get Redirected Url - Android Network

Android examples for Network:HTTP

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Description

get Redirected Url

Demo Code

/***************************************************************************
 *   Copyright 2005-2009 Last.fm Ltd.                                      *
 *   Portions contributed by Casey Link, Lukasz Wisniewski,                *
 *   Mike Jennings, and Michael Novak Jr.                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/
//package com.java2s;

import java.io.IOException;

import java.net.HttpURLConnection;
import java.net.URL;

public class Main {
    private static final int REDIRECT_RESPONSE_CODE = 302;
    public static String useragent;

    public static URL getRedirectedUrl(URL url) throws IOException {
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        setUserAgent(conn);//w w w  .ja  va2  s  . c  o  m
        conn.setRequestMethod("GET");
        conn.setInstanceFollowRedirects(false);
        conn.setRequestProperty("connection", "close");
        int rc = conn.getResponseCode();
        if (rc != REDIRECT_RESPONSE_CODE) {
            throw new IOException("code " + rc + " '"
                    + conn.getResponseMessage() + "'");
        }
        String location = conn.getHeaderField("Location");
        if (location == null) {
            throw new IOException("No 'Location' header found");
        }
        return new URL(location);
    }

    /** mainly sets the User-Agent we need */
    private static void setUserAgent(HttpURLConnection conn) {
        if (useragent != null)
            conn.setRequestProperty("User-Agent", useragent);
    }
}

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