JAXB 是否可以首先通过包含进行封送，然后通过 @XmlIDREF 进行封送以供后续引用

JAXB（Java Architecture for XML Binding）是一个Java API，用于将Java对象与XML文档进行相互转换。它提供了一种简单的方式来将Java对象的数据封送（Marshal）到XML文档中，并将XML文档的数据解封（Unmarshal）为Java对象。在JAXB中，可以使用@XmlIDREF注解来实现对先前封送的对象的引用。

java
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Person {
    @XmlElement
    private String name;
    @XmlElement
    private int age;
    // 构造函数，getter和setter方法省略
}

java
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import java.io.File;
public class MarshallingExample {
    public static void main(String[] args) throws Exception {
        Person person = new Person();
        person.setName("John");
        person.setAge(30);
        JAXBContext jaxbContext = JAXBContext.newInstance(Person.class);
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(person, new File("person.xml"));
    }
}

java
import javax.xml.bind.annotation.XmlID;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Address {
    @XmlID
    @XmlElement
    private String city;
    @XmlElement
    private String postalCode;
    // 构造函数，getter和setter方法省略
}

java
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlIDREF;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Person {
    @XmlElement
    private String name;
    @XmlElement
    private int age;
    @XmlIDREF
    @XmlElement
    private Address address;
    // 构造函数，getter和setter方法省略
}

java
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import java.io.File;
public class MarshallingExample {
    public static void main(String[] args) throws Exception {
        Address address = new Address();
        address.setCity("New York");
        address.setPostalCode("10001");
        Person person = new Person();
        person.setName("John");
        person.setAge(30);
        person.setAddress(address);
        JAXBContext jaxbContext = JAXBContext.newInstance(Person.class, Address.class);
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(person, new File("person.xml"));
    }
}

xml
    John
    30