Java URL to Host Name getHost(String url)

Description

get Host

License

Open Source License

Declaration

public static String getHost(String url) 

Method Source Code

//package com.java2s;
/******************************************************************************* 
 * Copyright (c) 2012-2016 Red Hat, Inc. 
 * Distributed under license by Red Hat, Inc. All rights reserved. 
 * This program is made available under the terms of the 
 * Eclipse Public License v1.0 which accompanies this distribution, 
 * and is available at http://www.eclipse.org/legal/epl-v10.html 
 * //from w  w w. j av  a2  s.c o m
 * Contributors: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/

import java.net.URI;
import java.net.URISyntaxException;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static final String SCHEME_SEPARATOR = "://";
    private static final Pattern SIMPLE_QUASI_URL_PATTERN = Pattern
            .compile("^((\\w+:/)?(/*)?(.*@)?)([^:|/]*)(.*)?$");

    public static String getHost(String url) {
        if (isEmpty(url)) {
            return url;
        }
        String host = null;
        if (url.contains(SCHEME_SEPARATOR)) {
            try {
                host = new URI(url).getHost();
            } catch (URISyntaxException ignored) {
            }
        }

        if (host == null) {
            Matcher m = SIMPLE_QUASI_URL_PATTERN.matcher(url);
            if (m.find()) {
                host = m.group(5);
            }
        }
        return host;
    }

    private static boolean isEmpty(String string) {
        return string == null || string.isEmpty();
    }
}

Related

1. getHost(String url)
2. getHost(String url)
3. getHost(String url)
4. getHost(String url)
5. getHost(String urlString)
6. getHost(String urlString)
7. getHost(URL url)