Here you can find the source of copyURLToFile(URL in, File out)
public static void copyURLToFile(URL in, File out) throws IOException
//package com.java2s; /*// w w w . j a va 2 s . c o m return HttpUtils. * The contents of this file are subject to the terms of the Common Development and * Distribution License (the License). You may not use this file except in compliance with the * License. * * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the * specific language governing permission and limitations under the License. * * When distributing Covered Software, include this CDDL Header Notice in each file and include * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL * Header, with the fields enclosed by brackets [] replaced by your own identifying * information: "Portions copyright [year] [name of copyright owner]". * * Portions copyright 2012-2015 ForgeRock AS. */ import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.net.URL; import java.nio.channels.Channels; import java.nio.channels.FileChannel; import java.nio.channels.ReadableByteChannel; public class Main { public static void copyURLToFile(URL in, File out) throws IOException { ReadableByteChannel inChannel = Channels.newChannel(in.openStream()); FileChannel outChannel = new FileOutputStream(out).getChannel(); try { outChannel.transferFrom(inChannel, 0, 1 << 24); } catch (IOException e) { throw e; } finally { if (inChannel != null) inChannel.close(); if (outChannel != null) outChannel.close(); } } }