网页爬虫

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class NetSpider {

    public static void main(String[] args) throws IOException {
        
        //将文件封装成File对象
        File file = new File("mailTo.txt");
        
        String regex = "\w+@\w+(\.\w+)+";
        
        List<String> mailList = getMails(file,regex);
        
        for(String mail:mailList){
            System.out.println(mail);
        }
    }

    public static List<String> getMails(File file,String regex) throws IOException {
        
        
        //1.先读取数据
        BufferedReader bufr = new BufferedReader(new FileReader(file));
        
        //2.将正则封装成对象
        Pattern p = Pattern.compile(regex);
        
        //3.定义list集合
        List<String> list = new ArrayList<String>();
        
        String line = null;
        while((line=bufr.readLine())!=null){
            Matcher m = p.matcher(line);
            
            while(m.find()){
                list.add(m.group());
            }
            
        }
        
        return list;
    }

}