How to parse a xhtml ignoring the DOCTYPE declaration using DOM parser
I face issue parsing xhtml with DOCTYPE declaration using DOM parser.
Error: java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd%20
Declaration: DOCTYPE h开发者_StackOverflow中文版tml PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
Is there a way to parse the xhtml to a Document object ignoring the DOCTYPE declaration.
A solution that works for me is to give the DocumentBuilder a fake Resolver that returns an empty stream. There's a good explanation here (look at the last message from kdgregory)
http://forums.sun.com/thread.jspa?threadID=5362097
here's kdgregory's solution:
documentBuilder.setEntityResolver(new EntityResolver()
{
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException, IOException
{
return new InputSource(new StringReader(""));
}
});
The parser is required to download the DTD, but you may get around it by setting the standalone attribute on the <?xml... ?> line.
Note however, that this particular error is most likely triggered by a confusion between XML Schema definitions and DTD URL's. See http://www.w3schools.com/xhtml/xhtml_dtd.asp for details. The right one is:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
The easiest thing to do is to set validating=false in your DocumentBuilderFactory. If you want to do validation, download the DTD and use a local copy. As commented by Rachel above, this is discussed at The WWW Consortium.
In short, because the default DocumentBuilderFactory downloads the DTD every time it validates, the W3 was getting hit every time a typical programmer tried to parse an XHTML file in Java. They can't afford that much traffic, so they respond with an error.
Instead of the fake resolver, the following code snippet instructs the parser to really ignore the external DTD from the DOCTYPE declaration:
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
(...)
DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
f.setValidating(false);
f.setAttribute("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
DocumentBuilder builder = f.newDocumentBuilder();
Document document = builder.parse( ... )
加载中,请稍侯......
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