[JAVA100例]069、使用SAX解析XML

核心提示：ReadxmlDemo.javaimport java.io.*;import javax.xml.parsers.*;import org.xml.sax.*;import org.xml.sax.helpers.*;public class ReadXmlDemo extends DefaultHandler {

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;
　  }