package cn.bdqn;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
//和网络相关的操作
import java.net.URL;
import java.net.URLConnection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 正则抓取邮箱
 * @author happy
 *
 */
public class Test {
 public static void main(String[] args) throws IOException {
  //1.1 创建一个url对象
  URL url = new URL("https://www.douban.com/group/topic/8845032/"); 
  //1.2 打开连接 
  URLConnection conn = url.openConnection(); 
  //1.3 设置连接网络超时时间 单位为毫秒
  conn.setConnectTimeout(1000 * 10); 
  //1.4 通过流 操作读取指定网络地址中的文件 
  BufferedReader bufr = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
  String line = null; 
  //1.5 匹配email的正则
  String regex = "[a-zA-Z0-9_-]+@\\w+\\.[a-z]+(\\.[a-z]+)?";
  //1.6 使用模式的compile()方法生成模式对象
  Pattern p = Pattern.compile(regex); 
  //1. 
  while((line = bufr.readLine()) != null) { 
   Matcher m = p.matcher(line); 
   while(m.find()) { 
    System.out.println(m.group());// 获得匹配的email 
   } 
  } 
 }
}