利用Java怎么对邮箱进行爬取

package day05; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpiderDemo {   public static void main(String[] args) throws IOException {     List<String> list = getMailByWeb();     for (String mail : list) {       System.out.println(mail);     }   }   public static List<String> getMailByWeb() throws IOException {     URL url = new URL("http://www.itheima.com/aboutt/1376.html");     BufferedReader input = new BufferedReader(new InputStreamReader(url.openStream()));     String regex = "\\w+@\\w+(\\.\\w+)+";     Pattern p = Pattern.compile(regex);     List<String> list = new ArrayList<String>();     String line = null;     while ((line = input.readLine()) != null) {       Matcher m = p.matcher(line);       while (m.find()) {         list.add(m.group());       }     }     return list;   } }