Parse XML với namespace trong Java sử dụng xpath

Question

Tôi cố gắng để phân tích yêu cầu SOAP trong java nhưng mã không được trả lại bất kỳ nút đây là mã ai có thể tìm thấy lỗi

 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

Bạn cần phải thiết lập một NamespaceContext trên XPath:

Demo

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); 
     } 

    } 
} 

Output

<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

Thêm một số chi tiết để trả lời mới nhất .. Để có được giá trị nút đặc biệt mà bạn có thể sử dụng below-- [System.out.println(nodes.item(0).getTextContent());]