java - How to retrieve specific information from a certain website? -

i developing java web application , want know how take field (table and/or output-text) value website. assuming component has same id know how can retrieve information? don't know if has ever faced issue if has idea please share. thank you.

in general: 1.) retrieve pages markup reading through httpconnection url in application 2.) parse markup using framework jsoup , retrieve value need.

more specifically, here example code jsoup:

httpclient http = new defaulthttpclient(); string htmlcode = ""; httpget request = new httpget("http://www.example.com"); httpresponse response = null; try {     response = http.execute(request); } catch (clientprotocolexception e) {     e.printstacktrace(); } catch (ioexception e) {     e.printstacktrace(); } if(response != null){     bufferedreader read = new bufferedreader(new inputstreamreader(response.getentity().getcontent()));      string line = "";     while((line = read.readline()) != null){         htmlcode += line;      } } // @ point have pages markup document doc = jsoup.parse(htmlcode); elements lis = doc.getelementsbytag("li"); // entries in lists for(element el : lis){     string val = el.text().trim();     // each list entry }