analizar XML con espacios de nombres en Java utilizando XPath

Question

Estoy tratando de analizar la solicitud SOAP en Java pero el código no devuelve ningún nodo aquí está el código puede alguien encontrar errores

 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 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); 
    } 

---

Answer 1

Es necesario establecer un NamespaceContext en el XPath:

demostración

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); 
     } 

    } 
} 

salida

<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 

Answer 2

Adición de más a la última respuesta .. para obtener el valor determinado nodo puede utilizar la below-- [System.out.println(nodes.item(0).getTextContent());]