DTD download error while parsing XHTML document in XOM
I am trying to parse an HTML document with the doctype declared to use the transitional dtd as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
When I do Builder.build on the document, I get the following exception:
java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1305)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at nu.xom.Builder.build(Builder.java:1127)
at nu.xom.Builder.build(Builder.java:1019)
If I remove the doc type declaration, it parses just fine. I can successfully download the dtd from my browser, which tells me that the url is valid. I don't want to remove the doc type declaration. Is there a way tell the builder not to download the dtd or provide it with an alternate dtd?
Taking a quick look at the javadoc for Builder, I guess you could provide an EntityResolver via the constructor that takes a XMLReader. I would avoid letting the parser download files from the internet where possible.
这解决了这个问题：
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(false);
factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
Document document = factory.newDocumentBuilder().parse(is);
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