使用DOM解析器进行xml解析

问题描述：

我需要在android中使用DOM解析器解析文档。我无法打印所有节点值我的样本XML是：`使用DOM解析器进行xml解析

<xml_api_reply version="1"> 
<news module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0"> 
<title data="Top Stories"/> 
<section_type data="0"/> 
<news_entry> 
<title data="BSE Sensex breaches 19000, Nifty above 5800"/> 
<url data="http://in.reuters.com/article/2012/10/04/sensex-above-19000-on-reform-hopes-   idINDEE89301O20121004"/> 
<snippet data="| MUMBAI (Reuters) - The Nifty rose above 5800 points on Thursday,  joining the Sensex in breaching key psychological levels, after continued government reform measures sparked hopes for continued action. Banks led gainers, with ICICI Bank (ICBK."/> 
<source data="Reuters India"/> 
<date data="3 hours ago"/> 
<num_related data="145"/> 
<cluster_url data="http://google.co.in/news/story?ncl=da6VmeBXmuquikM&hl=en"/> 
</news_entry> 
<news_entry> 
<title data="Uncertainty over Kingfisher resuming operations tomorrow"/> 
<url data="http://www.hindustantimes.com/India-news/NewDelhi/Uncertainty-over- Kingfisher-resuming-operations-tomorrow/Article1-939628.aspx"/> 
<snippet data="Hopes of ailing Kingfisher Airlines resuming operations on Friday has faded with last ditch efforts by the management to persuade striking engineers and pilots to return to work failing to end the deadlock over the issue of non-payment of salaries for ..."/> 
<source data="Hindustan Times"/> 
<date data="1 hour ago"/> 
<num_related data="993"/> 
<cluster_url data="http://google.co.in/news/story?ncl=dzf460GzYKTOyxM&hl=en"/> 
</news_entry> 
</news> 
</xml_api_reply>`

，我使用下面的代码来解析XML

xmlactivity.java

public class AndroidXMLParsingActivity extends ListActivity { 

// All static variables 
static final String URL = "http://www.google.co.in/ig/api?news&hl=en"; 
// XML node keys 
static final String KEY_ITEM = "news"; // parent node 
//static final String KEY_ID = "news_entry"; 
static final String KEY_NAME = "title "; 
static final String KEY_COST = "url "; 
static final String KEY_DESC = "snippet"; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); 

    XMLParser parser = new XMLParser(); 
    String xml = parser.getXmlFromUrl(URL); // getting XML 
    Document doc = parser.getDomElement(xml); // getting DOM element 

    NodeList nl = doc.getElementsByTagName(KEY_ITEM); 
    // looping through all item nodes <item> 
    for (int i = 0; i < nl.getLength(); i++) { 
     // creating new HashMap 
     HashMap<String, String> map = new HashMap<String, String>(); 
     Element e = (Element) nl.item(i); 

     // adding each child node to HashMap key => value 
     //map.put(KEY_ID, parser.getValue(e, KEY_ID)); 
     map.put(KEY_NAME, parser.getValue(e, KEY_NAME)); 
     //map.put(KEY_COST, parser.getValue(e, KEY_COST)); 
     //map.put(KEY_DESC, parser.getValue(e, KEY_DESC)); 

     // adding HashList to ArrayList 
     menuItems.add(map); 
    } 

    // Adding menuItems to ListView 
/* ListAdapter adapter = new SimpleAdapter(this, menuItems, 
      R.layout.list_item, 
      new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] { 
        R.id.name, R.id.desciption, R.id.cost });*/ 

    ListAdapter adapter = new SimpleAdapter(this, menuItems, 
      R.layout.list_item, 
      new String[] { KEY_NAME }, new int[] { 
        R.id.name}); 
    setListAdapter(adapter); 

    // selecting single ListView item 
    ListView lv = getListView(); 

    lv.setOnItemClickListener(new OnItemClickListener() { 


     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 
      // getting values from selected ListItem 
      //String name = ((TextView)  view.findViewById(R.id.name)).getText().toString(); 
      //String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString(); 
      String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString(); 

      // Starting new intent 
      Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class); 
      //in.putExtra(KEY_NAME, name); 
      //in.putExtra(KEY_COST, cost); 
      in.putExtra(KEY_DESC, description); 
      startActivity(in); 

     } 
    });

和XMLPARSER。 java的

public class XMLParser { 

// constructor 
public XMLParser() { 

} 

/** 
* Getting XML from URL making HTTP request 
* @param url string 
* */ 
public String getXmlFromUrl(String url) { 
    String xml = null; 

    try { 
     // defaultHttpClient 
     DefaultHttpClient httpClient = new DefaultHttpClient(); 
     HttpPost httpPost = new HttpPost(url); 

     HttpResponse httpResponse = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpResponse.getEntity(); 
     xml = EntityUtils.toString(httpEntity); 

    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    // return XML 
    return xml; 
} 

/** 
* Getting XML DOM element 
* @param XML string 
* */ 
public Document getDomElement(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) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } catch (SAXException e) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } catch (IOException e) { 
      Log.e("Error: ", e.getMessage()); 
      return null; 
     } 

     return doc; 
} 

/** Getting node value 
    * @param elem element 
    */ 
public final String getElementValue(Node elem) { 
    Node child; 
    if(elem != null){ 
     if (elem.hasChildNodes()){ 
      for(child = elem.getFirstChild(); child != null; child = child.getNextSibling()){ 
       if(child.getNodeType() == Node.TEXT_NODE ){ 
        return child.getNodeValue(); 
       } 
      } 
     } 
    } 
    return ""; 
} 

/** 
    * Getting node value 
    * @param Element node 
    * @param key string 
    * */ 
public String getValue(Element item, String str) {  
     NodeList n = item.getElementsByTagName(str);   
     return this.getElementValue(n.item(0)); 
    }

}

请帮帮我。有什么问题和建议在此先感谢!!!!!!!!!

把UR日志猫错误 –

我只是建议你使用SAX或XmlPullParser而不是DOM。 – Dharmendra

答

//Try this code.. 


     public String getXmlFromUrl(String url) { 
       String xml = null; 

       try { 
        // defaultHttpClient 

        URLConnection conn = null; 
        InputStream inputStream = null; 
        URL urls = new URL(url); 
        conn = urls.openConnection(); 
        conn.setConnectTimeout(10000); 
        HttpURLConnection httpConn = (HttpURLConnection) conn; 
        httpConn.setRequestMethod("GET"); 
        httpConn.setConnectTimeout(10000); 
        httpConn.connect(); 
        if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) { 
         inputStream = httpConn.getInputStream(); 
        } 
        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream)); 
        StringWriter writer=new StringWriter(); 
        String line=""; 
        while (null!=(line=in.readLine())){ 
         writer.write(line); 
        } 
        xml =writer.toString(); 

     } catch (UnsupportedEncodingException e) { 
        e.printStackTrace(); 
       } catch (ClientProtocolException e) { 
        e.printStackTrace(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 

       return xml; 
     } 




     public Document getDomElement(String xml){ 
       Document doc = null; 
       DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
       try { 

        DocumentBuilder db = dbf.newDocumentBuilder(); 
        doc = db.parse(new InputSource(new StringReader(xml))); 
        doc.normalize(); 
        //InputSource is = new InputSource(); 
        //  is.setCharacterStream(new StringReader(xml)); 
         // doc = db.parse(is); 

        } catch (ParserConfigurationException e) { 
         Log.e("Error: ", e.getMessage()); 
         return null; 
        } catch (SAXException e) { 
         Log.e("Error: ", e.getMessage()); 
         return null; 
        } catch (IOException e) { 
         Log.e("Error: ", e.getMessage()); 
         return null; 
        } 

        return doc; 
      } 


    public final String getElementValue(Node elem) { 
       Node child; 
       if (elem != null) { 
        if (elem.hasChildNodes()) { 
         for (child = elem.getFirstChild(); child != null; child = child 
           .getNextSibling()) { 
          if (child.getNodeType() == Node.TEXT_NODE || child.getNodeType() == Node.CDATA_SECTION_NODE) { 
           return child.getTextContent(); 
          } 
         } 
        } 
       } 
       return ""; 
      }

答

// All static variables 
    static final String URL = "http://www.google.co.in/ig/api?news&hl=en"; 
    // XML node keys 
    static final String KEY_ITEM = "news"; // parent node 
    static final String KEY_ID = "news_entry"; 
    static final String KEY_NAME = "title"; 
    static final String KEY_COST = "url"; 
    static final String KEY_DESC = "snippet"; 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 


     ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); 

     XMLParser parser = new XMLParser(); 
     String xml = parser.getXmlFromUrl(URL); // getting XML 
     Document doc = parser.getDomElement(xml); // getting DOM element 

     NodeList nl = doc.getElementsByTagName(KEY_ITEM); 

     for (int i = 0; i < nl.getLength(); i++) { 

      HashMap<String, String> map = new HashMap<String, String>(); 
      Element e = (Element) nl.item(i); 
      NamedNodeMap attributes = e.getAttributes(); 
      System.out.println("attrlength"+attributes.getLength()); 
      for (int a = 0; a < attributes.getLength(); a++) 
      { 
        Node theAttribute = attributes.item(a); 
        System.out.println(theAttribute.getNodeName() + "=" + theAttribute.getNodeValue()); 
      } 

      NodeList nl1=e.getElementsByTagName(KEY_ID); 
      System.out.println("keyId"+nl1.getLength()); 
      for(int j=0;j<nl1.getLength();j++) 
      { 
       Element e1 = (Element) nl1.item(j); 

       NodeList n = e1.getElementsByTagName(KEY_NAME); 

        for (int k = 0; k < n.getLength(); k++) { 

         Element e2 = (Element) n.item(k); 
       // System.out.println("node Title value"+e2.getNodeName()); 
        NamedNodeMap attributes2 = e2.getAttributes(); 
        // System.out.println("attrlength"+attributes2.getLength()); 
        for (int a = 0; a < attributes2.getLength(); a++) 
        { 
          Node theAttribute = attributes2.item(a); 
          System.out.println(theAttribute.getNodeName() + "=" + theAttribute.getNodeValue()); 

        } 
        } 

        NodeList n1 = e1.getElementsByTagName(KEY_COST); 
       // System.out.println("title "+n.getLength()); 
        for (int k = 0; k < n1.getLength(); k++) { 

         Element e2 = (Element) n1.item(k); 
       // System.out.println("node Url value"); 
        NamedNodeMap attributes2 = e2.getAttributes(); 
        // System.out.println("attrlength"+attributes2.getLength()); 
        for (int a = 0; a < attributes2.getLength(); a++) 
        { 
          Node theAttribute = attributes2.item(a); 
          System.out.println(theAttribute.getNodeName() + "=" + theAttribute.getNodeValue()); 

        }} 

        NodeList n2 = e1.getElementsByTagName(KEY_DESC); 
        // System.out.println("title "+n.getLength()); 
         for (int k = 0; k < n2.getLength(); k++) { 

          Element e2 = (Element) n2.item(k); 
        // System.out.println("node snippet value"+e2.getNodeName()); 
         NamedNodeMap attributes2 = e2.getAttributes(); 
         // System.out.println("attrlength"+attributes2.getLength()); 
         for (int a = 0; a < attributes2.getLength(); a++) 
         { 
           Node theAttribute = attributes2.item(a); 
           System.out.println(theAttribute.getNodeName() + "=" + theAttribute.getNodeValue()); 

         } 
         } 

      } 



      menuItems.add(map); 
     } 

    }

我编辑了我的答案。它有完整的URL，标题，片段的解析代码。 – mukesh

请从代码中的keyname，keycost字符串声明中删除空格。 – mukesh

请检查它。 – mukesh

使用DOM解析器进行xml解析

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