Java InputStream Copy nio copyStream(InputStream src, OutputStream dest)

Description

copy Stream

License

Apache License

Declaration

public static void copyStream(InputStream src, OutputStream dest) throws IOException 

Method Source Code

//package com.java2s;
/**/*from   w ww  .  ja  va  2  s. co  m*/
 * The Accord Project, http://accordproject.org
 * Copyright (C) 2005-2013 Rafael Marins, http://rafaelmarins.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

public class Main {
    /**
     * Default buffer size of 32Kb for I/O use in this library.
     */
    public static final int DEFAULT_BUFFER_SIZE = 32 * 1024;

    public static void copyStream(InputStream src, OutputStream dest) throws IOException {

        ReadableByteChannel in = Channels.newChannel(src);
        WritableByteChannel out = Channels.newChannel(dest);

        copyChannel(in, out);

        in.close();
        out.close();

    }

    private static void copyChannel(ReadableByteChannel source, WritableByteChannel dest) throws IOException {

        ByteBuffer buffer = ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE);

        while (source.read(buffer) != -1) {
            // prepare the buffer to be drained
            buffer.flip();

            // write to the channel; may block
            dest.write(buffer);

            // if partial transfer, shift remainder down
            // if buffer is empty, same as doing clear()
            buffer.compact();
        }

        // EOF will leave buffer in fill state
        buffer.flip();

        // make sure that the buffer is fully drained
        while (buffer.hasRemaining()) {
            dest.write(buffer);
        }

    }
}

Related

1. copyStream(final InputStream aInStream, final OutputStream aOutStream)
2. copyStream(final InputStream in)
3. copyStream(final InputStream is, final OutputStream os)
4. copyStream(InputStream in, OutputStream out)
5. copyStream(InputStream input, OutputStream output)