Java InputStream to OutputStream copyStream(InputStream inputStream, OutputStream outputStream)

Description

Copies all bytes in given inputStream (until EOF) to given outputStream.

License

Open Source License

Declaration

public static void copyStream(InputStream inputStream, OutputStream outputStream) 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:/*w  w  w.j a va  2 s .  co  m*/
 *     Bruno Medeiros - initial implementation
 *******************************************************************************/

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

public class Main {
    /** Copies all bytes in given inputStream (until EOF) to given outputStream. 
     * Closes inputStream and outputStream. */
    public static void copyStream(InputStream inputStream, OutputStream outputStream) throws IOException {
        copyStream(inputStream, outputStream, true);
    }

    /** Copies all bytes in given inputStream (until EOF) to given outputStream. 
     * Closes inputStream and also outputStream if given closeOut is true. */
    public static void copyStream(InputStream inputStream, OutputStream outputStream, boolean closeOut)
            throws IOException {
        try {
            copyBytesToStream(inputStream, outputStream, -1);
        } finally {
            try {
                inputStream.close();
            } finally {
                if (closeOut) {
                    outputStream.close();
                }
            }
        }
    }

    /** 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. copyStream(InputStream input, OutputStream output)
2. copyStream(InputStream input, OutputStream output, boolean closeStreams)
3. copyStream(InputStream input, OutputStream output, boolean closeStreams)
4. copyStream(InputStream input, OutputStream output, int bufferSize)
5. copyStream(InputStream input, OutputStream output, int length)
6. copyStream(InputStream inputStream, OutputStream outputStream)
7. copyStream(InputStream inStream, OutputStream outStream)
8. copyStream(InputStream inStream, OutputStream outStream)
9. copyStream(InputStream is, OutputStream os)