CanCeylan CanCeylan - 1 month ago 20
HTML Question

Parse Web Site HTML with JAVA

I want to parse a simple web site and scrape information from that web site.

I used to parse XML files with DocumentBuilderFactory, i tried to do the same thing for the html file but it always get into an infinite loop.

URL url = new URL("http://www.deneme.com");
URLConnection uc = url.openConnection();

InputStreamReader input = new InputStreamReader(uc.getInputStream());
BufferedReader in = new BufferedReader(input);
String inputLine;

FileWriter outFile = new FileWriter("orhancan");
PrintWriter out = new PrintWriter(outFile);

while ((inputLine = in.readLine()) != null) {
out.println(inputLine);
}

in.close();
out.close();

File fXmlFile = new File("orhancan");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);


NodeList prelist = doc.getElementsByTagName("body");
System.out.println(prelist.getLength());


Whats is the problem? Or is there any easier way to scrape data from a web site for a given html tag?

Answer

There is a much easier way to do this. I suggest using JSoup. With JSoup you can do things like

Document doc = Jsoup.connect("http://en.wikipedia.org/").get();
Elements newsHeadlines = doc.select("#mp-itn b a");

Or if you want the body:

Elements body = doc.select("body");

Or if you want all links:

Elements links = doc.select("body a");

You no longer need to get connections or handle streams. Simple. If you have ever used jQuery then it is very similar to that.

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