android、pull解析xml

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

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;

import android.util.Xml;

import cn.itcast.domain.Person;
/**
* 采用Pull解析器完成XML内容的解析
*/
public class PullPersonService {
/**
* 生成XML内容
* @param outStream xml内容的输出方向
* @param persons
* @throws Exception
*/
public static void save(OutputStream outStream, List<Person> persons) throws Exception{
XmlSerializer serializer = Xml.newSerializer();
serializer.setOutput(outStream, "UTF-8");
serializer.startDocument("UTF-8", true);
serializer.startTag(null, "persons");
for(Person person : persons){
serializer.startTag(null, "person");
serializer.attribute(null, "id", person.getId().toString());

serializer.startTag(null, "name");
serializer.text(person.getName());
serializer.endTag(null, "name");

serializer.startTag(null, "age");
serializer.text(person.getAge().toString());
serializer.endTag(null, "age");

serializer.endTag(null, "person");
}
serializer.endTag(null, "persons");
serializer.endDocument();
outStream.flush();
outStream.close();
}

public static List<Person> getPersons(InputStream inputStream) throws Exception{
List<Person> persons = null;
Person person = null;
XmlPullParser parser = Xml.newPullParser();
parser.setInput(inputStream, "UTF-8");
int event = parser.getEventType();//产生第一个事件
while(event!=XmlPullParser.END_DOCUMENT){
switch (event) {
case XmlPullParser.START_DOCUMENT:
persons = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
if("person".equals(parser.getName())){
person = new Person();
person.setId(new Integer(parser.getAttributeValue(0)));
}
if(person!=null){
if("name".equals(parser.getName())){
person.setName(parser.nextText());
}else if("age".equals(parser.getName())){
person.setAge(new Short(parser.nextText()));
}
}
break;
case XmlPullParser.END_TAG:
if("person".equals(parser.getName())){
persons.add(person);
person = null;
}
break;
}
event = parser.next();//进入下一个元素并触发相应事件
}
return persons;
}
}