JAXB 注释

JAXB（Java Architecture for XML Binding）是一种用于将Java对象与XML文档进行相互转换的技术。它提供了一种简单的方式来处理XML数据，并且可以自动将Java对象的属性与XML元素进行映射。在本文中，我们将介绍JAXB注释的使用方法，并通过案例代码来演示其实际应用。

java
@XmlRootElement(name = "person")
public class Person {
    // ...
}

java
@XmlRootElement(name = "person")
public class Person {
    @XmlElement(name = "name")
    private String name;
    // ...
}

java
@XmlRootElement(name = "person")
public class Person {
    @XmlAttribute(name = "id")
    private int id;
    // ...
}

java
@XmlRootElement(name = "person")
public class Person {
    @XmlElement(name = "name")
    private String name;
    
    @XmlElement(name = "age")
    private int age;
    
    // 省略构造方法和其他方法
    
    // Getters and setters
}

java
public class Main {
    public static void main(String[] args) throws JAXBException {
        Person person = new Person("John Doe", 30);
        
        // 将Java对象转换为XML文档
        JAXBContext context = JAXBContext.newInstance(Person.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(person, System.out);
        
        // 将XML文档转换为Java对象
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Person unmarshalledPerson = (Person) unmarshaller.unmarshal(new File("person.xml"));
        
        // 打印转换后的Java对象
        System.out.println(unmarshalledPerson.getName());
        System.out.println(unmarshalledPerson.getAge());
    }
}