JAXBContext 和 @XmlNsForm 注释
请阐明 JAXBContext 配置。 给定：
- 客户库
com.mycompany.user01234有几个 JAXB 注释的类 - 所有类都是位于同一包中的简单 POJO
- 类由
@XmlType注释
客户将 com.mycompany.user01234.UserClass1.class 实例编组到服务器通过 Web 服务端点。在服务器端，我执行以下操作：
JAXBContext jbc = JAXBContext.newInstance("com.mycompany.user01234")
Unmarshaller um = jbc.createUnmarshaller();
JAXBElement<Object> element = um.unmarshal(source, Object.class);
Object customerInput = element.getValue();
仅如果我使用以下 package-info.java 修补客户库，它就可以正常工作：
@XmlSchema(elementFormDefault = XmlNsForm.QUALIFIED)
package com.mycompany.user01234;
令我羞愧的是，我还没有找到任何明确的解释这个@XmlNsForm 注释是什么以及它如何影响解组过程。这是第一个问题。
第二个问题是是否可以（在给定的布局中）将该 QUALIFIED 值放入 JAXBContext 的某些属性或默认值中，或者使用其他非声明性方式允许获取摆脱package-info.java。
非常感谢！
Please shed some light on JAXBContext configutation.
Given:
- customer library
com.mycompany.user01234with several
JAXB-annotated classes - all classes are simple POJOs located in the same package
- classes are annotated by
@XmlType
Customer marshals instance of com.mycompany.user01234.UserClass1.class to the server via web service endpoint. On the server side I do the following:
JAXBContext jbc = JAXBContext.newInstance("com.mycompany.user01234")
Unmarshaller um = jbc.createUnmarshaller();
JAXBElement<Object> element = um.unmarshal(source, Object.class);
Object customerInput = element.getValue();
And it works fine ONLY if I patch customer library with following package-info.java:
@XmlSchema(elementFormDefault = XmlNsForm.QUALIFIED)
package com.mycompany.user01234;
To my shame I havent found any clear explanation of what this @XmlNsForm annotation is and how it affects unmarshalling process. This is the first question.
The second question is whether it is possible (in the given layout) to put that QUALIFIED value into some properties or defaults for JAXBContext or use other non-declarative means allowing to get rid of package-info.java.
Many thanks in advance!
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它与
elementFormDefault属性完全对应。它的作用（使用该常量）是声明模式定义的命名空间中的元素应该使用限定符呈现（即，作为您可能想尝试通过传入您期望的类来创建您的
JAXBContext，这样您就可以减少对发现代码的依赖（假设它是一个真正的FooBar类）正在生成）：（上面的代码是从我在代码测试套件中所做的事情中抽象出来的，这些事情肯定已经可以工作了。）
It corresponds exactly to the
elementFormDefaultattribute of an<xs:schema>element (i.e., the top-level element of an XML Schema document). What it does (with that constant) is state that elements from the namespace defined by the schema should be rendered with a qualifier (i.e., as<foo:bar>instead of<bar>); the exact way that the namespace is declared will also vary between the two styles. In terms of the XML infoset, the two styles are completely equivalent; if namespaces are declared correctly in the XML, JAXB should be equally happy (I believe it should only use the value when serializing).You might want to try making your
JAXBContextby passing in the class that you are expecting so that you are a little less reliant on discovery code (assuming it's aFooBarclass that's really being produced):(The above code is abstracted from things that I do in my code's test suite that definitely already work.)