Here you can find the source of write(ByteBuffer buffer, DataOutput out)
public static void write(ByteBuffer buffer, DataOutput out) throws IOException
//package com.java2s; /*//w w w. j av a 2 s . c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.DataOutput; import java.io.IOException; import java.nio.ByteBuffer; public class Main { public static void write(ByteBuffer buffer, DataOutput out) throws IOException { if (buffer.hasArray()) { out.write(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining()); } else { for (int i = buffer.position(); i < buffer.limit(); i++) { out.writeByte(buffer.get(i)); } } } }