package com.fpcms.common.webcrawler;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import java.util.Arrays;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
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.BinaryParseData;
import edu.uci.ics.crawler4j.url.WebURL;
/**
* @author Yasser Ganjisaffar <lastname at gmail dot com>
*/
/*
* This class shows how you can crawl images on the web and store them in a
* folder. This is just for demonstration purposes and doesn't scale for large
* number of images. For crawling millions of images you would need to store
* downloaded images in a hierarchy of folders
*/
public class ImageCrawler extends WebCrawler {
private static final Pattern filters = Pattern
.compile(".*(\\.(css|js|mid|mp2|mp3|mp4|wav|avi|mov|mpeg|ram|m4v|pdf"
+ "|rm|smil|wmv|swf|wma|zip|rar|gz))$");
private static final Pattern imgPatterns = Pattern
.compile(".*(\\.(gif|jpe?g|png?))$");
private static File storageFolder;
private static String[] crawlDomains;
private static Logger logger = LoggerFactory.getLogger(ImageCrawler.class);
private static PrintWriter storedImagesUrl = new PrintWriter(getFileWriter(),true);
private static FileWriter getFileWriter() {
try {
return new FileWriter("/tmp/storedImagesUrl.txt",true);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static void configure(String[] crawlDomains, String storageFolderName) {
System.out.println("ImageCrawler.configure,crawlDomains:"+Arrays.toString(crawlDomains));
ImageCrawler.crawlDomains = crawlDomains;
storageFolder = new File(storageFolderName);
if (!storageFolder.exists()) {
storageFolder.mkdirs();
}
}
@Override
public boolean shouldVisit(WebURL url) {
String href = url.getURL().toLowerCase();
if (filters.matcher(href).matches()) {
return false;
}
if (imgPatterns.matcher(href).matches()) {
return true;
}
for (String domain : crawlDomains) {
if (href.startsWith(domain)) {
// logger.debug("shouldVisit() url:{}",url);
return true;
}
}
return false;
}
@Override
public void visit(Page page) {
String url = page.getWebURL().getURL();
// logger.debug("visit(Page) url:{}",url);
// We are only interested in processing images
if (!(page.getParseData() instanceof BinaryParseData)) {
return;
}
if (!imgPatterns.matcher(url).matches()) {
return;
}
// Not interested in very small images
if (page.getContentData().length < 45 * 1024) {
return;
}
// get a unique name for storing this image
String extension = url.substring(url.lastIndexOf("."));
try {
BufferedImage image = ImageIO.read(new ByteArrayInputStream(page.getContentData()));
int width = image.getWidth();
int height = image.getHeight();
if(width > 500 || height > 500) {
String hashedName = new URL(url).getFile() + extension;
// store image
// IO.writeBytesToFile(page.getContentData(),
// storageFolder.getAbsolutePath() + "/" + hashedName);
System.out.println("Stored: " + url+" width:"+width+" height:"+height);
storedImagesUrl.println(url);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}