Question

我想使用XML解组下面的JAXB，以便可以导航到子节点以读取叶子标签元素。

<root>
   <concept name="GrandParent">
    <concept name="Parent1">
        <concept name="Child11">
            <input>some child input11</input>
        </concept>
        <concept name="Child12">
            <input>some child input21</input>
        </concept>
    </concept>      
    <concept name="Parent2">
            <concept name="Child21">
                <input>some child input21</input>
            </concept>
            <concept name="Child22">
                 <input>some child input22</input>
            </concept>
    </concept>
   </concept>   
</root>

我希望有1个父母和2个父母的孩子数量。

Answer 1

您需要构建模型，使用JAXB批注进行注释并解析给定的XML。参见以下示例：

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import java.io.File;
import java.util.List;

public class XmlMapperApp {

    public static void main(String[] args) throws Exception {
        File xmlFile = new File("./resource/test.xml").getAbsoluteFile();

        JAXBContext jaxbContext = JAXBContext.newInstance(Roots.class);

        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        Concept root = ((Roots) unmarshaller.unmarshal(xmlFile)).getConcept();
        root.getConcept().forEach(c -> System.out.println(c.getName() + " => " + c.getConcept().size()));
    }
}

@XmlRootElement(name = "root")
@XmlAccessorType(XmlAccessType.FIELD)
class Roots {

    private Concept concept;

    // getters, setters
}

@XmlType(name = "concept")
@XmlAccessorType(XmlAccessType.FIELD)
class Concept {

    @XmlAttribute
    private String name;

    @XmlElement
    private List<Concept> concept;

    // getters, setters
}

上面的代码显示：

Parent1 : 2
Parent2 : 2

解组具有与父代和子代相同标签的JAXB元素

1 个答案: