Java Xml Reader 将 BMP 外部的字符解析为代理项对，这会导致无效的 xml

我正在try 解析一个包含十六进制值𝓅的XML.这表示数学符号?.我得到的输出是��.

我做错了什么？

示例输入XML:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <data>&#x1d4c5;</data>
</root>

输出:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <data>&#55349;&#56517;</data>
</root>

获取XML读取器的代码:

factory = org.apache.xerces.jaxp.SAXParserFactoryImpl.newInstance();
final XMLReader xmlReader;
        xmlReader = factory.newSAXParser().getXMLReader();

我正在使用UTF-8编码在解析时进行解码.

我用来读写XML的代码是这个方法:

public void readAndWriteXml(InputSource inputSource, OutputStream out) throws IOException, SAXException, ParserConfigurationException {

            XMLReader xmlReader = getXmlReader();
            Serializer serializer = SerializerFactory.getSerializer(configProps);
            serializer.setOutputStream(out);
            xmlReader.setContentHandler(serializer.asContentHandler());

            if(logger != null){
                getLogger().debug("starting xml parsing" + LocalTime.now());
            }
            xmlReader.parse(inputSource);
            if(logger != null){
                getLogger().debug("end xml parsing" + LocalTime.now());
            }

        }

GetXMLReader()如下所示:

final XMLReader xmlReader;
        xmlReader = factory.newSAXParser().getXMLReader();
        xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
        xmlReader.setFeature("http://xml.org/sax/features" +
                "/namespaces", true);
        xmlReader.setFeature("http://xml.org/sax/features/external-parameter-entities", true);
//        xmlReader.setFeature("http://xml.org/sax/features/validation", true);
        xmlReader.setEntityResolver(wrappedEntityResolver);
        xmlReader.setErrorHandler(new SaxErrorHandler());
        return xmlReader;

以下是我对类进行初始化的过程:

public XmlNormalizer(String catalogPath) throws IOException {
        // We want the Apache XML parser, not the embedded Oracle Java version.
        factory = org.apache.xerces.jaxp.SAXParserFactoryImpl.newInstance();
        factory.setNamespaceAware(true);
        List<Path> catalogFiles = this.findByFileName(new File(catalogPath).toPath(), CATALOG_FILENAME_PATTERN);
        String[] catalogArray = catalogFiles.stream().map(Path::toString).toArray(String[]::new);
        configProps = OutputPropertiesFactory.getDefaultMethodProperties("xml");
        XMLCatalogResolver xmlCatalogResolver = new XMLCatalogResolver(catalogArray, true);
        wrappedEntityResolver = new WrappedEntityResolver(xmlCatalogResolver);
    }

WrapedEntityResolver只是import org.apache.xerces.util.XMLCatalogResolver;左右的包装器