Extract links from html

The LinksExtractor is a simple program that can help you extract all links from an html web page. It is easy to use. When the input box displays, type or paste the address of any html web page to the box. Then click OK to begin links extracting process. The result links are stored in a text file called Links.txt in your current working folder.
The Apache Tika is the most important library used in th program. For more information about Apache Tika, you may need to visit its website. The website link can be found in the references list at the right side bar of this page.

LinksExtractor source code:

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import javax.swing.JOptionPane;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.sax.Link;
import org.apache.tika.sax.LinkContentHandler;
import org.xml.sax.SAXException;

public class LinksExtractor{

public static void main(String[] args){


try {
String address=JOptionPane.showInputDialog("Web page address:");
if(address!=null)
extractLinks(address,System.getProperty("user.dir")+"/links.txt");

} catch (Exception e) {

e.printStackTrace();
}


}

public static void extractLinks(String src, String desc) throws IOException, SAXException, TikaException{
BufferedWriter bw=null;

try{
//create stream read to read data from the url
InputStream f=TikaInputStream.get(new URL(src).openStream());
//create buffered writer to write extracted links to the file
bw=new BufferedWriter(new FileWriter(desc));
//create metadata to store the metadata of the web page
Metadata meta=new Metadata();
//create linkcontent hander to store the extracted links
LinkContentHandler linkhandler=new LinkContentHandler();
//create a parser to parse the web page file
AutoDetectParser parser=new AutoDetectParser();
//now parse the web page
parser.parse(f, linkhandler, meta);
//get links from the handler and write them to the file
List<Link> links=linkhandler.getLinks();
Iterator<Link> i=links.iterator();
while(i.hasNext()){
bw.write(i.next().toString());
bw.newLine();
}
}
//close the buffered writer
finally{
bw.flush();
bw.close();
}



}


}