简单的 Java Xml 到 POJO 映射/绑定？
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Simple Java Xml to POJO mapping/binding?
提问by vicsz
I'm trying to figure out the simplest way to map an xml file to to a plain old java object.
我试图找出将 xml 文件映射到普通旧 java 对象的最简单方法。
Note: That in my example the xml doesn't quite match up with my intended POJO.
注意：在我的示例中，xml 与我想要的 POJO 不太匹配。
///////// THE XML
<?xml version="1.0" encoding="UTF-8"?>
<Animal>
<standardName>
<Name>Cat</Name>
</standardName>
<standardVersion>
<VersionIdentifier>V02.00</VersionIdentifier>
</standardVersion>
</Animal>
////// THE INTENDED POJO
class Animal
{
private String name;
private String versionIdentifier;
}
Regular JAXB (with annotations) won't work as the JAXM Element name annotations don't allow me to specifiy nested elements. (i.e. standardName/Name).
常规 JAXB（带注释）将不起作用，因为 JAXM 元素名称注释不允许我指定嵌套元素。（即标准名称/名称）。
I've looked at Jibx but it seems overly complicated, and no full examples are provided for what I want to do.
我看过 Jibx，但它似乎过于复杂，并且没有提供我想要做什么的完整示例。
Castro seems like it would be able to do what I want (using mapping files), but I wonder if there are any other possible solutions. (Possibly that would allow me to skip mapping files, and just allow me to specify everything in annotations).
Castro 似乎可以做我想做的事（使用映射文件），但我想知道是否还有其他可能的解决方案。（这可能允许我跳过映射文件，而只允许我在注释中指定所有内容）。
Thanks
谢谢
采纳答案by vtd-xml-author
This article may help you... it only requires you to know xpath http://onjava.com/onjava/2007/09/07/schema-less-java-xml-data-binding-with-vtd-xml.html
这篇文章可以帮助你...它只需要你知道 xpath http://onjava.com/onjava/2007/09/07/schema-less-java-xml-data-binding-with-vtd-xml.html
回答by bdoughan
EclipseLink JAXB (MOXy)allows you to do the path based mapping that you are looking for:
EclipseLink JAXB (MOXy)允许您执行您正在寻找的基于路径的映射：
@XmlRootElement
class Animal
{
@XmlPath("standardName/Name/text()")
private String name;
@XmlPath("standardVersion/VersionIdentifier/text()");
private String versionIdentifier;
}
For more information see:
有关更多信息，请参阅：
- http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
- http://bdoughan.blogspot.com/2010/07/xpath-based-mapping.html
- http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/MOXyExtensions
- http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
- http://bdoughan.blogspot.com/2010/07/xpath-based-mapping.html
- http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/MOXyExtensions
EclipseLink also allows the metadata to be specified using an external configuration file:
EclipseLink 还允许使用外部配置文件指定元数据：
回答by kdgregory
Jakarta Commons Digestershould do what you want.
Jakarta Commons Digester应该做你想做的。
Alternatively, I would recommend writing a transformation class that uses XPath to retrieve elements from the XML.
或者，我建议编写一个使用 XPath 从 XML 检索元素的转换类。
回答by SingleShot
I consider JiBX the best of the bunch (JAXB, Castor, XMLBeans, etc.), particularly because I favor mapping files over annotations. Admittedly it has a decent learning curve, but the website has a lot of good examples. You must have missed the tutorial.
我认为 JiBX 是同类产品中最好的（JAXB、Castor、XMLBeans 等），特别是因为我更喜欢映射文件而不是注释。不可否认，它有一个不错的学习曲线，但该网站有很多很好的例子。你一定错过了教程。
If you are only going one way (XML --> POJO) you could use Digester.
如果您只采用一种方式（XML --> POJO），您可以使用Digester。
Side comment: I prefer mapping files over annotations because annotations:
旁注：我更喜欢映射文件而不是注释，因为注释：
- clutter the code (especially when using annotations from several products)
- mix concerns (XML, database, etc. in domain layer)
- can only bind to a single XML (or database, or web service, etc.) representation
- 使代码混乱（尤其是在使用来自多个产品的注释时）
- 混合关注点（域层中的 XML、数据库等）
- 只能绑定到单个 XML（或数据库或 Web 服务等）表示
