如何用 SAX 解析 rss-feed，其他解析方法？

Question

我正在尝试解析多个属性但没有成功。

这些属性我解析得很好：

<id>..</id>
<published>..</published>
<content>..</content>
<title>..</title>

我解析的 xml 图像和我需要的数据： 但我需要用标签获取属性：

<media:thumbnail url='http://ww.../> </media:thumbnail>
<media:content url='http://ww.../> </<media:content>

我在某处读到 sax 解析不支持这样做，我当时不明白这是真的。

我使用代码是为了执行解析：

public class YoutubePARSER {
    private static final String LOGTAG = "LogsAndroid";
    private ArrayList<YoutubeVO> videos = new ArrayList<YoutubeVO>();
    private YoutubeVO video;
    private URL rssUrl;
    final String myString = "http://www.w3.org/2005/Atom";

    SAXParserFactory parser = SAXParserFactory.newInstance(); 

public YoutubePARSER(String url)
{
    try
    {
        this.rssUrl = new URL(url);
    }
    catch (MalformedURLException e)
    {
        throw new RuntimeException(e);
    } 
}

public ArrayList<YoutubeVO> parse()
{
    RootElement root = new RootElement(myString, "feed");
          Element itemPlace = root.getChild(myString, "entry");
          itemPlace.setStartElementListener(new StartElementListener(){
              public void start(Attributes attrs){
                  video = new YoutubeVO();  
              }
          });

      itemPlace.setEndElementListener(new EndElementListener(){
            public void end() {
                videos.add(video);
            }
        });

      itemPlace.getChild(myString, "id").setEndTextElementListener(
              new EndTextElementListener(){
                  public void end(String body) {
                      video.setId(body);
                  }
          });

      itemPlace.getChild(myString, "published").setEndTextElementListener(
    new EndTextElementListener(){
        public void end(String body) {
            video.setPublished(body);
        }
});

我尝试通过以下方式解析该字段，但没有成功：

 itemPlace.getChild(myString, "media:thumbnail").setEndTextElementListener(
 itemPlace.getChild(myString, "media").setEndTextElementListener(
 itemPlace.getChild(myString, "thumbnail").setEndTextElementListener(
 itemPlace.getChild(myString, "media:thumbnail url").setEndTextElementListener(

有什么办法吗？？

谢谢！

Answer 1

为了能够读取“media:content”或任何其他“media:”元素，您需要指定媒体Namespace .

您在代码中设置了错误的名称空间并使用了 myString="http://www.w3.org/2005/Atom"

itemPlace.getChild(myString, "thumbnail").setEndTextElementListener(

将其更改为正确的命名空间会很有效：

itemPlace.getChild("http://search.yahoo.com/mrss/", "thumbnail")setElementListener(new ElementListener() {
        @Override
        public void end() {

        }

        @Override
        public void start(Attributes attributes) {
            String urlAttr = attributes.getValue("url");
        }
    });

注意：您无需指定命名空间前缀，只需使用元素名称（在本例中为缩略图）。

Answer 2

我的解决方案：

public class DomParserSampleActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ScrollView mScrView1 = new ScrollView(this);

        /** Create a new layout to display the view */
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(1);

        /** Create a new textview array to display the results */
        TextView id[];
        TextView published[];
        TextView content[];
        TextView title[];

        TextView mediacontent[];
        TextView mediathumbnail[];

        try {
            URL url = new URL(
                    "http://gdata.youtube.com/feeds/api/users/estudiosabiertostv/uploads");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(url.openStream()));
            doc.getDocumentElement().normalize();

            NodeList nodeList = doc.getElementsByTagName("entry");

            /** Assign textview array length by arraylist size */
            id = new TextView[nodeList.getLength()];
            published = new TextView[nodeList.getLength()];
            content = new TextView[nodeList.getLength()];
            title = new TextView[nodeList.getLength()];
            mediacontent = new TextView[nodeList.getLength()];
            mediathumbnail = new TextView[nodeList.getLength()];

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

                Node node = nodeList.item(i);

                id[i] = new TextView(this);
                published[i] = new TextView(this);
                content[i] = new TextView(this);
                title[i] = new TextView(this);

                Element fstElmnt = (Element) node;

                NodeList idList = fstElmnt.getElementsByTagName("id");
                Element idElement = (Element) idList.item(0);
                idList = idElement.getChildNodes();
                id[i].setText("Id is = "
                        + ((Node) idList.item(0)).getNodeValue());

                Log.v("TAG","id: "+idList.item(0).getNodeValue());

                NodeList publishedList = fstElmnt
                        .getElementsByTagName("published");
                Element publishedElement = (Element) publishedList.item(0);
                publishedList = publishedElement.getChildNodes();
                published[i].setText("published is = "
                        + ((Node) publishedList.item(0)).getNodeValue());

                Log.v("TAG","published: "+publishedList.item(0).getNodeValue());

                NodeList contentList = fstElmnt.getElementsByTagName("content");
                Element contentElement = (Element) contentList.item(0);
                contentList = contentElement.getChildNodes();
                content[i].setText("content is = "
                        + ((Node) contentList.item(0)).getNodeValue());

                Log.v("TAG","content: "+contentList.item(0).getNodeValue());

                NodeList titleList = fstElmnt.getElementsByTagName("title");
                Element titleElement = (Element) titleList.item(0);
                titleList = titleElement.getChildNodes();
                title[i].setText("title is = "
                        + ((Node) titleList.item(0)).getNodeValue());

                Log.v("TAG","titulo: "+titleList.item(0).getNodeValue());

                NodeList nodeList1 = fstElmnt
                        .getElementsByTagName("media:group");

                for (int j = 0; j < nodeList1.getLength(); j++) {
                    Node node1 = nodeList1.item(j);
                    mediacontent[j] = new TextView(this);
                    mediathumbnail[j] = new TextView(this);

                    Element secondElmnt = (Element) node1;

                    NodeList mediacontentList = secondElmnt
                            .getElementsByTagName("media:content");
                    Element mediacontentElement = (Element) mediacontentList
                            .item(0);
                    mediacontent[j].setText("mediacontent url is = "
                            + mediacontentElement.getAttribute("url"));

                    Log.v("TAG","MEDIACONTENT: "+mediacontentElement.getAttribute("url"));

                    NodeList mediathumbnailList = secondElmnt
                            .getElementsByTagName("media:thumbnail");
                    Element mediathumbnailElement = (Element) mediathumbnailList
                            .item(0);
                    mediathumbnail[j].setText("mediathumbnail url is = "
                            + mediathumbnailElement.getAttribute("url"));

                    Log.v("TAG","MEDIATHUMBNAIL: "+mediathumbnailElement.getAttribute("url"));

                    layout.addView(mediacontent[j]);
                    layout.addView(mediathumbnail[j]);
                }

                layout.addView(id[i]);
                layout.addView(published[i]);
                layout.addView(content[i]);
                layout.addView(title[i]);

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        /** Set the layout view to display */

        mScrView1.addView(layout);
        setContentView(mScrView1);
    }
}

不要忘记在线程中这样做或失败，请使用这些行 在 onCreate() 之后

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
    StrictMode.setThreadPolicy(policy);