如何在android-java中解析xml？

Question

在我的应用程序中，我有一个xml文件，我想解析xml文件并从xml标签中提取数据。这是我的xml文件。

<array> 

    <recipe> 

     <name> Crispy Fried Chicken </name> 
     <description> Deliciously Crispy Fried Chicken</description> 
     <prepTime>1.5 hours </prepTime> 
     <instructions>instruction steps</instructions> 

     <ingredients> 

      <item> 
       <itemName>Chicken Parts</itemName> 
       <itemAmount>2 lbs</itemAmount> 
      </item> 

      <item> 
       <itemName>Salt &amp; Peppers</itemName> 
       <itemAmount>As teste</itemAmount> 
      </item> 

     </ingredients> 

    </recipe> 


    <recipe> 

     <name> Bourben Chicken </name> 
     <description> A good recipe! A tad on the hot side!</description> 
     <prepTime>1 hours </prepTime> 
     <instructions>instruction steps</instructions> 

     <ingredients> 

      <item> 
       <itemName>Boneless Chicken</itemName> 
       <itemAmount>2.5 lbs</itemAmount> 
      </item> 

      <item> 
       <itemName>Olive Oil</itemName> 
       <itemAmount>1 -2 tablespoon</itemAmount> 
      </item> 

      <item> 
       <itemName>Olive Oil</itemName> 
       <itemAmount>1 -2 tablespoon</itemAmount> 
      </item> 

     </ingredients> 

    </recipe> 

</array> 

我已经使用DOM解析器来解析上面的XML文件，我从<name>，<description>，<prepTime>和<instructions>标签提取的数据，但我不知道如何从<ingredients> TAG提取数据。你可以看到我为DOM解析器开发的代码。这里是我的DOM解析器

public class DOMParser 
{ 

    // parse Plist and fill in arraylist 
    public ArrayList<DataModel> parsePlist(String xml) 
    { 
     final ArrayList<DataModel> dataModels = new ArrayList<DataModel>(); 

     //Get the xml string from assets XML file 
     final Document doc = convertStringIntoXML(xml); 

//  final NodeList nodes_array = doc.getElementsByTagName("array"); 

     //Iterating through the nodes and extracting the data. 
     NodeList nodeList = doc.getDocumentElement().getChildNodes(); 

     for (int i = 0; i < nodeList.getLength(); i++) 
     { 
      Node node = nodeList.item(i); 
      if (node instanceof Element) 
      { 
       DataModel model = new DataModel(); 

       NodeList childNodes = node.getChildNodes(); 
       for (int j = 0; j < childNodes.getLength(); j++) 
       { 


        Node cNode = childNodes.item(j); 
        if (cNode instanceof Element) 
        { 
         String content = cNode.getLastChild().getTextContent().trim(); 

         if(cNode.getNodeName().equalsIgnoreCase("name")) 
          model.setName(content); 
         else if(cNode.getNodeName().equalsIgnoreCase("description")) 
          model.setDescription(content); 
         else if(cNode.getNodeName().equalsIgnoreCase("prepTime")) 
          model.setPrepTime(content); 
         else if(cNode.getNodeName().equalsIgnoreCase("instructions")) 
          model.setInstructions(content); 
        } 

       } 
       dataModels.add(model); 
      } 
     } 



     return dataModels; 
    } 



    // Create xml document object from XML String 
    private Document convertStringIntoXML(String xml) 
    { 
     Document doc = null; 

     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
     try 
     { 
      DocumentBuilder db = dbf.newDocumentBuilder(); 
      InputSource is = new InputSource(); 
      is.setCharacterStream(new StringReader(xml)); 
      doc = db.parse(is); 
     } 

     catch (ParserConfigurationException e) 
     { 
      System.out.println("XML parse error: " + e.getMessage()); 
      return null; 
     } 

     catch (SAXException e) 
     { 
      System.out.println("Wrong XML file structure: " + e.getMessage()); 
      return null; 
     } 

     catch (IOException e) 
     { 
      System.out.println("I/O exeption: " + e.getMessage()); 
      return null; 
     } 

     return doc; 
    } 
} 

Answer 1

你需要像你这样recipe标签做迭代ingredients子节点。

但更简单的方法是使用XPath。

Answer 2

您可以更改您的代码，如下所示。

public ArrayList<DataModel> parsePlist(String xml) 
{ 
    final ArrayList<DataModel> dataModels = new ArrayList<DataModel>(); 

    //Get the xml string from assets XML file 
    final Document doc = convertStringIntoXML(xml); 
    //final NodeList nodes_array = doc.getElementsByTagName("array"); 

    //Iterating through the nodes and extracting the data. 
    NodeList nodeList = doc.getDocumentElement().getChildNodes(); 

    for (int i = 0; i < nodeList.getLength(); i++) 
    { 
     Node node = nodeList.item(i); 
     if (node instanceof Element) 
     { 
      DataModel model = new DataModel(); 

      NodeList childNodes = node.getChildNodes(); 
      for (int j = 0; j < childNodes.getLength(); j++) 
      { 
Node cNode = childNodes.item(j); 
       if (cNode instanceof Element) 
       { 
        String content = cNode.getLastChild().getTextContent().trim(); 

        if(cNode.getNodeName().equalsIgnoreCase("name")) 
         model.setName(content); 
        else if(cNode.getNodeName().equalsIgnoreCase("description")) 
         model.setDescription(content); 
        else if(cNode.getNodeName().equalsIgnoreCase("prepTime")) 
         model.setPrepTime(content); 
        else if(cNode.getNodeName().equalsIgnoreCase("instructions")) 
         model.setInstructions(content); 
        else if(cNode.getNodeName().equalsIgnoreCase("ingredients")) 
        { 
         Element ingredEle = (Element)cNode; 
         NodeList ingredList = ingredEle 
        .getElementsByTagName("ingredients"); 
         for (int i = 0; i < ingredList.getLength(); i++) 
         { 
          Element item = (Element)ingredList.item(i); 
          if(item.hasChildNodes()) 
          { 
          NodeList itemList = item.getElementsByTagName("item"); 
          for (int j = 0; j < itemList.getLength(); j++) 
          { 
           Element itemEle = (Element)itemList.item(j); 
           if (getNodeValue(itemEle, "itemName") != null) 
           { 

           String name = getNodeValue(itemEle, "itemName"); 
           //set name here 
           } 
           if (getNodeValue(itemEle, "itemAmount") != null) 
           { 

           String amount = getNodeValue(itemEle,"itemAmount"); 
           //set amount here 
           } 
          } 
          } 
         } 
        } 
       } 
    dataModels.add(model); 
     } 
    } 



    return dataModels; 
} 

private String getNodeValue(Element element, String elementTemplateLoc) { 
    NodeList nodes = element.getElementsByTagName(elementTemplateLoc); 
    return getTextNodeValue(nodes.item(0)); 
} 

希望这会为你

工作