Question

我有一些XSD，我通过XJC从中创建了Java代码。我可以通过提供的“直接映射”POJO XJC获得许多信息。其余大部分都可以通过JAXBElements检索。然而，有一些因素我不知道如何与他们交谈，即“交易/描述”父母下的“成本”元素。

<transaction>
  <aid-type code="1995-09-25"/>
  <flow-type code="10">ODA</flow-type>
  <provider-org ref="DE-1">BMZ</provider-org>
  <value currency="EUR" value-date="1995-09-25">2070227</value>
  <transaction-type code="D">Disbursement</transaction-type>
  <description type="1" xml:lang="en">
    <costs currency="EUR" type="Personnel costs">1060135</costs>
    <costs currency="EUR" type="Material costs">665117</costs>
    <costs currency="EUR" type="Other costs">344975</costs>
  </description>
</transaction>

正如您所见，Transaction.java包含'description'元素并将其映射到JAXBElement.class。

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"valueOrDescriptionOrTransactionType"
})
@XmlRootElement(name = "transaction")
public class Transaction {

@XmlElementRefs({
    @XmlElementRef(name = "transaction-date", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "value", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "disbursement-channel", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "receiver-org", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "transaction-type", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "description", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "tied-status", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "aid-type", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "finance-type", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "provider-org", type = JAXBElement.class, required = false),
    @XmlElementRef(name = "flow-type", type = JAXBElement.class, required = false)
})
@XmlAnyElement(lax = true)
protected List<Object> valueOrDescriptionOrTransactionType;
@XmlAttribute(name = "ref")
protected String ref;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();

在Transaction.java之上，架构片段显示：

...
&lt;element name="description" type="{}textType"/>
...

因此'description'的类型应该是JAXBElement＆lt; TextType＆gt;。 TextType.java如下所示：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "textType", propOrder = {"content"})
public class TextType {

@XmlMixed
@XmlAnyElement(lax = true)
protected List<Object> content;
@XmlAttribute(name = "lang", namespace = "http://www.w3.org/XML/1998/namespace")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();

现在要从事务中获取信息，我构建了一个事务对象并检索它的内容：

 List<Object> listOfTransactionContents = transaction.getValueOrDescriptionOrTransactionType();

这给了我一个列表，我在其中查找JAXBElement对象。

for (Object obj : listOfTransactionContents)
{
    JAXBElement<TextType> jaxbElementTextType = (JAXBElement<TextType>) obj;
    TextType textType = jaxbElementTextType.getValue();
    List<Object> listOftTextTypes = textType.getContent();
    ....

但问题是我现在不知道如何获取'cost'元素的内容。在TextType.java的getContent（）方法之上，它说：

 * Objects of the following type(s) are allowed in the list
 * {@link Element }
 * {@link String }
 * {@link Object }

'cost'元素的内容必须存储在某种列表中，因为'description'父级下可以有多个。

Answer 1

@XmlAnyElement(lax=true)表示如果遇到的元素对应于类的根元素（使用@XmlRootElement或@XmlElementDecl映射，则将创建该对象的实例，否则数据将是保留为DOM节点。

@XmlMixed
@XmlAnyElement(lax = true)
protected List<Object> content;

了解更多信息

http://blog.bdoughan.com/2012/12/jaxbs-xmlanyelementlaxtrue-explained.html

Answer 2

我的上帝是什么样的旅行...'cost'元素被映射到com.sun.org.apache.xerces.internal.dom.ElementNSImpl。我不知道为什么......但我现在可以了解所需的信息。

JAXB - 无法获取某些对象信息

2 个答案: