Java Cookie getCookies(final URL url)

Description

Returns the cookies returned by the server on accessing the URL.

License

Open Source License

Parameter

Parameter	Description
url	a parameter

Exception

Parameter	Description
IOException	an exception

Return

The cookies as string, build by .

Declaration

public static String getCookies(final URL url) throws IOException 

Method Source Code

//package com.java2s;
/**//from  w w  w.  j  a  v a2  s.com
 *
 *  BibSonomy-Web-Common - A blue social bookmark and publication sharing system.
 *
 *  Copyright (C) 2006 - 2011 Knowledge & Data Engineering Group,
 *                            University of Kassel, Germany
 *                            http://www.kde.cs.uni-kassel.de/
 *
 *  This program 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
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser 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.
 */

import java.io.IOException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.List;

public class Main {
    /**
     * The user agent used for all requests with {@link HttpURLConnection}.
     */
    private static final String USER_AGENT_PROPERTY_VALUE = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)";
    private static final String USER_AGENT_HEADER_NAME = "User-Agent";

    /**
     * Returns the cookies returned by the server on accessing the URL. 
     * The format of the returned cookies is as
     * 
     * 
     * @param url
     * @return The cookies as string, build by {@link #buildCookieString(List)}.
     * @throws IOException
     */
    public static String getCookies(final URL url) throws IOException {
        final HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();

        urlConn.setAllowUserInteraction(false);
        urlConn.setDoInput(true);
        urlConn.setDoOutput(false);
        urlConn.setUseCaches(false);

        urlConn.setRequestProperty(USER_AGENT_HEADER_NAME, USER_AGENT_PROPERTY_VALUE);

        urlConn.connect();

        final List<String> cookies = urlConn.getHeaderFields().get("Set-Cookie");
        urlConn.disconnect();

        return buildCookieString(cookies);
    }

    /**
     * Builds a cookie string as used in the HTTP header.
     * 
     * @param cookies - a list of key/value pairs
     * @return The cookies folded into a string.
     */
    public static String buildCookieString(final List<String> cookies) {
        final StringBuffer result = new StringBuffer();

        if (cookies != null) {
            for (final String cookie : cookies) {
                if (result.length() != 0)
                    result.append(";");
                result.append(cookie);
            }
        }
        return result.toString();
    }
}

Related

1. storeCookies(HttpURLConnection connection)