saxcounter.java

写xml文件的相关类,可以直接应用到项目

package xmlwriter;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SAXCounter extends DefaultHandler {
    private Hashtable tags;

    // Parser calls this once at the beginning of a document
    public void startDocument() throws SAXException {
        tags = new Hashtable();
    }

    public void endDocument() throws SAXException {
        Enumeration e = tags.keys();
        while (e.hasMoreElements()) {
            String tag = (String)e.nextElement();
            int count = ((Integer)tags.get(tag)).intValue();
            System.out.println("Tag <" + tag + "> occurs " + count
                               + " times");
        }
    }

        // Parser calls this for each element in a document
    public void startElement(String namespaceURI, String localName,
                             String rawName, Attributes atts)
	throws SAXException
    {
        String key = localName;
        Object value = tags.get(key);
        if (value == null) {
            // Add a new entry
            tags.put(key, new Integer(1));
        } else {
            // Get the current count and increment it
            int count = ((Integer)value).intValue();
            count++;
            tags.put(key, new Integer(count));
        }
    }

        static public void main(String[] args) {
        String filename = null;
        boolean validation = false;
        filename="links.xml";
        SAXParserFactory spf = SAXParserFactory.newInstance();
//        XMLReader xmlReader = null;
        SAXParser saxParser=null;
        try {
            // Create a JAXP SAXParser
            saxParser = spf.newSAXParser();
            // Get the encapsulated SAX XMLReader
            //xmlReader = saxParser.getXMLReader();
        } catch (Exception ex) {
            System.err.println(ex);
            System.exit(1);
        }


        try {

            saxParser.parse(new File(filename),new SAXCounter());
        } catch (SAXException se) {
            System.err.println(se.getMessage());
            System.exit(1);
        } catch (IOException ioe) {
            System.err.println(ioe);
            System.exit(1);
        }
    }

}