Here you can find the source of downloadFromHttpUrl(String destPkgUrl, FileOutputStream outputStream)
public static void downloadFromHttpUrl(String destPkgUrl, FileOutputStream outputStream) throws IOException
//package com.java2s; /**//ww w . ja va 2 s. c om * 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.*; import java.net.URL; import java.nio.channels.Channels; import java.nio.channels.ReadableByteChannel; public class Main { public static void downloadFromHttpUrl(String destPkgUrl, FileOutputStream outputStream) throws IOException { URL website = new URL(destPkgUrl); ReadableByteChannel rbc = Channels.newChannel(website.openStream()); outputStream.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); } }