Read a byte channel until all input is exhausted, returning the results in a byte buffer. - Java java.nio

Java examples for java.nio:ByteBuffer Read

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Description

Read a byte channel until all input is exhausted, returning the results in a byte buffer.

Demo Code

/*/*from  w  ww .  j  a  va 2 s . c o m*/
 * Copyright 2012, Emanuel Rabina (http://www.ultraq.net.nz/)
 * 
 * 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.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.util.ArrayList;

public class Main{
    /**
     * Read a byte channel until all input is exhausted, returning the results
     * in a byte buffer.
     * 
     * @param bytechannel
     * @return All remaining data in the stream.
     */
    public static ByteBuffer readRemaining(ReadableByteChannel bytechannel) {

        ArrayList<ByteBuffer> bytes = new ArrayList<>();
        int size = 0;
        while (true) {
            ByteBuffer bytedata = ByteBuffer.allocate(1024);
            int read = bytechannel.read(bytedata);
            if (read > 0) {
                size += read;
                bytes.add((ByteBuffer) bytedata.flip());
            }
            if (read != 1024) {
                break;
            }
        }

        ByteBuffer data = ByteBuffer.allocate(size);
        for (ByteBuffer bytedata : bytes) {
            data.put(bytedata);
        }
        data.rewind();
        return data;
    }
}

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