Question

几个月来，我们使用crawler4j来抓取https网站。突然间，自上周五以来，我们无法抓取同一个https网站。 https协议有什么变化吗？该网站为https://enot.publicprocurement.be/enot-war/home.do

作为测试，只需尝试获取标题：Welkom op het platform e-Notification

非常感谢任何帮助。

Answer 1

我发现在设置CrawlConfig时效果最好

 CrawlConfig config = new CrawlConfig();
 config.setIncludeHttpsPages(true);
 config.setUserAgentString("Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36");
 PageFetcher pageFetcher = new PageFetcher(config);

Answer 2

我有同样的问题。要解决此问题，我们需要一个自定义的PageFetcher。你可以在这里找到样品。 http://code.google.com/p/crawler4j/issues/detail?id=174

Answer 3

您可以使用此PageFetcher子类代替PageFetcher。这解决了我的所有问题。

import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;

import javax.net.ssl.SSLContext;

import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;

public class PageFetcher2 extends PageFetcher {

public static final String DEFAULT_USER_AGENT = "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:45.0) Gecko/20100101 Firefox/45.0";
public static final RequestConfig DEFAULT_REQUEST_CONFIG = RequestConfig.custom().setConnectTimeout(30 * 1000)
        .setSocketTimeout(60 * 1000).build();

public PageFetcher2(CrawlConfig config) throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException {
    super(config);

    PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
    connectionManager.setMaxTotal(30);
    connectionManager.setDefaultMaxPerRoute(30);

    SSLContext sslContext = new SSLContextBuilder()
              .loadTrustMaterial(null, (certificate, authType) -> true).build();

    httpClient = HttpClients.custom()
              .setSSLContext(sslContext)
              .setSSLHostnameVerifier(new NoopHostnameVerifier())
              .setConnectionManager(connectionManager)
              .setUserAgent(DEFAULT_USER_AGENT)
              .setDefaultRequestConfig(DEFAULT_REQUEST_CONFIG)
              .build();
}

}

使用crawler4j抓取https页面

3 个答案: