问题描述

说，我有两个班:

@XmlRootElement
class A {
    @XmlElement
    String propertyOfA;
    @XmlElement
    B b;
}

class B {
    @XmlElement
    String propertyOfB;
} 

JAXB 返回以相应方式格式化的 XML:

JAXB returns an XML formatted in the according way:

<a>
  <propertyOfA>valueA</propertyOfA>
  <b>
    <propertyOfB>valueB</propertyOfB>
  </b>
</a>

我的问题是如何展平 XML 中的层次结构? 所以我有:

My question is how to flatten the hierarchy in the XML? So that I have:

<a>
  <propertyOfA>valueA</propertyOfA>
  <propertyOfB>valueB</propertyOfB>
</a>

这可以通过注释来完成吗?

Can this be done with annotations?

目前我正在考虑为 A 创建一种包装类，它可以按照我希望在 XML 中看到它们的方式构建字段.有没有更好的办法?

At the moment I am thinking to create a kind of wrapper class for A, that would have fields built the way I want to see them in the XML. Is there a better way?

推荐答案

注意:我是EclipseLink JAXB (MOXy) 领导和 JAXB 2 (JSR-222) 专家组.

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB 2 (JSR-222) expert group.

您可以使用 MOXy 的 @XmlPath 扩展来映射此用例:

You could use MOXy's @XmlPath extension to map this use case:

import java.xml.bind.annotation.*;
import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement
class A {
    @XmlElement
    String propertyOfA;

    @XmlPath(".")
    B b;
}

更多信息

• http://blog.bdoughan.com/2010/07/xpath-based-mapping.html
• http://blog.bdoughan.com/2010/09/xpath-based-mapping-geocode-example.html
• http://blog.bdoughan.com/2011/03/map-to-element-based-on-attribute-value.html
• http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html