没有 @XMLRootElement 的 JAXB 编组和解组子元素

Question

我正在尝试编组一个子元素对象以获取 xml 字符串。然后使用这个 xml 字符串我也想解组。

为了澄清，我已经从 xsd 生成了我的 jaxb 类，并且我在 ObjectFactory 中没有任何方法可以提供所需的对象。

xsd 定义：IBUSStatusType 是根元素 IBUSMessage 的子元素

我想编组一个 IBUSStatusType 的对象。为此，我的编组代码如下：

  public static StringWriter getStringFromIBUSStatusType(IBUSStatusType iBUSStatusType) throws JAXBException

  {

    StringWriter stringWriter = new StringWriter();

    JAXBContext jaxbContext = JAXBContext

        .newInstance(com.myhealth.soa.ibus.v1_1.ObjectFactory.class);

    Marshaller marshaller = jaxbContext.createMarshaller();

    marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);

    marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper",

        new DefaultNamespacePrefixMapper());

    marshaller.setProperty("com.sun.xml.bind.xmlDeclaration", Boolean.FALSE);

    QName qName = new QName("com.myhealth.soa.ibus.v1_1", "iBUSStatusType");

    JAXBElement<IBUSStatusType> root = new JAXBElement<>(qName, IBUSStatusType.class, iBUSStatusType);

    marshaller.marshal(root, stringWriter);

    return stringWriter;

  }

当我编组 IBUSStatusType 对象时，我得到了这个 xml 字符串：

<ns2:iBUSStatusType xmlns:tns="http://soa.myhealth.com/ibus/v1.1.0" xmlns:ns2="com.myhealth.soa.ibus.v1_1"><tns:code>8</tns:code><tns:description>Completed With Warning</tns:description><tns:Messages><tns:Message><tns:Reason><tns:description>Subscriber's email missing</tns:description><tns:code>2187</tns:code></tns:Reason><tns:type>1</tns:type><tns:Context><tns:description>WARN</tns:description>

Answer 1

好吧，最后我们找到了解决方案。我在下面粘贴我的解决方案。我确实根据@Iurii 更改了代码，但问题出在其他地方。所以，这是编组部分的变化。QName 的第二个参数必须是类名而不是它的对象。我试图按照这个链接https://codenotfound.com/jaxb-marshal-element-missing-xmlrootelement-annotation.html但没有用。当将 QName 的第二个参数更改为类名时，它就起作用了。并且上下文应该由该类构成，因为 ObjectFactory 没有它。&nbsp; &nbsp; JAXBContext jaxbContext = JAXBContext.newInstance(IBUSStatusType.class);&nbsp; &nbsp;&nbsp;QName qName = new QName("http://soa.independenthealth.com/ibus/v1.1.0", "IBUSStatusType");&nbsp; &nbsp;&nbsp;JAXBElement<IBUSStatusType> root = new JAXBElement<IBUSStatusType>(qName, IBUSStatusType.class, iBUSStatusType);&nbsp; &nbsp;&nbsp;这是整个 Unmarshal 代码。我们必须在解组之前将 xml 更改为节点。Element的导入是import org.w3c.dom.Element；&nbsp; public static IBUSStatusType getIBUSStatusType(String xml)&nbsp; &nbsp; &nbsp; throws JAXBException, SAXException, IOException, ParserConfigurationException&nbsp; {&nbsp; &nbsp; JAXBContext jaxbContext = JAXBContext&nbsp; &nbsp; &nbsp; &nbsp; .newInstance(IBUSStatusType.class);&nbsp; &nbsp; Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; Element node =&nbsp; DocumentBuilderFactory&nbsp; &nbsp; &nbsp; &nbsp; .newInstance()&nbsp; &nbsp; &nbsp; &nbsp; .newDocumentBuilder()&nbsp; &nbsp; &nbsp; &nbsp; .parse(new ByteArrayInputStream(xml.getBytes()))&nbsp; &nbsp; &nbsp; &nbsp; .getDocumentElement();&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; return ((JAXBElement<IBUSStatusType>) jaxbUnmarshaller.unmarshal(node, IBUSStatusType.class)).getValue();&nbsp; }

Answer 2

看看你的架构<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://soa.myhealth.com/ibus/v1.1.0" targetNamespace="http://soa.myhealth.com/ibus/v1.1.0" elementFormDefault="qualified">&nbsp; &nbsp; <xsd:element name="IBUSMessage" type="tns:IBUSMessage"/>&nbsp; &nbsp; <xsd:complexType name="IBUSMessage">&nbsp; &nbsp; &nbsp; &nbsp; <xsd:sequence>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <xsd:element name="Header" type="tns:IBUSHeaderType"/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <xsd:element name="Detail" type="tns:IBUSVariantType"/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <xsd:element name="Status" type="tns:IBUSStatusType"/>&nbsp; &nbsp; &nbsp; &nbsp; </xsd:sequence>&nbsp; &nbsp; </xsd:complexType>有一个命名空间http://soa.myhealth.com/ibus/v1.1.0 ，当您进行解组时，它期望http://soa.myhealth.com/ibus/v1.1.0 但以前当您进行编组时，您放置以下命名空间QName qName = new QName("com.myhealth.soa.ibus.v1_1", "iBUSStatusType");它们不一样。