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POBuilding Wikipedia query forms in java using jena
 

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  1. POBuilding Wikipedia query forms in java using jena
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    <pre><code>#!/usr/local/bin/python import sys sys.path.append('/usr/home/bobd/lib/python/') # needed for hosted version from SPARQLWrapper import SPARQLWrapper, JSON import string import urllib import cgi def main(): form = cgi.FieldStorage() dir1name = form.getvalue('dir1') dir2name = form.getvalue('dir2') sparql = SPARQLWrapper("http://data.linkedmdb.org/sparql") queryString = """ PREFIX m: &lt;http://data.linkedmdb.org/resource/movie/&gt; SELECT DISTINCT ?actorName WHERE { ?dir1 m:director_name "DIR1-NAME". ?dir2 m:director_name "DIR2-NAME". ?dir1film m:director ?dir1; m:actor ?actor. ?dir2film m:director ?dir2; m:actor ?actor. ?actor m:actor_name ?actorName. } """ queryString = queryString.replace("DIR1-NAME",dir1name) queryString = queryString.replace("DIR2-NAME",dir2name) sparql.setQuery(queryString) sparql.setReturnFormat(JSON) try: ret = sparql.query() results = ret.convert() requestGood = True except Exception, e: results = str(e) requestGood = False print """Content-type: text/html &lt;html&gt; &lt;head&gt; &lt;title&gt;results&lt;/title&gt; &lt;link href="simple.css" type="text/css" rel="stylesheet" /&gt; &lt;/head&gt; &lt;body&gt; """ if requestGood == False: print "&lt;h1&gt;Problem communicating with the server&lt;/h1&gt;" print "&lt;p&gt;" + results + "&lt;/p&gt;" elif (len(results["results"]["bindings"]) == 0): print "&lt;p&gt;No results found.&lt;/p&gt;" else: for result in results["results"]["bindings"]: print "&lt;p&gt;" + result["actorName"]["value"] + "&lt;/p&gt;" print "&lt;/body&gt;&lt;/html&gt;" main() </code></pre> <p>i got the above code from <a href="http://www.ibm.com/developerworks/xml/library/x-wikiquery/#download" rel="nofollow">http://www.ibm.com/developerworks/xml/library/x-wikiquery/#download</a> </p> <p>Now,i want to do the same thing in java with servlets instead of cgi script.</p> <p>so,how do i pass the query from servlet to <a href="http://data.linkedmdb.org/sparql" rel="nofollow">http://data.linkedmdb.org/sparql</a> endpoint using jena ?</p> <p>and how should i get the result back and display it in a html form ?</p> <p>PLease,HELP</p>
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