Java HTTP Header submitHttpRequest(String url, Map headers, String data)

Description

Utility method used to submit an HTTP request.

License

Open Source License

Declaration

public static String submitHttpRequest(String url, Map<String, String> headers, String data)
        throws IOException 

Method Source Code

//package com.java2s;
/*//from   w  ww.  ja  va2 s .  co  m
 * /////////////////////////////////////////////////////////////////////////////
 * // This file is part of the "Hyrax Data Server" project.
 * //
 * //
 * // Copyright (c) 2014 OPeNDAP, Inc.
 * // Author: Nathan David Potter  <ndp@opendap.org>
 * //
 * // This library 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 2.1 of the License, or (at your option) any later version.
 * //
 * // This library 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 library; if not, write to the Free Software
 * // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 * //
 * // You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 * /////////////////////////////////////////////////////////////////////////////
 */

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

public class Main {
    /**
     * Utility method used to submit an HTTP request.
     *
     * This method will submit a GET request unless 'data' is non-null,
     * in which case it will be considered a POST request.
     *
     */
    public static String submitHttpRequest(String url, Map<String, String> headers, String data)
            throws IOException {
        StringBuilder result = new StringBuilder();
        HttpURLConnection connection = null;

        try {
            /**
             * Create a connection and build the request
             */
            connection = (HttpURLConnection) (new URL(url)).openConnection();

            connection.setUseCaches(false);
            connection.setDoInput(true);

            for (String key : headers.keySet()) {
                connection.setRequestProperty(key, headers.get(key));
            }

            /**
             * If data is provided, then convert it to a POST request.
             */
            if (data != null) {
                connection.setRequestMethod("POST");
                connection.setDoOutput(true);

                DataOutputStream out = new DataOutputStream(connection.getOutputStream());
                out.writeBytes(data);
                out.flush();
                out.close();
            }

            int responseCode = connection.getResponseCode();

            /**
             * Check the response to the request. We consider anything other than
             * 200 (OK) as an error, though it may be useful to be able to return
             * this value to the caller and let the caller decide.
             */
            if (responseCode != 200) {

                throw new IOException("URS failure - status " + responseCode);
            }

            /**
             * Extract the body of the response so we can return it.
             */
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

            String line;
            while ((line = in.readLine()) != null)
                result.append(line);
            in.close();
        } finally {
            if (connection != null)
                connection.disconnect();
        }

        return result.toString();
    }
}

Related

1. setHeader(final HttpURLConnection couchdbConnection, final String headerName, final String headerValue)
2. setHeader(HttpURLConnection con, Map headers)
3. setHeader(HttpURLConnection urlConnection, String key, String value)
4. setHeaders(HttpURLConnection conn, List headers, String encoding)
5. setHeadersToRequest(HttpURLConnection urlConnection, Map headersMap)