java - 我如何处理使用 Jaxb 解析的 xml 文件而不是从根元素解析

Question

有人可以给我以下情况的建议吗: 我的 xml 文件中有这样的结构:

    <?xml ... ?>
    <root>
     <listof_aaa>
      <aaa>aaa_object</aaa>
      <aaa>aaa_object</aaa>
      ...
     </listof_aaa>
     <listof_bbb>
      <bbb>bbb_object</bbb>
      <bbb>bbb_object</bbb>
      ...
     </listof_bbb>
     <listof_ccc>
      <ccc>ccc_object</ccc>
      <ccc>ccc_object</ccc>
      ...
     </listof_ccc>
   </root>

我的目标是首先读取所有 aaa-objects，然后是 bbb 等等...... 如果在根标记中我有几个不同的对象系列，我该如何解析这样的结构？我考虑过使用 JAXB，但无法理解，在这种情况下我能如何使用它。

附注所有对象族都是 POJO。 谢谢!

Answer 1

您的情况下典型的自动生成的类如下所示:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "listof_aaa",
    "listof_bbb",
    "listof_ccc",
    "listinside"
})
@XmlRootElement(name = "root")
public class Root {

    @XmlElement(required = true)
    protected Listof_aaa listof_aaa;
    protected Listof_bbb listof_bbb;
    protected Listof_ccc listof_ccc;
    protected java.util.List<Listinside> listinside // example of multiple elements with one node name under the root

    public Listof_aaa getListof_aaa() {
      return listof_aaa;
    }

    public void setListof_aaa(Listof_aaa value) {
      this.listof_aaa = value;
    }

    // other getters and setters
    // and an example of multiple elements under the root

    public java.util.List<Listinside> getListinside() {
    if (listinside == null) {
        listinside = new ArrayList<Listinside>();
    }
    return this.sec;
}
}

迭代:

public static void main(String[] args) throws JAXBException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
        JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
        Unmarshaller unmarhsaller = jaxbContext.createUnmarshaller();
        Root root = (Root) unmarhsaller.unmarshal(new File("pathToYourFile.xml"));
       Listof_aaa listof_aa = root.getListof_aaa();

       /* and in case of a list */
       List<Listinside> listinside = root.getListinside();
       for (List myList : listinside) {
           // do your stuff
       }
}