您需要设置一个
NamespaceContext上
XPath：
演示版
package forum11644994;import java.io.StringReader;import java.util.Iterator;import javax.xml.namespace.NamespaceContext;import javax.xml.parsers.*;import javax.xml.xpath.*;import org.w3c.dom.document;import org.w3c.dom.NodeList;import org.xml.sax.InputSource;public class Demo { public static void main(String[] args) throws Exception { String xml = "<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.web.post.list.com"><soapenv:Header><authInfo xsi:type="soap:authentication" xmlns:soap="http://list.com/services/SoapRequestProcessor"><!--You may enter the following 2 items in any order--><username xsi:type="xsd:string">dfasf@google.com</username><password xsi:type="xsd:string">PfasdfRem91</password></authInfo></soapenv:Header></soapenv:Envelope>"; System.out.println(xml); documentBuilderFactory domFactory = documentBuilderFactory .newInstance(); domFactory.setNamespaceAware(true); documentBuilder builder = domFactory.newdocumentBuilder(); document doc = builder.parse(new InputSource(new StringReader(xml))); XPath xpath = XPathFactory.newInstance().newXPath(); xpath.setNamespaceContext(new NamespaceContext() { @Override public Iterator getPrefixes(String arg0) { return null; } @Override public String getPrefix(String arg0) { return null; } @Override public String getNamespaceURI(String arg0) { if("soapenv".equals(arg0)) { return "http://schemas.xmlsoap.org/soap/envelope/"; } return null; } }); // XPath Query for showing all nodes value try { XPathexpression expr = xpath .compile("/soapenv:Envelope/soapenv:Header/authInfo/password"); Object result = expr.evaluate(doc, XPathConstants.NODESET); NodeList nodes = (NodeList) result; System.out.println("Got " + nodes.getLength() + " nodes"); // System.out.println(nodes.item(0).getNodevalue()); } catch (Exception E) { System.out.println(E); } }}输出量
<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.web.post.list.com"><soapenv:Header><authInfo xsi:type="soap:authentication" xmlns:soap="http://list.com/services/SoapRequestProcessor"><!--You may enter the following 2 items in any order--><username xsi:type="xsd:string">dfasf@google.com</username><password xsi:type="xsd:string">PfasdfRem91</password></authInfo></soapenv:Header></soapenv:Envelope>Got 1 nodes
