在合并多个xml文件时，除了父xml之外，如何为子xml文件设置EntityResolver？

Question

我有一个图书xml文件，它引用了其他多个xml文件。当我试图在book.xml文件上运行xslt时，代码中的EntityResolver解析dtd路径。但是，对于正在合并的子xml文件，dtd路径未被解析。

样本sample_book.ditamap

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE bookmap PUBLIC "-//OASIS//DTD DITA BookMap//EN" "bookmap.dtd">
<bookmap>
    <booktitle>
        <mainbooktitle>sample book</mainbooktitle>
    </booktitle>
    <part navtitle="Overview">
        <topicref href="../topics/introduction.dita"/>
        <topicref href="../topics/install.dita"/>
    </part>
</bookmap>

`

Java代码

public class XMLProcessor  {

       public void transform(String xmlf, String xslf) throws TransformerConfigurationException, TransformerException, org.xml.sax.SAXException, IOException{

        org.xml.sax.XMLReader reader = XMLReaderFactory.createXMLReader();
        Transformer transformer;
        TransformerFactory factory = TransformerFactory.newInstance();

         StreamSource stylesheet = new StreamSource(xslf);

         //Source source = StreamSource(xmlf);
         //SAXSource source = new SAXSource(new InputSource(xmlf));
        // org.xml.sax.XMLReader reader = XMLReaderFactory.createXMLReader();

         EntityResolver ent = new EntityResolver() {

            @Override
            public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {

                System.out.println(publicId);
                System.out.println(systemId);

                if(publicId.equals("-//OASIS//DTD DITA BookMap//EN")){
                    return new InputSource("file:///D:/sample/dtd/bookmap.dtd");
                }

                return null;
                }
            };
        // sour.setPublicId("file:///D:/sample/dtd/bookmap/dtd/bookmap.dtd");


            reader.setEntityResolver(ent);
            SAXSource source = new SAXSource(reader, new InputSource(xmlf));
            //reader.parse(new InputSource(xmlf));
         //StreamSource sourcedoc = new StreamSource(xmlf);
         transformer = factory.newTransformer(stylesheet);

        try {
            transformer.transform(source, new StreamResult(new FileWriter("D:\\sample\\out\\result.xml")));
        } catch (IOException ex) {
            Logger.getLogger(XMLProcessor.class.getName()).log(Level.SEVERE, null, ex);
        }

    }





}`

预期结果

`

<?xml version="1.0" encoding="UTF-8"?>
<pages xmlns:mf="urn:mf">
    <parentpage>
        <parentpagename>sample book</parentpagename>
    </parentpage>
    <part>
        <partname>Overview</partname>
        <text/>
        <level-2>
            <concept xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/"
                id="introduction" ditaarch:DITAArchVersion="1.3"
                domains="(topic concept)                            (topic abbrev-d)                            a(props deliveryTarget)                            (topic equation-d)                            (topic hazard-d)                            (topic hi-d)                            (topic indexing-d)                            (topic markup-d)                            (topic mathml-d)                            (topic pr-d)                            (topic relmgmt-d)                            (topic sw-d)                            (topic svg-d)                            (topic ui-d)                            (topic ut-d)                            (topic markup-d xml-d)   "
                class="- topic/topic concept/concept ">
                <title class="- topic/title ">Introduction</title>
                <shortdesc class="- topic/shortdesc "/>
                <conbody class="- topic/body  concept/conbody ">
                    <p class="- topic/p ">Sample introduction</p>
                </conbody>
            </concept>
        </level-2>
        <text/>
        <level-2>
            <task xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/" id="install"
                ditaarch:DITAArchVersion="1.3"
                domains="(topic task)                            (topic abbrev-d)                            a(props deliveryTarget)                            (topic equation-d)                            (topic hazard-d)                            (topic hi-d)                            (topic indexing-d)                            (topic markup-d)                            (topic mathml-d)                            (topic pr-d)                            (topic relmgmt-d)                            (topic sw-d)                            (topic svg-d)                            (topic ui-d)                            (topic ut-d)                            (topic markup-d xml-d)                            (topic task strictTaskbody-c)   "
                class="- topic/topic task/task ">
                <title class="- topic/title ">Install</title>
                <shortdesc class="- topic/shortdesc "/>
                <taskbody class="- topic/body task/taskbody ">
                    <context class="- topic/section task/context ">
                        <p class="- topic/p ">Download xyz installer from here. </p>
                    </context>
                    <steps class="- topic/ol task/steps ">
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Double-click the downloader
                                installer.</cmd>
                        </step>
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Do this.</cmd>
                        </step>
                        <step class="- topic/li task/step ">
                            <cmd class="- topic/ph task/cmd ">Do that</cmd>
                        </step>
                    </steps>
                </taskbody>
            </task>
        </level-2>
    </part>
</pages>

`

实际效果

运行XSLT时，将显示以下错误消息。当我将dtd文件移到主题文件夹时，错误就消失了。

警告(file:///D:/sample/xsl/merge.xsl)：对>XTDE0540的第54行中的/bookmap/booktitle 1的模糊规则匹配既匹配>XTDE0540第54行的"element(Q{}booktitle)“，而在第11行的第18行匹配”元素(q{}booktitle)“。 >merge.xsl: FODC0002: FODC0002: I/O错误，由XML解析器处理FODC0002 D:\sample\sampledoc\topics\concept.dtd (系统找不到 在xsl:apply中的char 11发出警告- >merge.xsl: FODC0002: FODC0002: I/O错误报告的第30行第104行的模板/@select(系统找不到指定的>文件)

Answer 1

您可以在转换器上设置一个URIResolver，当您的XSLT代码调用doc()或document()来获取引用的XML文件时，它将被调用。然后，URIResolver可以在用于解析这些文件的EntityResolver解析器上设置一个EntityResolver。

或者，您可以使用Apache来完成所有这一切，通过引用OASIS定义的格式的目录文件来推断XMLResolver和XML级别的URI。

Answer 2

多亏了迈克尔，我才能解决这个问题。

1. 在类路径中添加了一个CatalogManager.properties文件。
2. 创建一个具有所有公共ids的catalog.xml。 公共类XMLProcessor {公共空转换( String，String，String)抛出TransformerConfigurationException、TransformerException、org.xml.sax.SAXException、IOException{ org.xml.sax.XMLReader reader = XMLReaderFactory.createXMLReader()；变压器=空；TransformerFactory工厂= TransformerFactory.newInstance()；StreamSource样式表=新StreamSource( xslf )；CatalogResolver cr =新CatalogResolver()；reader.setEntityResolver(cr)；factory.setURIResolver(cr)；Logger.getLogger(XMLProcessor.class.getName()).log(Level.SEVERE，源=新SAXSource (读取器，新InputSource(xmlf))；转换器=factory.newTransformer(样式表)；尝试{transformer.transform(来源，新StreamResult(新路径))；} catch (IOException ex) {SAXSource null，ex)；}} }