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; 
  } 
}