/**********************************************************************
 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 );

        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){
            try{
                System.out.println("Characters" +
                                   new String(strData.getBytes("ISO-8859-1")));
            }
            catch(Exception e){
            e.printStackTrace();
        }
        }

    }

    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");
    }
}