Java爬虫抓取视频网站下载链接

package action;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class VideoLinkGrab {
 
  public static void main(String[] args) {
    VideoLinkGrab videoLinkGrab = new VideoLinkGrab();
    videoLinkGrab.saveData("http://www.80s.la/movie/list/-2015----p");
  }
 
  /**
   * 将获取到的数据保存在数据库中
   * 
   * @param baseUrl
   *      爬虫起点
   * @return null
   * */
  public void saveData(String baseUrl) {
    Map<String, Boolean> oldMap = new LinkedHashMap<String, Boolean>(); // 存储链接-是否被遍历
 
    Map<String, String> videoLinkMap = new LinkedHashMap<String, String>(); // 视频下载链接
    String oldLinkHost = ""; // host
 
    Pattern p = Pattern.compile("(https?://)?[^/\\s]*"); // 比如：http://www.zifangsky.cn
    Matcher m = p.matcher(baseUrl);
    if (m.find()) {
      oldLinkHost = m.group();
    }
 
    oldMap.put(baseUrl, false);
    videoLinkMap = crawlLinks(oldLinkHost, oldMap);
    // 遍历，然后将数据保存在数据库中
    try {
      Connection connection = JDBCDemo.getConnection();
      for (Map.Entry<String, String> mapping : videoLinkMap.entrySet()) {
        PreparedStatement pStatement = connection
            .prepareStatement("insert into movie(MovieName,MovieLink) values(?,?)");
        pStatement.setString(1, mapping.getKey());
        pStatement.setString(2, mapping.getValue());
        pStatement.executeUpdate();
        pStatement.close();
//       System.out.println(mapping.getKey() + " : " + mapping.getValue());
      }
      connection.close();
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
 
  /**
   * 抓取一个网站所有可以抓取的网页链接，在思路上使用了广度优先算法 对未遍历过的新链接不断发起GET请求， 一直到遍历完整个集合都没能发现新的链接
   * 则表示不能发现新的链接了，任务结束
   * 
   * 对一个链接发起请求时，对该网页用正则查找我们所需要的视频链接，找到后存入集合videoLinkMap
   * 
   * @param oldLinkHost
   *      域名，如：http://www.zifangsky.cn
   * @param oldMap
   *      待遍历的链接集合
   * 
   * @return 返回所有抓取到的视频下载链接集合
   * */
  private Map<String, String> crawlLinks(String oldLinkHost,
      Map<String, Boolean> oldMap) {
    Map<String, Boolean> newMap = new LinkedHashMap<String, Boolean>(); // 每次循环获取到的新链接
    Map<String, String> videoLinkMap = new LinkedHashMap<String, String>(); // 视频下载链接
    String oldLink = "";
 
    for (Map.Entry<String, Boolean> mapping : oldMap.entrySet()) {
      // System.out.println("link:" + mapping.getKey() + "--------check:"
      // + mapping.getValue());
      // 如果没有被遍历过
      if (!mapping.getValue()) {
        oldLink = mapping.getKey();
        // 发起GET请求
        try {
          URL url = new URL(oldLink);
          HttpURLConnection connection = (HttpURLConnection) url
              .openConnection();
          connection.setRequestMethod("GET");
          connection.setConnectTimeout(2500);
          connection.setReadTimeout(2500);
 
          if (connection.getResponseCode() == 200) {
            InputStream inputStream = connection.getInputStream();
            BufferedReader reader = new BufferedReader(
                new InputStreamReader(inputStream, "UTF-8"));
            String line = "";
            Pattern pattern = null;
            Matcher matcher = null;
            //电影详情页面，取出其中的视频下载链接，不继续深入抓取其他页面
            if(isMoviePage(oldLink)){
              boolean checkTitle = false;
              String title = "";
              while ((line = reader.readLine()) != null) {
                //取出页面中的视频标题
                if(!checkTitle){
                  pattern = Pattern.compile("([^\\s]+).*?</title>");
                  matcher = pattern.matcher(line);
                  if(matcher.find()){
                    title = matcher.group(1);
                    checkTitle = true;
                    continue;
                  }
                }
                // 取出页面中的视频下载链接
                pattern = Pattern
                    .compile("(thunder:[^\"]+).*thunder[rR]es[tT]itle=\"[^\"]*\"");
                matcher = pattern.matcher(line);
                if (matcher.find()) {
                  videoLinkMap.put(title,matcher.group(1));
                  System.out.println("视频名称： "
                      + title + " ------ 视频链接："
                      + matcher.group(1));
                  break; //当前页面已经检测完毕
                }
              } 
            }
            //电影列表页面
            else if(checkUrl(oldLink)){
              while ((line = reader.readLine()) != null) {
 
                pattern = Pattern
                    .compile("<a href=\"([^\"\\s]*)\"");
                matcher = pattern.matcher(line);
                while (matcher.find()) {
                  String newLink = matcher.group(1).trim(); // 链接
                  // 判断获取到的链接是否以http开头
                  if (!newLink.startsWith("http")) {
                    if (newLink.startsWith("/"))
                      newLink = oldLinkHost + newLink;
                    else
                      newLink = oldLinkHost + "/" + newLink;
                  }
                  // 去除链接末尾的 /
                  if (newLink.endsWith("/"))
                    newLink = newLink.substring(0,
                        newLink.length() - 1);
                  // 去重，并且丢弃其他网站的链接
                  if (!oldMap.containsKey(newLink)
                      && !newMap.containsKey(newLink)
                      && (checkUrl(newLink) || isMoviePage(newLink))) {
                    System.out.println("temp: " + newLink);
                    newMap.put(newLink, false);
                  }
                }
              }
            }
 
            reader.close();
            inputStream.close();
          }
          connection.disconnect();
        } catch (MalformedURLException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }
 
        try {
          Thread.sleep(1000);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
        oldMap.replace(oldLink, false, true);
      }
    }
    // 有新链接，继续遍历
    if (!newMap.isEmpty()) {
      oldMap.putAll(newMap);
      videoLinkMap.putAll(crawlLinks(oldLinkHost, oldMap)); // 由于Map的特性，不会导致出现重复的键值对
    }
    return videoLinkMap;
  }
   
  /**
   * 判断是否是2015年的电影列表页面
   * @param url 待检查URL
   * @return 状态
   * */
  public boolean checkUrl(String url){
    Pattern pattern = Pattern.compile("http://www.80s.la/movie/list/-2015----p\\d*");
    Matcher matcher = pattern.matcher(url);
    if(matcher.find())
      return true; //2015年的列表
    else
      return false;
  }
   
  /**
   * 判断页面是否是电影详情页面
   * @param url 页面链接
   * @return 状态
   * */
  public boolean isMoviePage(String url){
    Pattern pattern = Pattern.compile("http://www.80s.la/movie/\\d+");
    Matcher matcher = pattern.matcher(url);
    if(matcher.find())
      return true; //电影页面
    else 
      return false;
  }
   
}