The jdom appears strange network access

Struts2 with jdom parsing a configuration file of the code, the recent exception of the inexplicably cast. Look completely abnormal to play not on the eight-pole, how the local connection will have network connectivity

java**.ConnectException: Connection timed out: connect
        at java**.PlainSocketImpl.socketConnect(Native Method)
        at java**.PlainSocketImpl.doConnect(Unknown Source)
        at java**.PlainSocketImpl.connectToAddress(Unknown Source)
        at java**.PlainSocketImpl.connect(Unknown Source)
        at java**.SocksSocketImpl.connect(Unknown Source)
        at java**.Socket.connect(Unknown Source)
        at java**.Socket.connect(Unknown Source)
        at sun**.NetworkClient.doConnect(Unknown Source)
        at sun**.**http.HttpClient.openServer(Unknown Source)
        at sun**.**http.HttpClient.openServer(Unknown Source)
        at sun**.**http.HttpClient.<init>(Unknown Source)
        at sun**.**http.HttpClient.New(Unknown Source)
        at sun**.**http.HttpClient.New(Unknown Source)
        at sun**.**protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
        at sun**.**protocol.http.HttpURLConnection.plainConnect(Unknown Source)
        at sun**.**protocol.http.HttpURLConnection.connect(Unknown Source)
        at sun**.**protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)
        at com.sun**.apache.xerces.internal.impl.XMLDocumentScannerImpl$ Source)
        at com.sun**.apache.xerces.internal.impl.XMLDocumentScannerImpl$ Source)
        at com.sun** Source)
        at com.sun** Source)
        at com.sun**.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at com.sun**.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
        at com.sun**.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
        at com.sun**.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
        at com.sun**.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
        at com.sun**.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at xml.UrlFetcher.main(

Suihou guess the problem may be here, xml configuration, there is a Waibu dtd Define , jdom in the process of parsing the default reads the xml file in the dtd, so if the url format is outside the Wang visit will Chansheng. The most recent addition to the domestic gfw, the company on the gfw, all external network requests is a tragedy. .

<?xml version="1.0" encoding="GBK"?>
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

So here more miserable, and turned a jdom document, just do not know where to remove as a result of network access dtd. So baidu, google, the final enlightenment: (that is, so the following is my comment out of line)

                  Document doc;
                        Element root; 
                        SAXBuilder builder = new SAXBuilder();
                        //builder.setFeature("**apache**/xml/features/nonvalidating/load-external-dtd", false);
                        try {
                                doc = File(filename));
                                root = doc.getRootElement();

                                Element packageN = (Element) XPath.selectSingleNode(root, "//package");
                                String namespace = packageN.getAttribute("namespace").getValue();
                                System.out.println("   namespace:"+namespace);
                                List actions = XPath.selectNodes(root, "//action");
                                Iterator iter = actions.iterator();
                                while (iter.hasNext()) {
                                        Element rule = (Element);
                                        String action = rule.getAttribute("name").getValue();
                                        //System.out.println("     actionName:"+action);
                                        // All of the url list  , Haha  
                        } catch (JDOMException e) {
                        } catch (IOException e) {

Why so amazing? Fill **apache**/xml/features/nonvalidating/load-external-dtd not have a problem.

1. According to the above long error stack, locate the problem in com.sun**.apache.xerces.internal.jaxp.SAXParserImpl here.

2. First class search inside look nonvalidating, found to be

    /** Feature identifier: XInclude processing */
    private static final String XINCLUDE_FEATURE = 

3. And then look for it above the field of reference: found this method:

     * Gets the XInclude processing mode for this parser
     * @return the state of XInclude processing mode
    public boolean isXIncludeAware() {
        try {
            return xmlReader.getFeature(XINCLUDE_FEATURE);
        catch (SAXException exc) {
            return false;

4. And then see a reference to this method and found that the realization of the parser inside! That given the established uri, will disable the dtd download


   SAXParserImpl(SAXParserFactoryImpl spf, Hashtable features, boolean secureProcessing)
        throws SAXException
        // Instantiate a SAXParser directly and not through SAX so that we use the right ClassLoader
        xmlReader = new JAXPSAXParser(this);
        // JAXP default is false while SAX 2 default is true!
        xmlReader.setFeature0(NAMESPACES_FEATURE, spf.isNamespaceAware());
        // SAX "namespaces" and "namespace-prefixes" features should not
        // both be false.  We make them opposite for backward compatibility
        // since JAXP 1.0 apps may want to receive xmlns* attributes.
        xmlReader.setFeature0(NAMESPACE_PREFIXES_FEATURE, !spf.isNamespaceAware());
        // Avoid setting the XInclude processing feature if the value is false.
        // This will keep the configuration from throwing an exception if it
        // does not support XInclude.
        if (spf.isXIncludeAware()) {
            xmlReader.setFeature0(XINCLUDE_FEATURE, true);


ow do I keep the DTD from loading? Even when I turn off validation the parser tries to load the DTD file.

Even when validation is turned off, an XML parser will by default load the external DTD file in order to parse the DTD for external entity declarations. Xerces has a feature to turn off this behavior named "**apache**/xml/ features / nonvalidating / load-external-dtd "and if you know you're using Xerces you can set this feature on the builder.

builder.setFeature (
"Http://apache**/xml/features/nonvalidating/load-external-dtd", false);

If you're using another parser like Crimson, your best bet is to set up an EntityResolver that resolves the DTD without actually reading the separate file.

import org.xml.sax .*;
import *;

public class NoOpEntityResolver implements EntityResolver (
public InputSource resolveEntity (String publicId, String systemId) (
return new InputSource (new StringBufferInputStream (""));

Then in the builder

builder.setEntityResolver (new NoOpEntityResolver ());

There is a downside to this approach. Any entities in the document will be resolved to the empty string, and will effectively disappear. If your document has entities, you need to setExpandEntities (false) code and ensure the EntityResolver only suppresses the DocType.
标签: impl, lt, configuration file, sun, network connectivity, unknown source, jdom, apache xerces, local connection, www protocol
分类: Java
时间: 2010-08-19


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