Here you can find the source of getHttpURLConnection(@Nonnull String urlStr)
@Nonnull public static HttpURLConnection getHttpURLConnection(@Nonnull String urlStr) throws IllegalArgumentException, IOException
//package com.java2s; /*/*w w w . j a va2s . c o m*/ * 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.IOException; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import javax.annotation.Nonnull; public class Main { @Nonnull public static HttpURLConnection getHttpURLConnection(@Nonnull String urlStr) throws IllegalArgumentException, IOException { if (!urlStr.startsWith("http://") && !urlStr.startsWith("https://")) { throw new IllegalArgumentException("Unexpected url: " + urlStr); } URL url = new URL(urlStr); URLConnection conn = url.openConnection(); return (HttpURLConnection) conn; } }