[英]JAXB Unmarshalling an subset of Unknown XML content
I have a requirement to unmarshall
a subset of Unknown XML
content, with that unmarshalled object, I need modify some contents and re-bind the same XML content(subset) with the Original XML. 我需要unmarshall
组未知XML
内容的子集,使用该未编组的对象,我需要修改一些内容并使用原始XML重新绑定相同的XML内容(子集)。
Sample Input XML: 示例输入XML:
<Message>
<x>
</x>
<y>
</y>
<z>
</z>
<!-- Need to unmarshall this content to "Content" - java Object -->
<Content>
<Name>Robin</Name>
<Role>SM</Role>
<Status>Active</Status>
</Content>
.....
</Message>
Need to unmarshall the <Content>
tag alone, by keeping the other XML part as same. 需要通过将其他XML部分保持相同来单独解组<Content>
标记。 Need to modify the elements in <Content>
tag and bind the modified XML part with the original as shown below: 需要修改<Content>
标记中的元素并将修改后的XML部分与原始文件绑定,如下所示:
Expected Output XML: 预期输出XML:
<Message>
<x>
</x>
<y>
</y>
<z>
</z>
<!-- Need to unmarshall this content to "Content" - java Object -->
<Content>
<Name>Robin_123</Name>
<Role>Senior Member</Role>
<Status>1</Status>
</Content>
.....
</Message>
My Questions: 我的问题:
What is the possible solution for this Requirement ? 这个要求的可能解决方案是什么? (Except DOM
parsing - as XML contnet is very huge) (除了DOM
解析 - 因为XML contnet非常庞大)
Is there any option to do this in JAXB2.0
? 在JAXB2.0
有没有选择呢?
Please provide your suggestions on this. 请提供您的建议。
Consider cutting your source document down to size using the StAX API . 考虑使用StAX API将源文档缩小到适当大小。
For the given sample, this code creates a DOM document with a root element of the Content
element: 对于给定的示例,此代码创建一个DOM文档,其中包含Content
元素的根元素:
class ContentFinder implements StreamFilter {
private boolean capture = false;
@Override public boolean accept(XMLStreamReader xml) {
if (xml.isStartElement() && "Content".equals(xml.getLocalName())) {
capture = true;
} else if (xml.isEndElement() && "Content".equals(xml.getLocalName())) {
capture = false;
return true;
}
return capture;
}
}
XMLInputFactory inFactory = XMLInputFactory.newFactory();
XMLStreamReader reader = inFactory.createXMLStreamReader(inputStream);
reader = inFactory.createFilteredReader(reader, new ContentFinder());
Source src = new StAXSource(reader);
DOMResult res = new DOMResult();
TransformerFactory.newInstance().newTransformer().transform(src, res);
Document doc = (Document) res.getNode();
This can then be passed to JAXB as a DOMSource . 然后可以将其作为DOMSource 传递给JAXB 。
Similar techniques can be used when rewriting the XML on output. 在输出上重写XML时可以使用类似的技术。
JAXB doesn't seem to accept a StreamSource
directly, at least in the Oracle 1.7 implementation. JAXB似乎不直接接受StreamSource
,至少在Oracle 1.7实现中是这样。
You can annotate an Object
property on your class with @XmlAnyElement
and by default the unmapped content will be captured as a DOM nodes. 您可以使用@XmlAnyElement
在类上注释Object
属性,默认情况下,未映射的内容将作为DOM节点捕获。 If you specify a DomHandler
on the @XmlAnyElement
then you can control the format. 如果指定DomHandler
上@XmlAnyElement
那么你可以控制的格式。 Here is a link to an example where the content is kept as a String
. 以下是一个示例的链接,其中内容保存为String
。
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