Java HTTP Post doPost(String targetURL, String urlParameters, String contentType)

Description

executes a post to the targetURL.

License

Open Source License

Parameter

Parameter	Description
targetURL	a parameter
urlParameters	a parameter

Declaration

public static byte[] doPost(String targetURL, String urlParameters, String contentType) 

Method Source Code

//package com.java2s;
/*//from  w w w  .  j av a 2  s  . c om
 *  Copyright (C) 2010-2012 Stichting Akvo (Akvo Foundation)
 *
 *  This file is part of Akvo FLOW.
 *
 *  Akvo FLOW is free software: you can redistribute it and modify it under the terms of
 *  the GNU Affero General Public License (AGPL) as published by the Free Software Foundation,
 *  either version 3 of the License or any later version.
 *
 *  Akvo FLOW 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 Affero General Public License included below for more details.
 *
 *  The full license text can also be seen at <http://www.gnu.org/licenses/agpl.html>.
 */

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {
    private static final int BUF_SIZE = 1024;

    /**
     * executes a post to the targetURL. The urlParmeters will be sent as POST data rather than on
     * the query string. UrlParameters should omit the leading "?" but should include the &
     * separator character. It is assumed that the urlParameters have already been url encoded.
     * 
     * @param targetURL
     * @param urlParameters
     * @return
     */
    public static byte[] doPost(String targetURL, String urlParameters, String contentType) {
        URL url;
        HttpURLConnection connection = null;
        try {
            url = new URL(targetURL);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestProperty("Content-Length", "" + Integer.toString(urlParameters.getBytes().length));
            connection.setRequestProperty("Content-Language", "en-US");

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

            DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
            wr.writeBytes(urlParameters);
            wr.flush();
            wr.close();

            InputStream is = connection.getInputStream();
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int bytesRead = 0;
            byte[] buffer = new byte[BUF_SIZE];
            while ((bytesRead = is.read(buffer)) > 0) {
                bos.write(buffer, 0, bytesRead);
            }
            is.close();
            return bos.toByteArray();

        } catch (Exception e) {
            e.printStackTrace(System.err);
            return null;
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
    }

    public static byte[] doPost(String targetURL, String urlParameters) {
        return doPost(targetURL, urlParameters, "application/x-www-form-urlencoded");
    }
}

Related

1. doHttpPost(URL url, String requestBody)
2. doPOST(HttpURLConnection conn, InputStream input)
3. doPost(String theURL, Map nameValuePairs)
4. doPost(URL url, String body, String... args)
5. executePost(String url, JSONObject data)
6. executePostWithCredentials(String targetURL, String urlParameters, String userName, String password)