JAXB-Unmarshalling期间的ObjectFactory角色是什么？

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问题描述

我正在使用JAXB 2.2.2来解析一个简单的XML-REST流。这是一段代码：

I'm using JAXB 2.2.2 to parse a simple XML-REST stream. This is the piece of code:

JAXBContext jc = JAXBContext.newInstance( "com.example.entities" );
Unmarshaller u = jc.createUnmarshaller();
r = (Response )u.unmarshal( inputStream );

ObjectFactory类：

ObjectFactory class:

@XmlRegistry
public class ObjectFactory {

    public Response createRsp() {
        return new Response();
    }
}

回复类：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name="rsp")
@XmlType
public class Response { ... }

com.example.entities必须包含ObjectFactory类或jaxb.index 。我想使用ObjectFactory类来决定一些pojo初始化，但是从不使用这些类：Response类总是直接由class.newInstance（）实例化。
这有什么不对吗？

The "com.example.entities" must contain the ObjectFactory class or jaxb.index. I would like to use the ObjectFactory class in order to decide some pojo initialization, but these class is never used: the Response class is always instantiated by class.newInstance() directly.Is there something wrong in this?

推荐答案

你可以利用注释控制如何创建对象：

You can leverage the @XmlType annotation to control how the objects are created:

@XmlType(factoryClass=ObjectFactory.class, factoryMethod="createRsp")
public class Response {
}

更多信息

http://bdoughan.blogspot.com/2011/06/jaxb-and-factory-methods.html

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