[英]JAX-B / JSON: inheritance, composite-pattern, unmarshal exception
i'm working on a RESTful WebService (NetBeans + Jersey) and trying to realize a UI-Description (Label, Buttons,...) for mobile Apps (Android). 我正在研究RESTful WebService(NetBeans + Jersey),并试图实现针对移动应用程序(Android)的UI描述(标签,按钮等)。
I used the Composite-Design-Pattern to create a UIContainer, UIBasicElements, UIComplexElements, and so on... 我使用Composite-Design-Pattern来创建UIContainer,UIBasicElements,UIComplexElements等。
My Problem is: The UIContainer contains a private List<UIComponent> uiComponents;
我的问题是:UIContainer包含一个
private List<UIComponent> uiComponents;
. 。
If i add 如果我添加
@XmlSeeAlso( {
UIBasicLabel.class,
UIBasicIcon.class,
UIBasicButton.class,
...
} )
to the class public abstract class UIComponent
i get the JSON-Format i want, ie something like 到类
public abstract class UIComponent
我得到了我想要的JSON格式,即类似
{ ..., uiComponents : [ {Label} , {Icon} , ... ] , ... }
which i can process on my Android-Client. 我可以在我的Android客户端上进行处理。 I also noticed, that a
@type : ClassName
property is added to the JSON-Output. 我还注意到,
@type : ClassName
属性被添加到JSON-Output中。 Isn't this added to give the unmarshaller a hint, what class to use? 是否不是为了给解组员一个提示而添加的,使用什么类?
With the Jersey-Client i get an Exception on unmarshalling: 使用Jersey-Client,我在解组时遇到异常:
Exception in thread "main" javax.ws.rs.WebApplicationException: javax.xml.bind.UnmarshalException
- with linked exception:
[com.sun.istack.internal.SAXParseException2; lineNumber: 0; columnNumber: 0; Unable to create an instance of de.materna.mobile.management.entities.uidescription.UIComponent]
As far as i understand, i need to modify the UIContainer.class to 据我了解,我需要将UIContainer.class修改为
@XmlElementRef
private List<UIComponent> uiComponents;
so the unmarshaller knows what to deserialize here. 因此,解组员知道要在这里反序列化什么。
However, my Problem is, with @XmlElementRef
the JSON becomes this: 但是,我的问题是,使用
@XmlElementRef
,JSON变为:
{ ..., Label : [ ... ] , Icon : [ ... ], ... }
instead of 代替
{ ..., uiComponents : [ {Label} , {Icon} , ... ] , ... }
Is there any way to accomplish both? 有什么办法可以做到这两者?
Thank you very much! 非常感谢你!
PS: sorry for my bad english - i hope it's not too hard to read/understand PS:对不起,我的英语不好-我希望阅读/理解不是太难
从描述对象模型的XML模式开始,然后运行xjc或wsimport(来自JDK的工具),它们将生成您的Java类。
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