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BasicCrawler.java
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BasicCrawler.java
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package edu.uci.ics.crawler4j.examples.shutdown;
import java.util.Set;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.parser.HtmlParseData;
import edu.uci.ics.crawler4j.url.WebURL;
/**
* @author Yasser Ganjisaffar
*/
public class BasicCrawler extends WebCrawler {
private static final Logger logger = LoggerFactory.getLogger(BasicCrawler.class);
private static final Pattern FILTERS = Pattern.compile(
".*(\\.(css|js|bmp|gif|jpe?g|png|tiff?|mid|mp2|mp3|mp4|wav|avi|mov|mpeg|ram|m4v|pdf" +
"|rm|smil|wmv|swf|wma|zip|rar|gz))$");
private static final String DOMAIN = "https://www.ics.uci.edu/";
@Override
public boolean shouldVisit(Page referringPage, WebURL url) {
String href = url.getURL().toLowerCase();
return !FILTERS.matcher(href).matches() && href.startsWith(DOMAIN);
}
@Override
public void visit(Page page) {
int docid = page.getWebURL().getDocid();
String url = page.getWebURL().getURL();
int parentDocid = page.getWebURL().getParentDocid();
logger.debug("Docid: {}", docid);
logger.info("URL: {}", url);
logger.debug("Docid of parent page: {}", parentDocid);
if (page.getParseData() instanceof HtmlParseData) {
HtmlParseData htmlParseData = (HtmlParseData) page.getParseData();
String text = htmlParseData.getText();
String html = htmlParseData.getHtml();
Set<WebURL> links = htmlParseData.getOutgoingUrls();
logger.debug("Text length: {}", text.length());
logger.debug("Html length: {}", html.length());
logger.debug("Number of outgoing links: {}", links.size());
}
logger.debug("=============");
}
}