[JAVA100例]069、使用SAX解析XML

ReadxmlDemo.java

import java.io.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

public class ReadXmlDemo extends DefaultHandler {

    public static void main(String[] arguments) {
        if (arguments.length > 0){
     ReadXmlDemo read = new ReadXmlDemo(arguments[0]);
 } else {
     System.out.PRintln("Usage: java ReadXmlDemo filename");
 }
    }

    ReadXmlDemo(String xmlFile) {
        File input = new File(xmlFile);
 SAXParserFactory factory = SAXParserFactory.newInstance();
 factory.setValidating(true);
 try {
     SAXParser sax = factory.newSAXParser();
     sax.parse(input, new XmlHandler() );
 } catch (ParserConfigurationException pce) {
     System.out.println("Could not create that parser.");
     System.out.println(pce.getMessage());
 } catch (SAXException saxe) {
     System.out.println("Problem with the SAX parser.");
     System.out.println(saxe.getMessage());
 } catch (IOException ioe) {
     System.out.println("Error reading file.");
     System.out.println(ioe.getMessage());
 }
    }
}

class XmlHandler extends DefaultHandler {
    static int READING_NAME = 1;
    static int READING_SEX = 2;
    static int READING_BIRTH = 3;
    static int READING_NOTHING = 0;
    int currentActivity = READING_NOTHING;
    ReadXml xml = new ReadXml();

    XmlHandler() {
        super();
    }

    public void startElement(String uri, String localName, String qName, Attributes attributes) {
   
        if (qName.equals("title"))
            currentActivity = READING_NAME;
 else if (qName.equals("file"))
     currentActivity = READING_SEX;
 //else if (qName.equals("Birth"))
     //currentActivity = READING_BIRTH;
    }

    public void characters(char[] ch, int start, int length) {
        String value = new String(ch, start, length);
 if (currentActivity == READING_NAME)
     xml.name = value;
 if (currentActivity == READING_SEX)
     xml.sex = value;
 //if (currentActivity == READING_BIRTH)
     //xml.birth = value;
    }