Java 如何将支持XInclude的XMLReader链接到XMLFilter，以便对过滤器已更改的任何元素执行XInclude包含？

在海报中，我们想使用XInclude，但在

include

元素上使用了错误的名称空间。我认为，在XInclude感知解析器之前放置一个put，XMLFilter负责更正名称空间，可以解决这个问题（无需分别手动编辑文件，无需单独的处理步骤，首先创建具有更正名称空间的中间文件）

因此，我编写了以下

XMLFilter

，扩展了SAX提供的

XMLFilterImpl

：

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.XMLFilterImpl;


public class XIncludeNsFixup extends XMLFilterImpl {

    static String correctURI = "http://www.w3.org/2001/XInclude";
    static String oldURI = "http://www.w3.org/2003/XInclude";

    @Override
    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
        if (uri.equals(oldURI)) {
            super.startElement(correctURI, localName, qName, atts);
        }
        else {
            super.startElement(uri, localName, qName, atts);
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if (uri.equals(oldURI)) {
            super.endElement(correctURI, localName, qName);
        }
        else {
            super.endElement(uri, localName, qName);
        }
    }

    @Override
    public void startPrefixMapping(String prefix, String uri) throws SAXException {
        if (uri.equals(oldURI)) {
            super.startPrefixMapping(prefix, correctURI);
        }
        else {
            super.startPrefixMapping(prefix, uri);
        }
    }

}

然后，我分别创建了一个支持XInclude的SAXParser

XMLReader

链接到该过滤器，并将示例文档作为

SAXSource

从该过滤器加载到默认的

Transformer

中，以构建

DOMResult

：

    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setNamespaceAware(true);
    spf.setXIncludeAware(true);

    XMLReader inputReader = spf.newSAXParser().getXMLReader();

    XMLFilter fixNs = new XIncludeNsFixup();
    fixNs.setParent(inputReader);

    TransformerFactory tf = TransformerFactory.newInstance();

    Transformer builder = tf.newTransformer();

    DOMResult fixedInput = new DOMResult();

    builder.transform(new SAXSource(fixNs, new InputSource("file3.xml")), fixedInput);

    Document doc = (Document) fixedInput.getNode();

    Transformer serializer = tf.newTransformer();

    serializer.transform(new DOMSource(doc), new StreamResult(System.out));

我使用的示例文档

file3.xml

在适当的xinclude命名空间中有一个

xi:xinclude

元素，在旧的不受支持的命名空间中有一个元素：

<?xml version="1.0" encoding="UTF-8"?>
<contexts>
    <context name="a">
        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="reuse.xml"/>
        <foo>Original text 1.</foo>
    </context>
    <context name="b">
        <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="reuse.xml"/>
        <foo>Original text 2.</foo>
    </context>
</contexts>

以及Java程序的完整代码，以便于测试：

import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLFilter;
import org.xml.sax.XMLReader;


public class XIncludeTest1 {


    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerConfigurationException, TransformerException {

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setNamespaceAware(true);
        spf.setXIncludeAware(true);

        XMLReader inputReader = spf.newSAXParser().getXMLReader();

        XMLFilter fixNs = new XIncludeNsFixup();
        fixNs.setParent(inputReader);

        TransformerFactory tf = TransformerFactory.newInstance();

        Transformer builder = tf.newTransformer();

        DOMResult fixedInput = new DOMResult();

        builder.transform(new SAXSource(fixNs, new InputSource("file3.xml")), fixedInput);

        Document doc = (Document) fixedInput.getNode();

        Transformer serializer = tf.newTransformer();

        serializer.transform(new DOMSource(doc), new StreamResult(System.out));
    }

}

我还尝试将来自Apache的最新Xerces Java放在类路径上，以查看它是否解决了问题，但输出保持不变

<?xml version="1.0" encoding="UTF-8"?>
<text>I am XIncluded text.</text>

import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLFilter;
import org.xml.sax.XMLReader;


public class XIncludeTest1 {


    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerConfigurationException, TransformerException {

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setNamespaceAware(true);
        spf.setXIncludeAware(true);

        XMLReader inputReader = spf.newSAXParser().getXMLReader();

        XMLFilter fixNs = new XIncludeNsFixup();
        fixNs.setParent(inputReader);

        TransformerFactory tf = TransformerFactory.newInstance();

        Transformer builder = tf.newTransformer();

        DOMResult fixedInput = new DOMResult();

        builder.transform(new SAXSource(fixNs, new InputSource("file3.xml")), fixedInput);

        Document doc = (Document) fixedInput.getNode();

        Transformer serializer = tf.newTransformer();

        serializer.transform(new DOMSource(doc), new StreamResult(System.out));
    }

}