Here you can find the source of getAbsoluteUrl(URL baseUrl, String relativeUrl)
public static URL getAbsoluteUrl(URL baseUrl, String relativeUrl) throws MalformedURLException
//package com.java2s; /**// w w w . j a v a2 s . c om * Copyright (c) 2013 Lumata * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.net.MalformedURLException; import java.net.URL; public class Main { public static URL getAbsoluteUrl(URL baseUrl, String relativeUrl) throws MalformedURLException { if (isAbsolute(relativeUrl)) { return new URL(relativeUrl); } return new URL(baseUrl, relativeUrl); } public static boolean isAbsolute(String url) { return url.matches("^.*://.*"); } }