java获取URL中的*域名domain

此类提供了获取url的*域名和判断两个url的*域名是否相等，可直接使用。

import ;
import ;
import ;
import ;
import ;
import ;

public class URLUtil {

	private final static Set<String> PublicSuffixSet = new HashSet<String>(
			(new String(
					"com|org|net|gov|edu|co|tv|mobi|info|asia|xxx|onion|cn||||||jp|kr|tw||hk|||se||")
					.split("\\|")));

	private static Pattern IP_PATTERN = Pattern
			.compile("(\\d{1,3}\\.){3}(\\d{1,3})");

	/**
	 * 获取url的*域名
	 * @param url
	 * @return
	 */
	public static String getDomainName(URL url) {
		String host = ();
		if (("."))
			host = (0, () - 1);
		if (IP_PATTERN.matcher(host).matches())
			return host;

		int index = 0;
		String candidate = host;
		for (; index >= 0;) {
			index = ('.');
			String subCandidate = (index + 1);
			if ((subCandidate)) {
				return candidate;
			}
			candidate = subCandidate;
		}
		return candidate;
	}

	/**
	 * 获取url的*域名
	 * @param url
	 * @return
	 * @throws MalformedURLException
	 */
	public static String getDomainName(String url) throws MalformedURLException {
		return getDomainName(new URL(url));
	}

	/**
	 * 判断两个url*域名是否相等
	 * @param url1
	 * @param url2
	 * @return
	 */
	public static boolean isSameDomainName(URL url1, URL url2) {
		return getDomainName(url1).equalsIgnoreCase(getDomainName(url2));
	}

	/**
	 * 判断两个url*域名是否相等
	 * @param url1
	 * @param url2
	 * @return
	 * @throws MalformedURLException
	 */
	public static boolean isSameDomainName(String url1, String url2)
			throws MalformedURLException {
		return isSameDomainName(new URL(url1), new URL(url2));
	}

}