Pull解析和生成XML

1.解析

Pull解析器只有一个重要的方法next()，它的事件也只有5个（START_DOCUMENT，START_TAG，TEXT，END_TAG，END_DOCUMENT）解析方法类似于SAX。

代码如下：

public class PullPersonService {
public static List<Person> getPersons(InputStream inputStream) throws Exception{
Person person = null;
List<Person> list = null;

XmlPullParser pullParser = Xml.newPullParser();
pullParser.setInput(inputStream, "UTF-8");
int event = pullParser.getEventType();//触发第一个事件
while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
list = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
if("person".equals(pullParser.getName())){
int id = Integer.valueOf(pullParser.getAttributeValue(0));
person = new Person();
person.setId(id);
}
if(person != null){
if("name".equals(pullParser.getName())){
person.setName(pullParser.nextText());
}
if("age".equals(pullParser.getName())){
person.setAge(new Short(pullParser.nextText()));
Log.i("TAG", person.toString());
}
}
break;
case XmlPullParser.END_TAG:
if("person".equals(pullParser.getName())){
list.add(person);
person = null;
}
break;
}
event = pullParser.next();
}
return list;
}
}

2.生成

public static void save(List<Person> list, OutputStream outputStream)
throws Exception{
XmlSerializer serializer = Xml.newSerializer();//对象序列化
serializer.setOutput(outputStream, "UTF-8");
serializer.startDocument("UTF-8", true);
serializer.startTag(null, "persons");
for (Person person : list) {
serializer.startTag(null, "person");
serializer.attribute(null, "id", String.valueOf(person.getId()));

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

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

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