I'm trying to execute the crawler4j in a personal redmine for testing purposes. I want to authenticate and crawl several leves of depth in the application.
I follow this tutorial from the FAQ of crawler4j. And create the next snippet:
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;
public class CustomWebCrawler extends WebCrawler{
@Override
public void visit(final Page pPage) {
if (pPage.getParseData() instanceof HtmlParseData) {
System.out.println("URL: " + pPage.getWebURL().getURL());
}
}
@Override
public boolean shouldVisit(final Page pPage, final WebURL pUrl) {
WebURL webUrl = new WebURL();
webUrl.setURL(Test.URL_LOGOUT);
if (pUrl.equals(webUrl)) {
return false;
}
if(Test.MY_REDMINE_HOST.equals(pUrl.getDomain())){
return true;
}
return false;
}
}
In this class I extend from WebCrawler and in every visit, just show the URL visit, checking if the URL is in the same domain, and don't visit the logout URL.
And also I have a testing class configuring this crawler, with the authentication info and the site to crawl.
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.CrawlController;
import edu.uci.ics.crawler4j.crawler.authentication.AuthInfo;
import edu.uci.ics.crawler4j.crawler.authentication.BasicAuthInfo;
import edu.uci.ics.crawler4j.crawler.authentication.FormAuthInfo;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer;
public class Test {
private static Logger rootLogger;
public final static String MY_REDMINE_HOST = "my-redmine-server";
public final static String URL_LOGOUT = "http://"+MY_REDMINE_HOST+"/redmine/logout";
public static void main(String[] args) throws Exception {
configureLogger();
// Create the configuration
CrawlConfig config = new CrawlConfig();
String frontier = "/tmp/webCrawler/tmp_" + System.currentTimeMillis();
config.setCrawlStorageFolder(frontier);
//Starting point to crawl
String seed = "http://"+MY_REDMINE_HOST+"/redmine/";
// Data for the authentication methods
String userName = "my-user";
String password = "my-passwd";
String urlLogin = "http://"+MY_REDMINE_HOST+"/redmine/login";
String nameUsername = "username";
String namePassword = "password";
AuthInfo authInfo1 = new FormAuthInfo(userName, password, urlLogin,
nameUsername, namePassword);
config.addAuthInfo(authInfo1);
AuthInfo authInfo2 = new BasicAuthInfo(userName, password, urlLogin);
config.addAuthInfo(authInfo2);
config.setMaxDepthOfCrawling(3);
PageFetcher pageFetcher = new PageFetcher(config);
RobotstxtConfig robotstxtConfig = new RobotstxtConfig();
RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig,
pageFetcher);
CrawlController controller = new CrawlController(config, pageFetcher,
robotstxtServer);
controller.addSeed(seed);
controller.start(CustomWebCrawler.class, 5);
controller.shutdown();
}
private static void configureLogger() {
// This is the root logger provided by log4j
rootLogger = Logger.getRootLogger();
rootLogger.setLevel(Level.INFO);
// Define log pattern layout
PatternLayout layout = new PatternLayout(
"%d{ISO8601} [%t] %-5p %c %x - %m%n");
// Add console appender to root logger
if (!rootLogger.getAllAppenders().hasMoreElements()) {
rootLogger.addAppender(new ConsoleAppender(layout));
}
}
}
I was expecting to login in the application and keep the crawl in the rest of the site, but I couldn't. The crawl just visit the links in the starting point.
I don't know if something is missing or there is anything wrong. Or maybe I'm having a wrong approach with the current configuration of the crawl.