Attribute aus XML Auslesen

[dior]

Hallo,

ich habe eine XML in folgendem Format:

<?xml version="1.0" encoding="utf-8"?>
<RealTimeNetworkStatus FormatVersion="1.1" Generator="TestGenerator">
  <Date>2015-08-07</Date>
  <Time>12:06:00.0</Time>
  <ElevationMask>10.0</ElevationMask>
  <NetworkClusters>
    <Cluster Name="Cluster1">
      <SatelliteSystems>
        <System Name="GPS">
          <Site Name="Kls1" visible="4" visible2="0" visible3="8"/>
          <Site Name="Trz1" visible="8" visible2="8" visible3="6"/>
          <Site Name="Blo1" visible="8" visible2="8" visible3="8"/>
          <Site Name="Lea1" visible="8" visible2="8" visible3="3"/>
          <Site Name="Lad1" visible="8" visible2="8" visible3="7"/>
          <Site Name="Lia1" visible="8" visible2="8" visible3="8"/>
          <Site Name="Kos1" visible="8" visible2="7" visible3="6"/>
          <Site Name="Sxc1" visible="8" visible2="8" visible3="5"/>
        </System>
        <System Name="Cluster2">
          <Site Name="Kls1" visible="7" visible2="7" visible3="6"/>
          <Site Name="Trz1" visible="7" visible2="7" visible3="3"/>
          <Site Name="Blo1" visible="7" visible2="7" visible3="6"/>
          <Site Name="Lea1" visible="7" visible2="7" visible3="5"/>
          <Site Name="Lad1" visible="7" visible2="7" visible3="6"/>
          <Site Name="Lia1" visible="7" visible2="7" visible3="6"/>
          <Site Name="Kos1" visible="7" visible2="7" visible3="5"/>
          <Site Name="Sxc1" visible="7" visible2="7" visible3="4"/>
        </System>
      </SatelliteSystems>
    </Cluster>
  </NetworkClusters>
</RealTimeNetworkStatus>

ich schaffe es aber nicht die Site Attribute auszulesen.
Ich bräuchte am besten jedes Attribut in einer Liste.

Mein bisheriger Versuch sieht so aus:

SAXBuilder saxBuilder = new SAXBuilder();

  Document document = saxBuilder.build(inputFile);
  System.out.println("Root element :"
  + document.getRootElement().getName());

  Element classElement = document.getRootElement();

  List<Element> Cluster = classElement.getChildren();
  List<Attribute> Cluster2 = classElement.getAttributes();
  System.out.println(Cluster.toString());
  System.out.println(Cluster2.toString());
  System.out.println("----------------------------");

  Document doc = (Document) saxBuilder.build(xmlFile);

  List stations = doc.getRootElement().getChildren("Site");
  for (int i = 1; i <= stations.size(); i++) {
  Element stationen = (Element) stations.get(i);
  String name = stationen.getAttributeValue("Name");
  System.out.println("Site Name: " + name);
  }

Es wäre echt nett wenn mir hierbei jemand helfen könnte!

danke

 

[Flown]

Du verwendest JDOM sehe ich das richtig?

Würde es dir auch mit dem normalen DOM-Parser reichen?

String s = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n"
     + "<RealTimeNetworkStatus FormatVersion=\"1.1\" Generator=\"TestGenerator\">\r\n"
     + "  <Date>2015-08-07</Date>\r\n" + "  <Time>12:06:00.0</Time>\r\n"
     + "  <ElevationMask>10.0</ElevationMask>\r\n" + "  <NetworkClusters>\r\n"
     + "  <Cluster Name=\"Cluster1\">\r\n" + "  <SatelliteSystems>\r\n"
     + "  <System Name=\"GPS\">\r\n"
     + "  <Site Name=\"Kls1\" visible=\"4\" visible2=\"0\" visible3=\"8\"/>\r\n"
     + "  <Site Name=\"Trz1\" visible=\"8\" visible2=\"8\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Blo1\" visible=\"8\" visible2=\"8\" visible3=\"8\"/>\r\n"
     + "  <Site Name=\"Lea1\" visible=\"8\" visible2=\"8\" visible3=\"3\"/>\r\n"
     + "  <Site Name=\"Lad1\" visible=\"8\" visible2=\"8\" visible3=\"7\"/>\r\n"
     + "  <Site Name=\"Lia1\" visible=\"8\" visible2=\"8\" visible3=\"8\"/>\r\n"
     + "  <Site Name=\"Kos1\" visible=\"8\" visible2=\"7\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Sxc1\" visible=\"8\" visible2=\"8\" visible3=\"5\"/>\r\n"
     + "  </System>\r\n" + "  <System Name=\"Cluster2\">\r\n"
     + "  <Site Name=\"Kls1\" visible=\"7\" visible2=\"7\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Trz1\" visible=\"7\" visible2=\"7\" visible3=\"3\"/>\r\n"
     + "  <Site Name=\"Blo1\" visible=\"7\" visible2=\"7\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Lea1\" visible=\"7\" visible2=\"7\" visible3=\"5\"/>\r\n"
     + "  <Site Name=\"Lad1\" visible=\"7\" visible2=\"7\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Lia1\" visible=\"7\" visible2=\"7\" visible3=\"6\"/>\r\n"
     + "  <Site Name=\"Kos1\" visible=\"7\" visible2=\"7\" visible3=\"5\"/>\r\n"
     + "  <Site Name=\"Sxc1\" visible=\"7\" visible2=\"7\" visible3=\"4\"/>\r\n"
     + "  </System>\r\n" + "  </SatelliteSystems>\r\n" + "  </Cluster>\r\n"
     + "  </NetworkClusters>\r\n" + "</RealTimeNetworkStatus>";

try {
   Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
       .parse(new InputSource(new StringReader(s)));

   doc.getDocumentElement().normalize();
   NodeList sites = doc.getElementsByTagName("Site");
   for (int i = 0; i < sites.getLength(); i++) {
     Node cur = sites.item(i);
     NamedNodeMap attributes = cur.getAttributes();
     Node name = attributes.getNamedItem("Name");
     System.out.println(i + ": " + name.getNodeValue());
   }
} catch (SAXException | IOException | ParserConfigurationException e) {
   e.printStackTrace();
}

EDIT: Mit JDOM musst du mit der Funktion document.getRootElement().getDescendants(...); suchen:

try {
   Document document = new SAXBuilder().build(new InputSource(new StringReader(s)));

   for (Element e : document.getRootElement().getDescendants(new ElementFilter("Site"))) {
     System.out.println(e.getAttributeValue("Name"));
   }
} catch (JDOMException | IOException e) {
   e.printStackTrace();
}

 

[dior]

Hallo Flown,

vielen Dank.... das hat Funktioniert!

Noch eine Frage, kann ich so auch einfach auf einzelne Elemente zugreifen? Also nicht alle Auflisten sondern z.B. Zeig mir visible3 bei Name = Kls1 / Cluster1.

 

[dior]

Ich hab das jetzt einfach so gemacht (keine Ahnung ob es der beste Weg oder komplett umständlich ist...):

List<Pair> mPairs = new ArrayList<Pair>();
   Pair pair;
    for (Element e : document.getRootElement().getDescendants(new ElementFilter("Site"))) {
      System.out.println("Name: " + e.getAttributeValue("Name") + " - Visible: " + e.getAttributeValue("visible"));
      //System.out.println("aaaaa: " + e.getValue());
      pair = new Pair(e.getAttributeValue("Name"), e.getAttributeValue("visible"));
      mPairs.add(pair);
    }
   
    System.out.println(mPairs.get(3));

 

[Flown]

Du kannst mit XPath arbeiten, dann sieht die Query ca. so aus:

List<Attribute> evaluation = XPathFactory.instance()
     .compile("//Cluster[@Name='Cluster1']//Site[@Name='Kls1']/@visible3", new AttributeFilter())
     .evaluate(document);
for (Attribute a : evaluation) {
   System.out.println(a);
}

Dazu brauchst du eine extra Library die: jaxen.jar

 

[dior]

Danke!!