@XmlRootElement位于类上，但不在xml中

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.StringWriter;

public class JAXBExample {
    public static void main(String[] args) {
        try {
            // 创建 JAXB 上下文
            JAXBContext context = JAXBContext.newInstance(YourClass.class);
            
            // 创建 Marshaller 实例
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            
            // 序列化对象到 XML
            YourClass obj = new YourClass();
            StringWriter sw = new StringWriter();
            marshaller.marshal(obj, sw);
            
            System.out.println(sw.toString());
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
}

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
    <version>2.3.1</version>
</dependency>

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "YourRootElement")
public class YourClass {
    // 类的属性和方法
}