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我正在使用一個函數,它接受兩個DOM元素 - 來自不同文檔的父代和子代。我導入子元素,將其轉換,然後將其附加到父元素。但是,以下代碼中的最後一行是拋出一個dom異常:org.w3c.dom.DOMException:WRONG_DOCUMENT_ERR:節點在與創建節點不同的文檔中使用。轉換和添加Dom節點
請參閱下面我的代碼:
public void attachNodeToParent (Element parent, Element child) throws Exception {
Document parent_doc = parent.getOwnerDocument();
child = (Element)parent_doc.importNode(child, true);
// Imported child Element is shown below:
// <node id="101">
// <node id="102">
// <node id="103" />
// </node>
// <node id="104">
// <node id="103" />
// </node>
// </node>
// convert child Element into String
Source source = new DOMSource(child);
StringWriter stringWriter = new StringWriter();
Result result = new StreamResult(stringWriter);
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.transform(source, result);
String childXml = stringWriter.getBuffer().toString();
// Recursively modify the id attributes of every node
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(new StringReader(childXml)));
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
NodeList nodes = (NodeList) xpath.compile("//node[@id]").evaluate(doc, XPathConstants.NODESET);
for (int nodeNumber = 0; nodeNumber < nodes.getLength(); ++nodeNumber) {
final Element node = (Element) nodes.item(nodeNumber);
final String nodeId = node.getAttribute("id");
final String newNodeId = "prefix/" + nodeId;
node.getAttributeNode("id").setValue(newNodeId);
}
final StringWriter writer = new StringWriter();
transformer.transform(source, new StreamResult(writer));
writer.flush();
writer.close();
String transformedChildXml = writer.toString();
// Prase transformedChildXml String into XML
dbf.setNamespaceAware(true);
DocumentBuilder builder = dbf.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(transformedChildXml)));
document.setXmlStandalone(false);
child = document.getDocumentElement();
// child Element is now transformed to:
// <node id="prefix/101">
// <node id="prefix/102">
// <node id="prefix/103" />
// </node>
// <node id="prefix/104">
// <node id="prefix/103" />
// </node>
// </node>
// append transformed child Element to parent Element
// Throws o rg.w3c.dom.DOMException: WRONG_DOCUMENT_ERR:
// A node is used in a different document than the one that created it.
parent.appendChild(child);
}
最初導入節點後,我不確定如何遞歸轉換ID。如果節點有多個子級(在我的例子中是2個子級),那麼我是否遞歸循環遍歷每個級別? – sony 2012-01-27 01:32:16
是的,您可以使用遞歸來遍歷DOM樹,或者您可以像使用xpath一樣使用id來訪問節點集。只需將「evaluate」的第一個參數更改爲「child」,將xpath更改爲「」.// node [@id]「' – Alohci 2012-01-27 07:26:17
目標Element上的xpath」.//node[@id]「返回NodeList只有子節點。假設目標爲「 。然後只有id爲102和103的節點,但節點爲id =」101「目標元素本身的根目錄沒有被返回,所以我首先修改了目標的根目錄,然後修改了所有的子節點,這看起來不太漂亮,這就是爲什麼我從XML到String來回解析的原因。 –
sony
2012-01-27 14:32:16