 means don't buffer)
     * @param bytes bytes to copy
     */
    public static void copyStreams(InputStream in, OutputStream out, int buf, long bytes) throws IOException {
        InputStream bin = buf == -1 ? in : new BufferedInputStream(in, buf);
        OutputStream bout = buf == -1 ? out : new BufferedOutputStream(out, buf);
        byte[] b = null;
        int r = 0;
        while (true && (bytes == -1 || (r >= bytes))) {
            int a = bin.available();
            if (a == -1)
                break;
            else if (a == 0)
                a = 1;
            if (bytes != -1 && (r + a) > bytes)
                a -= (r + a - bytes);
            b = new byte[a];
            a = bin.read(b);
            if (a == -1)
                break;
            r += a;
            bout.write(b, 0, a);
        }
        bout.flush();
    }
}

Related

1. copyStreams(final InputStream input, final OutputStream output)
2. copyStreams(InputStream from, OutputStream to, int blockSize)
3. copyStreams(InputStream in, OutputStream out)
4. copyStreams(InputStream in, OutputStream out)
5. copyStreams(InputStream in, OutputStream out)
6. copyStreams(InputStream input, OutputStream output)
7. copyStreams(InputStream inputStream, OutputStream outputStream)
8. copyStreams(InputStream is, OutputStream os)
9. copyStreams(InputStream source, OutputStream destination)