Java OutputStream Write copyBytesToStream(InputStream inputStream, OutputStream outputStream, int length)

Description

Copies given length amount of bytes from given inputStream to given outputStream.

License

Open Source License

Exception

Parameter	Description
IOException	if it fails to read given length amount of elements.

Declaration

public static void copyBytesToStream(InputStream inputStream, OutputStream outputStream, int length)
        throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2007, 2014 Bruno Medeiros and other Contributors.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*from  w ww . java  2s  .c  o  m*/
 *     Bruno Medeiros - initial implementation
 *******************************************************************************/

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

public class Main {
    /** Copies given length amount of bytes from given inputStream to given outputStream. 
     * Alternatively, if length == -1, copy all bytes in inputStream until EOF.
     * @throws IOException if it fails to read given length amount of elements. */
    public static void copyBytesToStream(InputStream inputStream, OutputStream outputStream, int length)
            throws IOException {
        final int BUFFER_SIZE = 1024;
        byte[] buffer = new byte[BUFFER_SIZE];

        int totalRead = 0;
        do {
            int readReqLen = (length == -1) ? BUFFER_SIZE : Math.min(BUFFER_SIZE, length - totalRead);
            int read = inputStream.read(buffer, 0, readReqLen);
            if (read == -1) {
                if (length != -1) {
                    throw createFailedToReadExpected(length, totalRead);
                } else {
                    return; // Nothing more to copy.
                }
            }
            totalRead += read;
            outputStream.write(buffer, 0, read);
        } while (totalRead != length);
    }

    private static IOException createFailedToReadExpected(int length, int totalRead) {
        return new IOException("Failed to read requested amount of characters. " + "Read: " + totalRead
                + " of total requested: " + length);
    }
}

Related

1. copyBytes(InputStream is, OutputStream bytes)
2. copyBytes(InputStream iStream, OutputStream oStream)
3. copyBytesAndClose(final InputStream is, final OutputStream os)
4. copyBytesToFile(byte[] bytes, File outputFile)
5. copyBytesToStream(ByteArrayOutputStream from, OutputStream to)
6. copyFile(File fromFile, File toFile)
7. copyFile(final InputStream in, final OutputStream out, final int size)
8. copyFile(InputStream in, OutputStream out)
9. copyFile(InputStream in, OutputStream out, boolean close)