Here you can find the source of getInputStream(URL url)
public static InputStream getInputStream(URL url) throws IOException
//package com.java2s; /*//from ww w .j ava 2 s.c o m * Copyright 2004-2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Sun designates this * particular file as subject to the "Classpath" exception as provided * by Sun in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. */ import java.io.*; import java.net.*; import sun.net.www.ParseUtil; public class Main { public static InputStream getInputStream(URL url) throws IOException { if ("file".equals(url.getProtocol())) { String path = url.getFile().replace('/', File.separatorChar); path = ParseUtil.decode(path); return new FileInputStream(path); } else { return url.openStream(); } } }