如何避免在@XmlType propOrder 中添加所有字段并从父 class 导入字段

Question

我正在尝试使用 JAXB 注释编组输入，但我遇到了一些小问题。想确认是否可以实现

我有两个 classes parent 和 child 每个都有很多字段。 child class 扩展 parent class.

是否可以将 parent class 中的元素添加到 child class prepOrder 中用于 @XmlType?
是否需要在propOrder内添加所有元素？例如，如果我有 10 个字段，我只想订购其中的 4 个字段。休息可以按他们想要的任何顺序出现。是否有可能做到这一点？因为当我不添加字段时我收到错误。


@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Parent",propOrder={"city","year"})
public class Parent{
    private String brand;
    private String city;
    private String year;
    
    //Getters and Setters avoided
}

@XmlRootElement(name = "Car")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Child",propOrder={"engine","brand","build"})
public class Child{
    private String engine;
    private String build;
    
    //Getter and Setters avoided
}

public class Main{
        public static void main(String []args){
        Child child = new Child();
        //Adding values and creating xml using the Marshalling approach
        JAXBContext context = JAXBContext.newInstance(Child.class);
        Marshaller mar = context.createMarshaller();
        mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        mar.marshal(child, System.out);
     }
}

我期待的最终xml是：

<?xml version="1.0"?>
<child>
    <cit>Frankfurt</cit>
    <year>2021</year>
    <engine>Mercedes</engine>
    <brand>Ferari</brand>
    <build>Germany</build>
</child>

Answer 1

经过大量的试错方法，我终于做到了。发布答案，因为它可能对将来的其他人有用：

在 Parent class 上添加 @XmlTransient 注释并删除 propOrder.

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Parent")
@XmlTransient
public class Parent{
//All the parent element fields and other codes getter/setters
}

添加扩展 Parent

Child

@XmlRootElement(name = "Car")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Child",propOrder={"city","year","engine","brand","build"})
public class Child{
}

如何避免在@XmlType propOrder 中添加所有字段并从父 class 导入字段

How to avoid adding all fields in @XmlType propOrder and also import the fields from parent class

java

xml

jaxb

marshalling

xmltype