xml解析

1.使用dom解析

public static void main(String args[])
{
String xmls="<?xml version=\"1.0\" encoding=\"gb2312\"?><root><![CDATA[嘉庆年间]]></root>";
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db; 
Document doc; 

try {
db = dbf.newDocumentBuilder(); 
InputStream x=new ByteArrayInputStream(xmls.getBytes());;
doc = db.parse(x);
Element root=doc.getDocumentElement();
System.out.print(root.getFirstChild().getNodeValue()); 
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}
2.使用xmlpullparser
public class RssParser {


        private int currentstate = -1;

        private boolean isItemTAG = false;


        private RssItem rssItem;

        private RssFeed rssFeed;


        final int TITLE = 1;

        final int LINK = 2;

        final int DESCRIPTION = 3;

        final int PUBDATE = 4;

        public void ParserRss(String url) throws Exception {


                XmlPullParserFactory xmlPullParserFactory = XmlPullParserFactory.newInstance();

                xmlPullParserFactory.setNamespaceAware(true);

                XmlPullParser xmlPullParser = xmlPullParserFactory.newPullParser();

                URL urlAddress = new URL(url);

                xmlPullParser.setInput(urlAddress.openStream(), "gbk");

                int eventType = xmlPullParser.getEventType();

                while (eventType != xmlPullParser.END_DOCUMENT) {

                        if (eventType == xmlPullParser.START_DOCUMENT) {

                                System.out.println("start Document...");

                                rssFeed = new RssFeed();

                        } else if (eventType == xmlPullParser.END_DOCUMENT) {

                                System.out.println("end Document...");

                        } else if (eventType == xmlPullParser.START_TAG) {

                                if (xmlPullParser.getName().equals("item")) {

                                        rssItem = new RssItem();

                                        isItemTAG = true;

                                }

                                if (xmlPullParser.getName().equals("title")) {

                                        currentstate = TITLE;

                                }

                                if (xmlPullParser.getName().equals("link")) {

                                        currentstate = LINK;

                                }

                                if (xmlPullParser.getName().equals("description")) {

                                        currentstate = DESCRIPTION;

                                }

                                if (xmlPullParser.getName().equals("pubDate")) {

                                        currentstate = PUBDATE;

                                }

                        } else if (eventType == xmlPullParser.END_TAG) {

                                if (xmlPullParser.getName().equals("item")) {

                                        rssFeed.addItem(rssItem);

                                }


                        } else if (eventType == xmlPullParser.TEXT) {

                                if (isItemTAG) {

                                        switch (currentstate) {

                                        case TITLE:

                                                rssItem.setTitle(clearSpecialChar(xmlPullParser.getText()));

                                                currentstate = -1;

                                                break;

                                        case LINK:

                                                rssItem.setLink(clearSpecialChar(xmlPullParser.getText()));

                                                currentstate = -1;

                                                break;

                                        case DESCRIPTION:

                                                rssItem.setDescription(clearSpecialChar(xmlPullParser.getText()));

                                                currentstate = -1;

                                                break;

                                        case PUBDATE:

                                                rssItem.setPubData(clearSpecialChar(xmlPullParser.getText()));

                                                currentstate = -1;

                                                break;

                                        default:

                                                break;

                                        }

                                }

                        }


                        eventType = xmlPullParser.next();

                }

        }
       

        public RssFeed getFeed(){

                return rssFeed;

        }

       

        private String clearSpecialChar(String s){

                Pattern pattern = Pattern.compile("\\s|\\r|\\n|\\t");

                Matcher matcher = pattern.matcher(s);

                return matcher.replaceAll("").trim();

        }

}