使用@XmlSeeAlso注解，xml转换bean时，转换的对象类型总是为同一个

@XmlSeeAlso({AccountInfoQueryRequest.class, AccountInfoRequest.class})
public abstract class Request {

}


@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "request")
@XmlType(name = "AccountInfoRequest")
public class AccountInfoRequest extends Request {
    private A a;
    
}


@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "response")
@XmlType(name = "AccountInfoResponse")
public class AccountInfoResponse extends Response {
    private B b;

}


@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "body")
public class Body {

    @XmlElementRef
    private Request request;


}

如上，xml转换成Body对象时，不管xml的request标签内容是什么，总是转换成AccountInfoRequest对象，

解决方法：使用@XmlElementRefs，@XmlElementRef注解映射对应的对象类型，对象转换符合预期

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "body")
public class Body {

    @XmlElementRefs({
            @XmlElementRef(name = "AccountInfoRequest", type = AccountInfoRequest.class),
            @XmlElementRef(name = "AccountInfoQueryRequest", type = AccountInfoQueryRequest.class)
    })
    private Request request;

}

参考

https://bbs.csdn.net/topics/392427716