Android采用PULL解析XML文档

Android系统中采用PULL技术解析XML文档比用SAX技术性能要好得多。建议Android的开发者采用PULL技术解析XML文档。跟SAX类似，只不过PULL技术返回的事件类型是整型，所以我们只要对返回的事件进行处理就行了。

 

package com.cn.service;

import java.io.IOException;
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 com.cn.domain.Persion;
/****
 * 采用Pull解析XML
 * 
 * ****/
public class PULLPersionService {

	public static List<Persion> getPersino(InputStream is)throws Exception{
		List<Persion> list = null;
		Persion persion = null;
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(is, "UTF-8");
		int event = parser.getEventType();
		while(event != XmlPullParser.END_DOCUMENT){
			switch (event){
			case XmlPullParser.START_DOCUMENT:
				list =  new ArrayList<Persion>();
				break;
			case XmlPullParser.START_TAG:
				if("person".equals(parser.getName())){//得到指针所指向的节点名称
					int id = Integer.parseInt(parser.getAttributeValue(0));
					persion = new Persion();
					persion.setId(id);
				}
				if(persion != null){
					if("name".equals(parser.getName())){
						String name = parser.nextText();
						persion.setName(name);
					}else if("age".equals(parser.getName())){
						String age = parser.nextText();
						persion.setName(age);
					}
				}
				break;
			case XmlPullParser.END_TAG:
				if("person".equals(parser.getName())){
					list.add(persion);
					persion = null;
				}
				break;
			default:
				break;
			}
		}
		event = parser.next();
		return list;
	}
	
	public static void save(List<Persion> list,OutputStream os) throws IllegalArgumentException, IllegalStateException, IOException{
		XmlSerializer serializer = Xml.newSerializer();
		serializer.setOutput(os, "UTF-8");
		serializer.startDocument("UTF-8", true);
		serializer.startTag(null, "persons");
		for(Persion persion : list){
			serializer.startTag(null, "person");
			serializer.attribute(null, "id", String.valueOf(persion.getId()));
				serializer.startTag(null, "name");
				serializer.text(persion.getName());
				serializer.endTag(null, "name");
				
				serializer.startTag(null, "age");
				serializer.text(String.valueOf(persion.getAge()));
				serializer.endTag(null, "age");
			serializer.endTag(null, "person");
		}
		serializer.endTag(null, "persons");
		serializer.endDocument();
		os.flush();
		os.close();
	}
}