Java 如何使用二进制数据内容将XML转换为Json

我尝试将xml转换为json。它适用于正常的文本数据内容。当xml标记中的数据是二进制数据时，我们无法将xml解组为java对象。您能帮助分享一下我们如何将xml转换成二进制的json吗

Java代码：

public <T> String xmlToJson(Class<T> clazz, String xmlString, boolean includeRoot) throws CustomException {
    StringWriter writer = new StringWriter();
    String jsonString = "{}";

    try {

        XMLInputFactory xif = XMLInputFactory.newInstance();
        xif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        xif.setProperty(XMLInputFactory.SUPPORT_DTD, true);
        XMLStreamReader xsr = xif.createXMLStreamReader(new StringReader(xmlString));
        JAXBContext jc = JAXBContext.newInstance(clazz);
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty("eclipselink.media-type", "application/json");
        marshaller.setProperty("eclipselink.json.include-root", includeRoot);
        marshaller.setProperty(MarshallerProperties.JSON_ATTRIBUTE_PREFIX, "@");
        JAXBElement<T> addressFromXML = unmarshaller.unmarshal(xsr, clazz); //ERROR at this line for binary data
        marshaller.marshal(addressFromXML, writer);
        jsonString = writer.toString();
    } catch (Exception e) {
        logger.error(e.getMessage());
        throw new CustomException(e.getMessage());
    }
    return jsonString;
}

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart] with root cause
java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.initializeDataTypes(XMLBinaryDataHelper.java:74)
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.<init>(XMLBinaryDataHelper.java:54)
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.getXMLBinaryDataHelper(XMLBinaryDataHelper.java:60)
    at org.eclipse.persistence.internal.oxm.XMLInlineBinaryHandler.endElement(XMLInlineBinaryHandler.java:126)
    at org.eclipse.persistence.internal.oxm.record.deferred.EndElementEvent.processEvent(EndElementEvent.java:37)
    at org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.executeEvents(DeferredContentHandler.java:64)
    at org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.executeEvents(BinaryMappingContentHandler.java:75)
    at org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.processSimpleElement(BinaryMappingContentHandler.java:67)
    at org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.endElement(DeferredContentHandler.java:122)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parseEvent(XMLStreamReaderReader.java:150)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:100)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:87)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:1016)
    at org.eclipse.persistence.internal.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:657)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:460)

公共字符串xmlToJson（类clazz、字符串xmlString、布尔includeRoot）引发CustomException{
StringWriter编写器=新的StringWriter（）；
字符串jsonString=“{}”；
试一试{
XMLInputFactory xif=XMLInputFactory.newInstance（）；
xif.setProperty（XMLInputFactory.IS_支持外部实体，false）；
xif.setProperty（XMLInputFactory.SUPPORT\u DTD，true）；
XMLStreamReader xsr=xif.createXMLStreamReader（新的StringReader（xmlString））；
JAXBContext jc=JAXBContext.newInstance（clazz）；
Unmarshaller Unmarshaller=jc.createUnmarshaller（）；
Marshaller=jc.createMarshaller（）；
setProperty（marshaller.JAXB_格式化的_输出，true）；
setProperty（“eclipselink.media type”，“application/json”）；
setProperty（“eclipselink.json.include root”，includeRoot）；
setProperty（MarshallerProperties.JSON_属性_前缀“@”）；
JAXBElement addressFromXML=unmarshaller.unmarshal（xsr，clazz）；//二进制数据此行出错
marshaller.marshall（addressFromXML，writer）；
jsonString=writer.toString（）；
}捕获（例外e）{
logger.error（例如getMessage（））；
抛出新的CustomException（例如getMessage（））；
}
返回jsonString；
}

以下是错误信息：

public <T> String xmlToJson(Class<T> clazz, String xmlString, boolean includeRoot) throws CustomException {
    StringWriter writer = new StringWriter();
    String jsonString = "{}";

    try {

        XMLInputFactory xif = XMLInputFactory.newInstance();
        xif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        xif.setProperty(XMLInputFactory.SUPPORT_DTD, true);
        XMLStreamReader xsr = xif.createXMLStreamReader(new StringReader(xmlString));
        JAXBContext jc = JAXBContext.newInstance(clazz);
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty("eclipselink.media-type", "application/json");
        marshaller.setProperty("eclipselink.json.include-root", includeRoot);
        marshaller.setProperty(MarshallerProperties.JSON_ATTRIBUTE_PREFIX, "@");
        JAXBElement<T> addressFromXML = unmarshaller.unmarshal(xsr, clazz); //ERROR at this line for binary data
        marshaller.marshal(addressFromXML, writer);
        jsonString = writer.toString();
    } catch (Exception e) {
        logger.error(e.getMessage());
        throw new CustomException(e.getMessage());
    }
    return jsonString;
}

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart] with root cause
java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.initializeDataTypes(XMLBinaryDataHelper.java:74)
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.<init>(XMLBinaryDataHelper.java:54)
    at org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.getXMLBinaryDataHelper(XMLBinaryDataHelper.java:60)
    at org.eclipse.persistence.internal.oxm.XMLInlineBinaryHandler.endElement(XMLInlineBinaryHandler.java:126)
    at org.eclipse.persistence.internal.oxm.record.deferred.EndElementEvent.processEvent(EndElementEvent.java:37)
    at org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.executeEvents(DeferredContentHandler.java:64)
    at org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.executeEvents(BinaryMappingContentHandler.java:75)
    at org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.processSimpleElement(BinaryMappingContentHandler.java:67)
    at org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.endElement(DeferredContentHandler.java:122)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parseEvent(XMLStreamReaderReader.java:150)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:100)
    at org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse(XMLStreamReaderReader.java:87)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:1016)
    at org.eclipse.persistence.internal.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:657)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:460)

路径为[]的上下文中Servlet[dispatcherServlet]的

Servlet.service（）引发了异常[Handler dispatch failed；嵌套异常为java.lang.NoClassDefFoundError:javax/mail/internet/MimeMultipart]，并带有根本原因
java.lang.NoClassDefFoundError:javax/mail/internet/MimeMultipart
位于org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.initializeDataTypes（XMLBinaryDataHelper.java:74）
位于org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper。（XMLBinaryDataHelper.java:54）
位于org.eclipse.persistence.internal.oxm.XMLBinaryDataHelper.getXMLBinaryDataHelper（XMLBinaryDataHelper.java:60）
位于org.eclipse.persistence.internal.oxm.XMLInlineBinaryHandler.endElement（XMLInlineBinaryHandler.java:126）
位于org.eclipse.persistence.internal.oxm.record.deferred.EndElementEvent.processEvent（EndElementEvent.java:37）
位于org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.executeEvents（DeferredContentHandler.java:64）
位于org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.executeEvents（BinaryMappingContentHandler.java:75）
位于org.eclipse.persistence.internal.oxm.record.deferred.BinaryMappingContentHandler.processSimpleElement（BinaryMappingContentHandler.java:67）
位于org.eclipse.persistence.internal.oxm.record.deferred.DeferredContentHandler.endElement（DeferredContentHandler.java:122）
位于org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parseEvent（XMLStreamReaderReader.java:150）
位于org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse（XMLStreamReaderReader.java:100）
位于org.eclipse.persistence.internal.oxm.record.XMLStreamReaderReader.parse（XMLStreamReaderReader.java:87）
位于org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal（SAXUnmarshaller.java:1016）
位于org.eclipse.persistence.internal.oxm.xmlumarshaller.unmarshal（xmlumarshaller.java:657）
位于org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal（JAXBUnmarshaller.java:460）

类路径上缺少java邮件api

如果您使用的是maven，您应该能够通过添加布局依赖项来修复此问题：

    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>javax.mail-api</artifactId>
    </dependency>
    <dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
    </dependency>

javax.mail
但二进制数据内容失败
——错误在哪里？如果您不在try/catch块中吞咽异常，这将很有帮助……您好@rkosegi，我刚刚更新了我的问题，其中包括堆栈跟踪。这是我第一次尝试将包含二进制内容的xml解析为object，并从object解析为json。二进制内容下划线java库有一个静态方法U.xmlToJson（xmlstring）。谢谢rkosegi。它运行良好。我仍然不明白为什么javax.mail会涉及到从xml到对象的解组。您能帮我解释一下吗？在我添加库javax.mail javax.mail-api 1.6.2@John之后，非常感谢大家对java-mail-api的需求。现在我明白了。对于文本数据，它不调用第三方LIB。对于二进制数据，它调用第三方libs（javax.mailapi）来处理解析器。谢谢你的解释。