java 獲取域名

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


public class Test {

	public static void main(String arg[]){
		String str="http://33.google.cn/search?q=%E4%B8%96%E5%8D%9A%E8%AE%A2%E6%88%BF%E7%BD%91&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:zh-CN:official&client=firefox-a";
		Pattern pattern= Pattern.compile("\\w+(\\.\\w+){1,}");
		
		Matcher matcher=pattern.matcher(str);
		
		while(matcher.find()) {
			String group = matcher.group();
			System.out.println(group);
		}
	}
}