java - 如何在 List 内容 JaxB 中添加元素？

Question

我不知道如何向 List<Serializabe> 添加元素内容，这是我使用 JaxB 从自动生成的 Java 类中获得的。

例如，我需要在该列表中添加简单的字符串，但是当我传递一个字符串时

sadrzaj.getContent().add("some string");

上面写着

java.lang.ClassCastException: jaxb.from.xsd.Clan$Sadrzaj$Stav cannot be cast to java.lang.String

这是我的代码:

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

@XmlElementRefs({
@XmlElementRef(name = "Tekst", namespace = "http://www.parlament.gov.rs/clan", type = JAXBElement.class),
@XmlElementRef(name = "Stav", namespace = "http://www.parlament.gov.rs/clan", type = JAXBElement.class)
    })
    @XmlMixed
    protected List<Serializable> content;

    public List<Serializable> getContent() {
        if (content == null) {
            content = new ArrayList<Serializable>();
        }
        return this.content;
    }

我的静态类 Sadrzaj 的 XML 架构如下所示:

<complexType>
 *   <complexContent>
 *     <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       <choice>
 *         <element name="Stav" maxOccurs="unbounded">
 *           <complexType>
 *             <complexContent>
 *               <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *                 <sequence>
 *                   <element name="Redni_broj" type="{http://www.w3.org/2001/XMLSchema}long"/>
 *                   <element name="Tekst" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *                 </sequence>
 *               </restriction>
 *             </complexContent>
 *           </complexType>
 *         </element>
 *         <element name="Tekst" type="{http://www.w3.org/2001/XMLSchema}string" maxOccurs="unbounded"/>
 *       </choice>
 *     </restriction>
 *   </complexContent>
 * </complexType>

Answer 1

请查看此相关帖子:JAXB - List?和相关的 Java8 文档:Annotation Type XmlMixed

要创建可序列化的 JAXBElement，您应该使用生成的 ObjectFactory:

 LetterBody lb = ObjectFactory.createLetterBody();
 JAXBElement<LetterBody> lbe = ObjectFactory.createLetterBody(lb);
 List gcl = lb.getContent();  //add mixed content to general content property.
 gcl.add("Dear Mr.");  // add text information item as a String.

 // add child element information item
 gcl.add(ObjectFactory.createLetterBodyName("Robert Smith"));
 gcl.add("Your order of "); // add text information item as a String

 // add children element information items
 gcl.add(ObjectFactory.
                      createLetterBodyQuantity(new BigInteger("1")));
 gcl.add(ObjectFactory.createLetterBodyProductName("Baby Monitor"));
 gcl.add("shipped from our warehouse");  // add text information item