StatusHandlerCrawler.java

/**
 * 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.statushandler;

import java.util.regex.Pattern;

import org.apache.http.HttpStatus;

import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.url.WebURL;

/**
 * @author Yasser Ganjisaffar <lastname at gmail dot com>
 */
public class StatusHandlerCrawler extends WebCrawler {

	private final static 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))$");

	/**
	 * You should implement this function to specify whether
	 * the given url should be crawled or not (based on your
	 * crawling logic).
	 */
	@Override
	public boolean shouldVisit(WebURL url) {
		String href = url.getURL().toLowerCase();
		return !FILTERS.matcher(href).matches() && href.startsWith("http://www.ics.uci.edu/");
	}

	/**
	 * This function is called when a page is fetched and ready 
	 * to be processed by your program.
	 */
	@Override
	public void visit(Page page) {
		// Do nothing
	}
	
	@Override
	protected void handlePageStatusCode(WebURL webUrl, int statusCode, String statusDescription) {
		
		if (statusCode != HttpStatus.SC_OK) {

			if (statusCode == HttpStatus.SC_NOT_FOUND) {
				System.out.println("Broken link: " + webUrl.getURL() + ", this link was found in page: " + webUrl.getParentUrl());
			} else {
				System.out.println("Non success status for link: " + webUrl.getURL() + ", status code: " + statusCode + ", description: " + statusDescription);
			}
			
		}
		
	}
	
}