HttpPost.java

/*
 * Copyright (C) 2010 Pete Reisinger <p.reisinger@gmail.com>.
 * 
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

package paypalnvp.core;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Class for sending request using http post method and returning response.
 *
 * @author Pete Reisinger
 *         <p.reisinger@gmail.com>
 */
@SuppressWarnings("serial")
final class HttpPost implements Transport {

    /**
     * Sends request (msg attribute) to the specified url and returns response as a string
     *
     * @param urlString url where to send the request
     * @param msg       request message to be sent
     * @return response message
     * @throws MalformedURLException
     */
    public String getResponse(String urlString, String msg) throws MalformedURLException {

        // System.out.println(urlString);
        // System.out.println(msg);

    /* write request */
        URL url = new URL(urlString);
        URLConnection connection;
        StringBuffer response = new StringBuffer();

        try {
            connection = url.openConnection();
            connection.setDoOutput(true);
            connection.setConnectTimeout(15000);

      /* write request */
            OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
            writer.write(msg);
            writer.flush();
            writer.close();

      /* read response */
            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                // System.out.println(line);
                response.append(line);
            }
            reader.close();

        } catch (IOException ex) {
            Logger.getLogger(HttpPost.class.getName()).log(Level.SEVERE, null, ex);
        }

    /* return response */
        return response.toString();
    }

    @Override
    public String toString() {
        return "instance of HttpPost class";
    }
}