android、sax解析xml

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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;

import cn.itcast.domain.Person;
/**
* 采用SAX完成对XML内容的解析
*
*/
public class SAXPersonService {
/**
* 获取人员
* @param xmlStream xml数据
* @return 人员信息
* @throws Exception
*/
public List<Person> getPersons(InputStream xmlStream) throws Exception{
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
PersonHandler handler = new PersonHandler();
parser.parse(xmlStream, handler);
return handler.getPersons();
}

private class PersonHandler extends DefaultHandler{
private List<Person> persons = null;
private String preTag = null;
private Person person = null;

public List<Person> getPersons() {
return persons;
}

@Override
public void startDocument() throws SAXException {
persons = new ArrayList<Person>();
}

@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if("person".equals(localName)){
person = new Person();
person.setId(new Integer(attributes.getValue(0)));
}
preTag = localName;
}

@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if(preTag!=null){
String data = new String(ch, start, length);
if("name".equals(preTag)){
person.setName(data);
}else if("age".equals(preTag)){
person.setAge(new Short(data));
}
}
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if("person".equals(localName)){
persons.add(person);
person = null;
}
preTag = null;
}
}
}

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