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XPath avec espace de noms en Java

Je voudrais obtenir tout le contenu entre les balises mais je ne sais pas comment faire cela à cause de l'urne: namespace.

<urn:ResponseStatus version="1.0" xmlns:urn="urn:camera-org">

<urn:requestURL>/CAMERA/Streaming/status</urn:requestURL>
<urn:statusCode>4</urn:statusCode>
<urn:statusString>Invalid Operation</urn:statusString>
<urn:id>0</urn:id>

</urn:ResponseStatus>

Des idées?

javaxpathnamespaces
16
Sergiu
  1. Réponse courte: utilisez XPath local-name(). Comme ceci: xPathFactory.newXPath().compile("//*[local-name()='requestURL']/text()"); retournera /CAMERA/Streaming/status
  2. Vous pouvez également implémenter une variable NamespaceContext qui mappe les noms d'espaces de nom et les URI et la définir sur l'objet XPath avant d'effectuer une requête.
  3. Jetez un coup d'œil à cet article de blog } _, Mise à jour: l'article est en panne, vous pouvez le voir sur webarchive

Exemple de solution 1:

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

Exemple de solution 2:

// load the Document
Document 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);

Modifier

Ceci est un exemple complet, il récupère correctement l'élément:

String xml = "<urn:ResponseStatus version=\"1.0\" xmlns:urn=\"urn:camera-org\">\r\n" + //
        "\r\n" + //
        "<urn:requestURL>/CAMERA/Streaming/status</urn:requestURL>\r\n" + //
        "<urn:statusCode>4</urn:statusCode>\r\n" + //
        "<urn:statusString>Invalid Operation</urn:statusString>\r\n" + //
        "<urn:id>0</urn:id>\r\n" + //
        "\r\n" + //
        "</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() + ")");
}
31
Alex

XML ​​ xpath with Espace de noms

XML simple

String namespaceXML = "<?xml version='1.0' ?><information><person id='1'><name>Deep</name><age>34</age><gender>Male</gender></person>  <person id='2'><name>Kumar</name><age>24</age><gender>Male</gender></person> <person id='3'><name>Deepali</name><age>19</age><gender>Female</gender></person><!-- more persons... --></information>";
String jsonString = "{}";
String expression = "//information";

Espace de nom XML

String namespaceXML = "<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\"><soap:Body><m:NumberToDollarsResponse xmlns:m=\"http://www.dataaccess.com/webservicesserver/\"><m:NumberToDollarsResult>nine hundred and ninety nine dollars</m:NumberToDollarsResult></m:NumberToDollarsResponse></soap:Body></soap:Envelope>";
String jsonString = "{'soap':'http://schemas.xmlsoap.org/soap/envelope/', 'm':'http://www.dataaccess.com/webservicesserver/'}";
String expression = "//m:NumberToDollarsResponse/m:NumberToDollarsResult/text()";

Fournissez le fichier xml d'espace de noms sous forme de chaîne, à la méthode asscerionXpath(namespaceXML, jsonString, expression) et obtenez le résultat sous la forme texte/noeud.

text (): nine hundred and ninety nine dollars

noeud: <m:NumberToDollarsResult xmlns:m="http://www.dataaccess.com/webservicesserver/"> nine hundred and ninety nine dollars </m:NumberToDollarsResult>

public static String asscerionXpath(String namespaceXML, String jsonString, String expression){
    if(namespaceXML.indexOf("><") > -1) namespaceXML = namespaceXML.replace("><", ">\r\n<");
    if(jsonString.indexOf("'") > -1)    jsonString = jsonString.replace("'", "\"");

    System.out.println("namespaceXML : \n"+namespaceXML);
    System.out.println("nsmespaces : \n"+jsonString);

    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setValidating(false);
    factory.setNamespaceAware(true);
    factory.setIgnoringComments(true);
    factory.setIgnoringElementContentWhitespace(true);
    try {
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document source = builder.parse( string2Source(namespaceXML) );
        XPath xpath = XPathFactory.newInstance().newXPath();

        addNameSpaces(jsonString, xpath);
        // An XPath expression is not thread-safe. Make sure it is accessible by only one Thread.
        XPathExpression expr = xpath.compile(expression);

        // The NodeList interface provides the abstraction of an ordered collection of nodes,
        NodeList nodes = (org.w3c.dom.NodeList) expr.evaluate(source, XPathConstants.NODESET);;
        Node tree_base = nodes.item(0);
        return document2String(tree_base);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (SAXException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (ParserConfigurationException e) {
        e.printStackTrace();
    } catch (XPathExpressionException e) {
        System.out.println("If the expression cannot be evaluated.");
    }
    return "";
}
static InputSource string2Source( String str ) {
    InputSource inputSource = new InputSource( new StringReader( str ) );
    return inputSource;
}
static void addNameSpaces(String jsonString, XPath xpath) {
    JSONParser parser = new JSONParser();
    try {
        JSONObject namespaces = (JSONObject) parser.parse(jsonString);

        if (namespaces.size() > 0) {
            final JSONObject declaredPrefix = namespaces; // To access in Inner-class.
            NamespaceContext nameSpace = new NamespaceContext() {
                // To get all prefixes bound to a Namespace URI in the current scope, XPath 1.0 specification
                // --> "no prefix means no namespace"
                public String getNamespaceURI(String prefix) {
                    Iterator<?> key = declaredPrefix.keySet().iterator();
                    System.out.println("Keys : "+key.toString());
                    while (key.hasNext()) {
                        String name = key.next().toString();
                        if (prefix.equals(name)) {
                            System.out.println(declaredPrefix.get(name));
                            return declaredPrefix.get(name).toString();
                        }
                    }
                    return "";
                }
                public Iterator<?> getPrefixes(String val) {
                    return null;
                }
                public String getPrefix(String uri) {
                    return null;
                }
            };// Inner class.

            xpath.setNamespaceContext( nameSpace );
        }

    } catch ( org.json.simple.parser.ParseException e) {
        e.printStackTrace();
    }
}
0
Yash