Question

Using Java, how can I extract all the links from a given web page?

Answer 1

download java file as plain text/html pass it through Jsoup or html cleaner both are similar and can be used to parse even malformed html 4.0 syntax and then you can use the popular HTML DOM parsing methods like getElementsByName(“a”) or in jsoup its even cool you can simply use

File input = new File("/tmp/input.html");
 Document doc = Jsoup.parse(input, "UTF-8", "http://example.com/");

Elements links = doc.select("a[href]"); // a with href
Elements pngs = doc.select("img[src$=.png]");
// img with src ending .png

Element masthead = doc.select("div.masthead").first();

and find all links and then get the detials using

String linkhref=links.attr("href");

Taken from http://jsoup.org/cookbook/extracting-data/selector-syntax

The selectors have same syntax as jQuery if you know jQuery function chaining then you will certainly love it.

EDIT: In case you want more tutorials, you can try out this one made by mkyong.

http://www.mkyong.com/java/jsoup-html-parser-hello-world-examples/