java 爬虫详解及简单实例

URL url = new URL(http://www.cnblogs.com/Renyi-Fan/p/6896901.html);

BufferedReader bufr = new BufferedReader(new InputStreamReader(url.openStream()));

tring mail_regex = "\\w+@\\w+(\\.\\w+)+";

List<String> list = new ArrayList<String>();

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
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 Spider {

  public static void main(String[] args) throws IOException {
//    List<String> list = getMails();
//    for(String mail : list){
//      System.out.println(mail);
//    }
  
    List<String> list = getMailsByWeb();
    for(String mail : list){
      System.out.println(mail);
    }
  }

  public static List<String> getMailsByWeb() throws IOException{
    //1,读取源文件。
    //URL url = new URL("http://192.168.1.100:8080/myweb/mail.html");
    //URL url = new URL("http://localhost:8080/SecondWeb/index.jsp");
    URL url = new URL("http://www.cnblogs.com/Renyi-Fan/p/6896901.html");

    BufferedReader bufr = new BufferedReader(new InputStreamReader(url.openStream()));


    //2,对读取的数据进行规则的匹配。从中获取符合规则的数据.
    String mail_regex = "\\w+@\\w+(\\.\\w+)+";

    List<String> list = new ArrayList<String>();

    Pattern p = Pattern.compile(mail_regex);
    String line = null;

    while((line=bufr.readLine())!=null){

      Matcher m = p.matcher(line);
      while(m.find()){
        //3,将符合规则的数据存储到集合中。
        list.add(m.group());
      }

    }
    return list;
  }

  public static List<String> getMails() throws IOException{
    //1,读取源文件。
    BufferedReader bufr = new BufferedReader(new FileReader("c:\\mail.html"));


    //2,对读取的数据进行规则的匹配。从中获取符合规则的数据.
    String mail_regex = "\\w+@\\w+(\\.\\w+)+";

    List<String> list = new ArrayList<String>();

    Pattern p = Pattern.compile(mail_regex);
    String line = null;

    while((line=bufr.readLine())!=null){

      Matcher m = p.matcher(line);
      while(m.find()){
        //3,将符合规则的数据存储到集合中。
        list.add(m.group());
      }

    }
    return list;
  }
}

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