RSS autodetect
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RSS autodetect
by richiebabes
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Re: RSS autodetect
by Martin Kurz
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Re: RSS autodetect
by Joseph Ottinger
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RE: RSS autodetect
by Nick Lothian
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Here’s some quick & dirty code to do this. You’ll need tagsoup:
public
static String findRssFeedOnWebpage(String url,
int timeoutMillis) { String rssFeedUrl =
null;
try {
//Make a request to the web page looking for
// <link
ref="alternate" type="application/rss+xml" href="wherever web site is" /> GetMethod getMethod =
new GetMethod(url); getMethod.setRequestHeader("Accept",
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); getMethod.setRequestHeader("Accept-Charset",
"ISO-8859-1,utf-8;q=0.7,*;q=0.7");
HttpClient httpClient =
new HttpClient(); httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(timeoutMillis); httpClient.getHttpConnectionManager().getParams().setSoTimeout(timeoutMillis);
if (httpClient.executeMethod(getMethod) > 0) {
final SAXException STOP_PARSING =
new SAXException("Found
rss feed, terminating parsing");
final String[] hrefBox =
new String[1]; DefaultHandler rssFinder =
new DefaultHandler() {
@Override
public
void startElement( String uri, String localName, String name, Attributes attributes)
throws SAXException {
if ("link".equals(localName)
&& ("application/rss+xml".equals(attributes.getValue("type"))
|| "application/atom+xml".equals(attributes.getValue("type")))
&&
"alternate".equals(attributes.getValue("rel")))
{
hrefBox[0] = attributes.getValue("href");
throw STOP_PARSING; } }
// tag has to be in head, so once we're done looking in head stop processing
@Override
public
void endElement( String uri, String localName, String name)
throws SAXException {
if ("head".equals(localName))
{
throw STOP_PARSING; } } }; SAXParser sp = SAXParserFactoryImpl.newInstance("org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl",Thread.currentThread().getContextClassLoader()).newSAXParser(); InputStream is =
new BufferedInputStream(getMethod.getResponseBodyAsStream());
try { sp.parse(is, rssFinder); }
catch (SAXException e) {
if (e != STOP_PARSING) {
//STOP_PARSING is just an
optimisation, nothing to worry about
throw e; } }
finally { is.close(); }
if (hrefBox[0] !=
null) { rssFeedUrl = hrefBox[0];
LOG.debug("Found RSS element
found in " + url +
" of " + rssFeedUrl); }
else {
LOG.debug("No RSS element
found in " + url); } } }
catch (Exception e) {
LOG.warn("Error when trying
to derive RSS feed from " + url, e); }
return rssFeedUrl; }
From: dreamreal@... [mailto:dreamreal@...]
On Behalf Of Joseph Ottinger ROME doesn't autodetect RSS feed urls. Jakarta's feedparser had code to do it, but I haven't been able to find feedparser's code anywhere. On Fri, Jul 3, 2009 at 1:39 PM, richiebabes <rich.g.morgan@...> wrote:
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