Java URL Value Check checkURLAvailable(String targetUrl)

Description

check URL Available

License

Open Source License

Parameter

Parameter	Description
targetUrl	a parameter

Declaration

public static String checkURLAvailable(String targetUrl) 

Method Source Code

//package com.java2s;
/*/*from  w  w w .  j  av  a  2  s.c  o m*/
 * Web-Snapshot
 * Copyright (C) 2008-2014  Open-S Company
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contact us by mail: open-s AT open-s DOT com
 */

import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    public static final String URL_AVAILABLE = "OK";
    public static final String URL_NOT_AVAILABLE = "This url is not available";
    private static final int MIN_HTTP_VALID_CODE = 200;
    private static final int MAX_HTTP_VALID_CODE = 400;

    /**
     *
     * @param targetUrl
     * @return
     */
    public static String checkURLAvailable(String targetUrl) {
        try {
            URL url = new URL(targetUrl);
            URLConnection urlConnection = url.openConnection();

            HttpURLConnection.setFollowRedirects(true);
            HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
            httpURLConnection.setRequestMethod("HEAD");

            if (httpURLConnection.getResponseCode() >= MIN_HTTP_VALID_CODE
                    && httpURLConnection.getResponseCode() < MAX_HTTP_VALID_CODE) {
                return URL_AVAILABLE;
            }
            urlConnection = url.openConnection();
            httpURLConnection.disconnect();
            HttpURLConnection.setFollowRedirects(true);
            httpURLConnection = (HttpURLConnection) urlConnection;
            httpURLConnection.setRequestMethod("GET");

            if (httpURLConnection.getResponseCode() >= MIN_HTTP_VALID_CODE
                    && httpURLConnection.getResponseCode() < MAX_HTTP_VALID_CODE) {
                return URL_AVAILABLE;
            } else {
                return Integer.toString(httpURLConnection.getResponseCode()) + " "
                        + httpURLConnection.getResponseMessage();
            }
        } catch (Exception e) {
            return URL_NOT_AVAILABLE;
        }
    }
}

Related

1. checkURL(String _url)
2. checkUrl(String inputUrlString)
3. checkUrl(String url, int timeout)
4. checkURL(URL check)
5. checkUrl(URL url, URL baseUrl)
6. checkUrlImage(final String url)
7. checkURLStatus(String pURL)
8. checkURLValidProtocol(URL url)
9. invokePostUrl(String url, String encodedQueryString)