Java中具有名称空间的XPath

1. 简短的答案：使用XPath

   local-name()

   。这样：

   xPathFactory.newXPath().compile("//*[local-name()='requestURL']/text()");

   将返回

   /CAMERA/Streaming/status

2. 或者，您可以实现一个

   NamespaceContext

   映射名称空间名称和URI的，并在查询之前在XPath对象上对其进行设置。
3. 看一下这篇博客文章， 更新： 该文章已结束，您可以在webarchive上看到它

解决方案1样本：

XPath xpath = XPathFactory.newInstance().newXPath();String responseStatus = xpath.evaluate("//*[local-name()='ResponseStatus']/text()", document);System.out.println("-> " + responseStatus);

解决方案2样本：

// load the documentdocument document = ...;NamespaceContext ctx = new NamespaceContext() {    public String getNamespaceURI(String prefix) {        return prefix.equals("urn") ? "urn:camera-org" : null;     }    public Iterator getPrefixes(String val) {        return null;    }    public String getPrefix(String uri) {        return null;    }};XPath xpath = XPathFactory.newInstance().newXPath();xpath.setNamespaceContext(ctx);String responseStatus = xpath.evaluate("//urn:ResponseStatus/text()", document);System.out.println("-> " + responseStatus);

编辑

这是一个完整的示例，它可以正确检索元素：

String xml = "<urn:ResponseStatus version="1.0" xmlns:urn="urn:camera-org">rn" + //        "rn" + //        "<urn:requestURL>/CAMERA/Streaming/status</urn:requestURL>rn" + //        "<urn:statusCode>4</urn:statusCode>rn" + //        "<urn:statusString>Invalid Operation</urn:statusString>rn" + //        "<urn:id>0</urn:id>rn" + //        "rn" + //        "</urn:ResponseStatus>";documentBuilderFactory factory = documentBuilderFactory.newInstance();factory.setNamespaceAware(true);documentBuilder builder = factory.newdocumentBuilder();document doc = builder.parse(new java.io.ByteArrayInputStream(xml.getBytes()));XPath xpath = XPathFactory.newInstance().newXPath();xpath.setNamespaceContext(new NamespaceContext() {    public String getNamespaceURI(String prefix) {        return prefix.equals("urn") ? "urn:camera-org" : null;    }    public Iterator<?> getPrefixes(String val) {        return null;    }    public String getPrefix(String uri) {        return null;    }});XPathexpression expr = xpath.compile("//urn:ResponseStatus");Object result = expr.evaluate(doc, XPathConstants.NODESET);NodeList nodes = (NodeList) result;for (int i = 0; i < nodes.getLength(); i++) {    Node currentItem = nodes.item(i);    System.out.println("found node -> " + currentItem.getLocalName() + " (namespace: " + currentItem.getNamespaceURI() + ")");}