Here you can find the source of getInputStreamReader(URL url)
public static InputStreamReader getInputStreamReader(URL url) throws IOException
//package com.java2s; /*/* ww w .java 2 s. c om*/ * JBoss, Home of Professional Open Source. * Copyright 2008, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class Main { public static InputStreamReader getInputStreamReader(URL url) throws IOException { return new InputStreamReader(getInputStream(url)); } public static InputStreamReader getInputStreamReader(String resource) throws IOException { try { URL url = new URL(resource); return getInputStreamReader(url); } catch (MalformedURLException mue) { ClassLoader cl = Thread.currentThread().getContextClassLoader(); InputStream is = cl.getResourceAsStream(resource); if (is == null) throw new IllegalArgumentException("No resource " + resource + " found"); return new InputStreamReader(is); } } public static InputStream getInputStream(URL url) throws IOException { URLConnection conn = url.openConnection(); conn.connect(); return conn.getInputStream(); } public static InputStream getInputStream(String resource) throws IOException { try { URL url = new URL(resource); return getInputStream(url); } catch (MalformedURLException mue) { ClassLoader cl = Thread.currentThread().getContextClassLoader(); return cl.getResourceAsStream(resource); } } }