具有屬性列表<Element>（@XmlAnyElement）的JAXB編組對象不輸出節點值

Question

以下文件TPAExtensionsType.java我從XSD文件生成了。

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; 
    } 

} 

以下是獨立的應用程序，以馬歇爾上述目的爲XML。

TestUtil.java

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(); 
     } 

    } 
} 

以下是輸出：

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

問題，我面對：

ConsumerInfo已創建的節點，但它的價值是不可見的生成的XML，儘管我已經在上面的獨立應用程序中設置了它的值。任何人都可以幫助我解決這個問題，什麼是造成這個問題？

Answer 1

引述DOM spec on nodeValue（重點礦山）：

此節點的值，取決於其類型; 見上表。 當它被定義爲null時，將其設置爲無效。

如果滾動了一下，你會看到一個表，其中就提到，Element型節點通過null的nodeValue定義。我想這就是爲什麼它不會顯示在您的XML中，因爲設置它沒有影響。

也許你可以用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); 

輸出

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

在輸出