Jaxb：我如何生成ObjectFactory类？ [英] Jaxb: How do I generate ObjectFactory class?

问题描述

我正在使用Java 6，JaxB 2和SpringSource Tool Suite（与Eclipse相同）。我有几个我编写的Java类，我从中使用JaxB生成XML模式。但是，我注意到为了使用JaxB从Java对象生成XML文档的能力，我需要一个ObjectFactory。

I'm using Java 6, JaxB 2 and SpringSource Tool Suite (same as Eclipse). I had a couple of Java classes I wrote, from which I used JaxB to generate an XML schema. However, I'm noticing in order to use JaxB's ability to generate an XML document from Java objects, I need an ObjectFactory.

final Marshaller marshaller = jaxbContext.createMarshaller();
// Here is where I don't have an ObjectFactory defined
final JAXBElement<WebLeads> webLeadsElement  
         = (new ObjectFactory()).createWebLeads(webLeadsJavaObj);

如何在不吹走现有课程的情况下生成ObjectFactory？

How can I generate an ObjectFactory without blowing away the classes I already have now?

推荐答案

更新

这个问题可能是指 ObjectFactory 在创建 JAXBContext 时的作用。如果您在上下文路径上引导 JAXBContext ，那么它将检查该位置中的ObjectFactory以确定该包中的类：

This question may be referring to the role of ObjectFactory in creating a JAXBContext. If you bootstrap a JAXBContext on a context path then it will check for an ObjectFactory in that location in order to determine the classes in that package:

• http://bdoughan.blogspot.com/2010/09/processing-atom-feeds-with-jaxb.html

• http://bdoughan.blogspot.com/2010/09/processing-atom-feeds-with-jaxb.html

如果您没有 ObjectFactory ，但仍希望在上下文路径上创建 JAXBContext ，则可以包含一个名为 jaxb.in​​dex 的文件，在该软件包中列出要包含在 JAXBContext 中的文件（引用的类将自动引入）：

If you do not have an ObjectFactory but still wish to create you JAXBContext on a context path you can include a file called jaxb.index in that package listing files to be included in the JAXBContext (referenced classes will automatically pulled in):

• http://bdoughan.blogspot.com/2010/08/using-xmlanyelement-to-build-generic.html

• http://bdoughan.blogspot.com/2010/08/using-xmlanyelement-to-build-generic.html

或者你可以引导你 JAXBContext 在类数组而不是上下文路径上：

Alternatively you can bootstrap you JAXBContext on an array of classes instead of a context path:

• http://bdoughan.blogspot.com/2010/11/jaxb-and-inheritance-using -xsitype.html

• http://bdoughan.blogspot.com/2010/11/jaxb-and-inheritance-using-xsitype.html

是否需要ObjectFactory

不需要 ObjectFactory ，尽管即使从Java类开始也有用例可以利用 <$注释的类似类c $ c> @XmlRegistry ，以便使用 @XmlElementDecl 注释。

An ObjectFactory is not required, although even when starting from Java classes there are use cases where you can leverage a similar class annotated with @XmlRegistry in order to use the @XmlElementDecl annotation.

创建JAXBElement实例

您始终可以创建e JAXBElement 直接：

You can always create the JAXBElement directly:

final JAXBElement<WebLeads> webLeadsElement = new JAXBElement<WebLeads>(
    new QName("root-element-name"), 
    WebLeads.class, 
    webLeadsJavaObj);

替代JAXBElement

或者由于JAXBElement仅用于提供根元素信息，因此您可以使用 @XmlRootElement WebLeads 类>：

Or since JAXBElement is simply used to provide root element information, you can annotate your WebLeads class with @XmlRootElement:

@XmlRootElement(name="root-element-name")
public class WebLeads {
   ...
}

这篇关于Jaxb：我如何生成ObjectFactory类？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！