java - 具有 List (@XmlAnyElement) 类型属性的 JAXB 编码对象不输出节点值

Question

下面是我从 XSD 文件生成的文件 TPAExtensionsType.java。

TPAExtensionsType.java

/* 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="TPA_Extensions_Type">
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;any processContents='skip' maxOccurs="unbounded" minOccurs="0"/>
 *       &lt;/sequence>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */ 
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "TPA_Extensions_Type", propOrder = {
    "any"
})
@XmlRootElement 
public class TPAExtensionsType {

    @XmlAnyElement
    protected List<Element> any;

    /**
     * Gets the value of the any property.
     * 
     * <p>
     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a <CODE>set</CODE> method for the any property.
     * 
     * <p>
     * For example, to add a new item, do as follows:
     * <pre>
     *    getAny().add(newItem);
     * </pre>
     * 
     * 
     * <p>
     * Objects of the following type(s) are allowed in the list
     * {@link Element }
     * 
     * 
     */
    public List<Element> getAny() {
    if (any == null) {
        any = new ArrayList<Element>();
    }
    return this.any;
    }

}

以下是将上述对象编码为 XML 的独立应用程序。

测试工具

public class TestUtil {
    public static void main(String[] args) {
        TPAExtensionsType tpaExtensions = new TPAExtensionsType();
        Element consumerInfo = new DOMElement("ConsumerInfo");
        consumerInfo.setNodeValue("Some Info");
        tpaExtensions.getAny().add(consumerInfo);

        StringWriter sw  = new StringWriter();
        JAXBContext context;
        try {
            context = JAXBContext.newInstance(TPAExtensionsType.class);
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            marshaller.marshal(tpaExtensions, sw);
            System.out.println(sw.toString());
        } catch (JAXBException e) {
            e.printStackTrace();
        }

    }
}

以下是输出:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<tpaExtensionsType xmlns="SOME_NAMESPACE_ HERE">
    <ConsumerInfo xmlns="" xmlns:ns2="SOME_NAMESPACE_ HERE"/>
</tpaExtensionsType>

我面临的问题:

节点 ConsumerInfo 已创建，但它的值在生成的 XML 中不可见，尽管我在上面的独立应用程序中设置了它的值。有人可以帮我解决这个问题吗？是什么导致了这个问题？

Answer 1

引用 DOM spec on nodeValue (强调我的):

The value of this node, depending on its type; see the table above. When it is defined to be null, setting it has no effect.

如果向上滚动一点，您会看到一个表格，其中提到了 Element类型节点定义为 null节点值。我想这就是它没有出现在您的 XML 中的原因，因为 设置它无效 .

也许你可以使用 Node.setTextContent(String textContent) ?

Document doc = DocumentBuilderFactory.newInstance()
                  .newDocumentBuilder().newDocument();
Element consumerInfo = doc.createElement("consumerInfo");
consumerInfo.setTextContent("some info");
doc.appendChild(consumerInfo);
TPAExtensionsType tp = new TPAExtensionsType();
tp.getAny().add((Element) doc.getFirstChild());

JAXBContext jc = JAXBContext.newInstance(TPAExtensionsType.class);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(tp, System.out); 

输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<tpaExtensionsType>
    <consumerInfo>some info</consumerInfo>
</tpaExtensionsType>