JAXB 将嵌套元素解组为 Null

使用JAXB (Java Architecture for XML Binding) 是一种常用的Java技术，用于将XML数据绑定到Java对象。在使用JAXB进行XML反序列化时，有时会遇到将嵌套元素解组为Null的情况。本文将介绍如何使用JAXB解决这个问题，并提供一个案例代码。

java
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Person {
    
    private String name;
    
    @XmlElement(nillable = true)
    private Address address;
    
    // getters and setters
}
@XmlAccessorType(XmlAccessType.FIELD)
public class Address {
    
    private String street;
    
    // getters and setters
}
public class Main {
    
    public static void main(String[] args) throws JAXBException {
        String xml = "John Doe";
        
        JAXBContext context = JAXBContext.newInstance(Person.class);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Person person = (Person) unmarshaller.unmarshal(new StringReader(xml));
        
        System.out.println(person.getName()); // Output: John Doe
        System.out.println(person.getAddress()); // Output: null
    }
}