Java HTTP Request requestData(String url)

Description

request Data

License

MIT License

Declaration

public static String requestData(String url) 

Method Source Code

//package com.java2s;
/**/*from w ww  .  j  a  va2  s .c o m*/
 * This file is part of Updatifier, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016 - 2016 Flibio <http://github.com/Flibio>
 * Copyright (c) Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class Main {
    private static final String USER_AGENT = "Mozilla/5.0";

    public static String requestData(String url) {
        URL obj;
        try {
            obj = new URL(url);
        } catch (MalformedURLException e) {
            return "";
        }
        HttpURLConnection con;
        try {
            con = (HttpURLConnection) obj.openConnection();
        } catch (IOException e) {
            return "";
        }

        // optional default is GET
        try {
            con.setRequestMethod("GET");
        } catch (ProtocolException e) {
            return "";
        }

        // add request header
        con.setRequestProperty("User-Agent", USER_AGENT);

        BufferedReader in;
        try {
            in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        } catch (IOException e) {
            return "";
        }
        String inputLine;
        StringBuffer response = new StringBuffer();

        try {
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
        } catch (IOException e) {
            return "";
        }
        try {
            in.close();
        } catch (IOException e) {
            return "";
        }
        con.disconnect();
        // return result
        return response.toString();
    }
}

Related

1. makeUrlRequest(String surl, String data, String method)
2. request(boolean quiet, String method, URL url, Map body)
3. request(String httpUrl, Map httpArgMap)
4. request(String url, int timeout, String method, Map header)
5. request(String url, Map cookies, Map parameters)
6. requestDataFromUrl(URL url, byte[] tosend, String userAgent)
7. saveHttpImage(String requestUrl, String requestMethod, String outputStr, File target)
8. sendGet(String url)
9. sendGet(String url, String param)