JAVA爬取网页邮箱

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 爬取网站上的邮箱
 * https://book.douban.com/subject/24753651/discussion/58975313
 * @author He
 */

public class GetEmail {
    public static void main(String[] args) throws Exception {
        //实例化URL类
        URL url=new URL("https://book.douban.com/subject/24753651/discussion/58975313");
        //取得链接
        URLConnection conn = url.openConnection();
        //取得网页数据
        BufferedReader bufIn = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        //声明循环结束标记
        String line=null;
        //声明正则
        String emailReg="\\w+@\\w+(\\.\\w+)+";
        //将正则表达式封装成对象patttern
        Pattern p = Pattern.compile(emailReg);
        //循环读取网页数据
        while ((line=bufIn.readLine())!=null){
            //让正则对象和要操作的数据相关联，获取正则匹配引擎。
            Matcher m = p.matcher(line);
            //循环查询匹配
            while (m.find()){
                //打印匹配后的结果
                System.out.println(m.group());
            }
        }
    }
}