Java Multi Link Checker Spider -需要改进

Question

我有以下工作代码(在这里和那里进行了更改，以便您在复制和粘贴时动动脑筋)。我想改进它，这样它就可以检测到所有无效的页面，包括出售的域名。它的工作效率约为89%。如果你看到任何东西，我可以通过使用其他现有的库或小调整来改进，这将是非常棒的。

 List all = linkService.getAllLinks();
    notValidLinks = new LinkedList();
    final ArrayBlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(39867);
    int poolSize = 90;
    int maxPoolSize = 100;
    long keepAliveTime = 40;
    ThreadPoolExecutor tpe = new ThreadPoolExecutor(poolSize, maxPoolSize,
            keepAliveTime, TimeUnit.SECONDS, queue);

    for (link : all) {
       Thread task = new CheckSite(link);
       tpe.execute(task);
       System.out.println("Task count:" + queue.size());
    }

class CheckSite extends Thread {
    Link link;

    CheckSite(Link link) {
        this.link = link;
    }

    public void run() {
        boolean notValid = false;
        try {
            log.info(link.getLink() + " " + link.getId());
            URL u = new URL(link.getLink());
            HttpURLConnection huc = (HttpURLConnection) u.openConnection();
            HttpURLConnection.setFollowRedirects(false);
            huc.setConnectTimeout(40000);
            huc.setRequestMethod("GET");
            huc.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)");

            huc.connect();
            int code = huc.getResponseCode();

            if (code != HttpURLConnection.HTTP_OK
                    && code != HttpURLConnection.HTTP_MOVED_PERM
                    && code != HttpURLConnection.HTTP_MOVED_TEMP ){
                notValid = true;
                log.info("Invalid code: " + code + " - " + link.getLink());
            }
            if (code == HttpURLConnection.HTTP_MOVED_PERM) {
                log.info(link.getLink() + " Perm move");
            }
            if (code == HttpURLConnection.HTTP_MOVED_TEMP) {
                log.info(link.getLink() + " Temp move");
            }

            try {
                if (!notValid) {
                    BufferedReader reader = new BufferedReader(new InputStreamReader(huc.getInputStream()));
                    StringBuilder stringBuilder = new StringBuilder();

                    String line;
                    while ((line = reader.readLine()) != null) {
                        stringBuilder.append(line);
                    }

                    notValid = StringUtils.containsIgnoreCase(Jsoup.parse(stringBuilder.toString()).text(), "Related Searches");

                }
            } catch (Exception e) {
                   log.error(e.getMessage());
            }

            huc.disconnect();
        } catch (MalformedURLException me) {
            log.info("Malformed URL:" + link.getLink());
            notValid = true;
        } catch (IOException e) {
            log.info("Refused connection | Does not exist:" + link.getLink());
            notValid = true;
        }
        if (notValid) {
            link.setApproved(false);
            link.setDateApproved(null);
            notValidLinks.add(linkService.save(link));

        }
        log.debug("URL Finieshed!");
    }
}

Answer 1

查看Bloom Filter [wiki].This将帮助您快速和内存高效地看布隆过滤器的问题是，它将误报，即ups.The。对于不是there.But的东西，它会告诉true，如果布隆过滤器说false，那肯定是false。

Answer 2

我想改进它，这样它就可以检测到所有无效的页面，包括出售的域名。

我怀疑突出显示的部分不切实际。蜘蛛是如何辨别域名是否出售的呢？

后续

@Mat Banik建议寻找特定的短语或检查DNS记录作为可能的解决方案。

检查特定短语的启发式方法会给出误报和错误的negatives.

• Checking 记录，这在
• 中是很棘手的。您可以对URL的主机名部分执行简单的DNS查找，并根据已知的DNS停车站点IP列表检查生成的IP地址。但这并不能告诉您原始主机名是否真的在出售。它可能是一个托管在相同基础设施上的真实站点...或非出售的驻留域名。

但是我想，如果你准备接受一些假阳性和阴性，那么尝试过滤掉出售的域名是可行的。