/********************************************************************** 這個類的作用就是打印出XML文檔中元素以及屬性的名稱空間名**********************************************************************/package tsinghuaip;import org.xml.sax.XMLReader;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import javax.xml.parsers.SAXParserFactory;import javax.xml.parsers.SAXParser;public class NameSpace extends DefaultHandler{    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException{        print("Elem: " + qName, uri, localName );        System.out.println("here1");        for (int i = 0; i < atts.getLength(); i++){            print("Attr: " + atts.getQName(i) + "=" + atts.getValue(i),                  atts.getURI(i),                  atts.getLocalName(i));        }    }    public void characters(char ch[], int start, int length) throws SAXException{        String strData = new String(ch, start, length).trim();        if (strData.length() > 0){            System.out.println("Characters"+strData);        }    }    public void print(String t, String u, String l){        System.out.println(t);        System.out.println("URI: " + u);        System.out.println("Local name: " + l);    }    public static void main(String[] args) throws Exception{        SAXParserFactory spf = SAXParserFactory.newInstance();        spf.setNamespaceAware(true);        XMLReader reader = spf.newSAXParser().getXMLReader();        reader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);        reader.setContentHandler(new NameSpace());        reader.parse("TsinghuaIPAssign.xml");    }}