XML parsen

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
 
import javax.xml.parsers.ParserConfigurationException;
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 XMLDemo {
	ArrayList<Address> addresses = new ArrayList<>();
 
	public XMLDemo() {
		String xml = "<addresses>"
					  +    "<address>"
					  +       "<name>Hugo</name>"
					  +       "<age>42</age>"
					  +    "</address>"
					  +    "<address>"
					  +       "<name>Trude</name>"
					  +       "<age>38</age>"
					  +    "</address>"
					  + "</addresses>";
		InputStream is = new ByteArrayInputStream(xml.getBytes());
		try {
			MyXMLParser parser = new MyXMLParser(is, addresses);
			parser.parse();
 
			for (Address address : addresses) {
				System.out.println(address);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
	public static void main(String[] args) {
		new XMLDemo();
	}
}
 
class MyXMLHandler extends DefaultHandler {
	StringBuffer		 sb		= new StringBuffer();
	Address 				 address;
	ArrayList<Address> addresses;
 
	public MyXMLHandler(ArrayList<Address> addresses){
		this.addresses = addresses;
	}
 
	@Override
	public void startElement(String uri, String localName, String qName, Attributes attributes)
			throws SAXException {
		super.startElement(uri, localName, qName, attributes);
		sb = new StringBuffer();
		if (qName.equalsIgnoreCase("address"))
			address = new Address();
	}
 
	@Override
	public void characters(char[] ch, int start, int length) throws SAXException {
		super.characters(ch, start, length);
		sb.append(ch, start, length);
	}
 
	@Override
	public void endElement(String uri, String localName, String name) throws SAXException {
		super.endElement(uri, localName, name);
		if (name.equalsIgnoreCase("name"))
			address.setName(sb.toString());
		else
			if (name.equalsIgnoreCase("age"))
				address.setAge(Integer.parseInt(sb.toString()));
			else
				if (name.equalsIgnoreCase("address")){
					addresses.add(address);
				}
	}
}
 
 
class MyXMLParser {
	InputStream	is;
	SAXParser			 saxParser;
	ArrayList<Address> addresses;
 
	public MyXMLParser(InputStream is, ArrayList<Address> addresses) throws ParserConfigurationException, SAXException {
		this.is = is;
		this.addresses = addresses;
		SAXParserFactory factory = SAXParserFactory.newInstance();
		saxParser = factory.newSAXParser();
	}
 
	public void parse() throws SAXException, IOException {
		MyXMLHandler handler = new MyXMLHandler(addresses);
		saxParser.parse(is, handler);
	}
}
 
 
class Address {
   private String name;
   private int age;
 
   public String getName(){
	return name;
   }
   public void setName(String name){
	this.name = name;
   }
   public int getAge(){
	return age;
   }
   public void setAge(int age){
	this.age = age;
   }
 
   @Override
   public String toString() {
	return name + ", " + age;
   }
}

Stichworte:

XML parsen lesen