Here you can find the source of openStream(URL url)
public static InputStream openStream(URL url) throws IOException
//package com.java2s; /****************************************************************************** * * Copyright 2014 Paphus Solutions Inc. * * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html * * 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.//from ww w .j a v a 2 s . c o m * ******************************************************************************/ import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; public class Main { public static int URL_TIMEOUT = 5000; public static InputStream openStream(URL url) throws IOException { return openStream(url, URL_TIMEOUT); } public static InputStream openStream(URL url, int timeout) throws IOException { URLConnection connection = url.openConnection(); connection.setConnectTimeout(timeout); connection.setReadTimeout(timeout); return connection.getInputStream(); } }