/**
* 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.localdata;
import org.apache.http.HttpStatus;
import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.fetcher.PageFetchResult;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.parser.HtmlParseData;
import edu.uci.ics.crawler4j.parser.ParseData;
import edu.uci.ics.crawler4j.parser.Parser;
import edu.uci.ics.crawler4j.url.WebURL;
/**
* This class is a demonstration of how crawler4j can be used to download a
* single page and extract its title and text.
*/
public class Downloader {
private Parser parser;
private PageFetcher pageFetcher;
public Downloader() {
CrawlConfig config = new CrawlConfig();
parser = new Parser(config);
pageFetcher = new PageFetcher(config);
}
private Page download(String url) {
WebURL curURL = new WebURL();
curURL.setURL(url);
PageFetchResult fetchResult = null;
try {
fetchResult = pageFetcher.fetchHeader(curURL);
if (fetchResult.getStatusCode() == HttpStatus.SC_OK) {
try {
Page page = new Page(curURL);
fetchResult.fetchContent(page);
if (parser.parse(page, curURL.getURL())) {
return page;
}
} catch (Exception e) {
e.printStackTrace();
}
}
} finally {
fetchResult.discardContentIfNotConsumed();
}
return null;
}
public void processUrl(String url) {
System.out.println("Processing: " + url);
Page page = download(url);
if (page != null) {
ParseData parseData = page.getParseData();
if (parseData != null) {
if (parseData instanceof HtmlParseData) {
HtmlParseData htmlParseData = (HtmlParseData) parseData;
System.out.println("Title: " + htmlParseData.getTitle());
System.out.println("Text length: " + htmlParseData.getText().length());
System.out.println("Html length: " + htmlParseData.getHtml().length());
}
} else {
System.out.println("Couldn't parse the content of the page.");
}
} else {
System.out.println("Couldn't fetch the content of the page.");
}
System.out.println("==============");
}
public static void main(String[] args) {
Downloader downloader = new Downloader();
downloader.processUrl("http://en.wikipedia.org/wiki/Main_Page/");
downloader.processUrl("http://www.yahoo.com/");
}
}