我将使用java.net.URI类提取主机名，然后使用正则表达式提取主机uri的最后两个部分。
import java.net.URI;import java.net.URISyntaxException;import java.util.regex.Matcher;import java.util.regex.Pattern;public class RunIt { public static void main(String[] args) throws URISyntaxException { Pattern p = Pattern.compile(".*?([^.]+\.[^.]+)"); String[] urls = new String[] { "https://foo.com/bar", "http://www.foo.com#bar", "http://bar.foo.com" }; for (String url:urls) { URI uri = new URI(url); //eg: uri.getHost() will return "www.foo.com" Matcher m = p.matcher(uri.getHost()); if (m.matches()) { System.out.println(m.group(1)); } } }}印刷品：
foo.comfoo.comfoo.com
