無法使用Java從XML讀取節點元素及其值

Question

我無法使用XPath和DOMParser讀取XML元素及其值。 客戶端在我的應用程序中將此XML作為請求發送，我無法控制操作客戶端代碼。 我想使用DOMParser讀取AccountID。

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns="https://billpayment.weaut.com/">
  <soap:Body>
    <GetAccountBalanceByAccount xmlns="https://billpayment.weaut.com/">
      <CompanyName>AABC</CompanyName>
      <Language>ENG</Language>
      <AccountID>54698214</AccountID>
    </GetAccountBalanceByAccount>
  </soap:Body>
</soap:Envelope>

這就是我試圖解析XML以獲取AccountID節點及其內容的方法。

@RequestMapping(value = "/", method = { RequestMethod.POST}, consumes = {"text/xml"}, produces = "text/xml")    
    public ResponseEntity messageStub(@RequestBody String requestString)
            throws ClientProtocolException, IOException {       
        try {           
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            DocumentBuilder db = dbf.newDocumentBuilder();          
            Document doc = db.parse(new InputSource(new StringReader(requestString)));          
            XPathFactory xPathFactory = XPathFactory.newInstance();
            XPath xpath = xPathFactory.newXPath();
            javax.xml.namespace.NamespaceContext ns = new javax.xml.namespace.NamespaceContext()
            {               
                    @Override
                    public String getNamespaceURI(String prefix) 
                    {
                        if ( "soap".equals( prefix ) )
                        {                           
                            return "http://www.w3.org/2003/05/soap-envelope";
                        }                                                                                                              
                        return javax.xml.XMLConstants.NULL_NS_URI;
                   }
                   @Override
                   public String getPrefix(String namespaceURI) 
                   {
                      return null;
                   }
                    @Override
                    public Iterator<?> getPrefixes(String namespaceURI) 
                    {
                        return null;
                    }
            };       
            xpath.setNamespaceContext(ns);
            String nodeName="", nodeContent="";         
            NodeList nodeList = null;
            //XML Path
            String chkXMLPath="/soap:Envelope/soap:Body/GetAccountBalanceByAccount/AccountID";

            XPathExpression expr = xpath.compile(chkXMLPath);      
            //evaluating each node set against the requested xml
            Object result = expr.evaluate(doc, XPathConstants.NODESET);
            nodeList = (NodeList) result;                   
            //Here I am getting 0 node
            System.out.println("Got " + nodeList.getLength() + " nodes");                               
            for (int i = 0; i < nodeList.getLength(); i++) 
            {                                               
                nodeName = nodeList.item(i).getNodeName();
                nodeContent = nodeList.item(i).getTextContent();                        
                System.out.println("\nCurrent Element :" + nodeName);
                System.out.println("\nCurrent Value :" + nodeContent);
                break;
            }                                                                   
        }
    }

當我從兩個位置刪除xmlns命名空間后測試此方法時，我能夠讀取元素及其內容。 您能否建議我如何在不修改XML的情況下閱讀AccountID及其內容。

Answer 1

雖然我已經通過從XML中刪除xmlns名稱空間來解決了這個問題。 我使用以下方法來執行此操作。 這為我提供了適當的XML。

public static String RemoveAllXmlNamespace(String xmlData)
     {
     //Regex for xmlNS
         String xmlnsRegex = "\\s+xmlns\\s*(:\\w)?\\s*=\\s*\\\"(?<url>[^\\\"]*)\\\"";
         Pattern p = Pattern.compile(xmlnsRegex);
         Matcher m = p.matcher(xmlData); //get a matcher object
         int count = 0;
         while(m.find())
         {                 
           String replaceString= xmlData.substring(m.start(), m.end());
           //Removing xmlNS from the XML String
           xmlData = xmlData.replace(replaceString, "");
           System.out.println("xmlData: "+xmlData);
           break;
         }
         return xmlData;
    }

上面的代碼是我認為擺脫不需要的命名空間最安全的方法。 此方法在輸出中提供以下XML。

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
  <soap:Body>
    <GetAccountBalanceByAccount>
      <CompanyName>AABC</CompanyName>
      <Language>ENG</Language>
      <AccountID>54698214</AccountID>
    </GetAccountBalanceByAccount>
  </soap:Body>
</soap:Envelope>