pull解析和生成xml

package com.ljq.service;

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

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

import com.ljq.entity.Person;

import android.util.Xml;

/**
* Pull解析xml文件
*
* @author jiqinlin
*
*/
public class PullPersonService {

/**
 * 使用pull解析器生成xml文件
 * 
 * @param persons
 * @param writer
 * @return
 */
public static String writeXML(List<Person> persons, Writer writer){
    XmlSerializer serializer = Xml.newSerializer();
    try {
        serializer.setOutput(writer);
        serializer.startDocument("UTF-8", true);
        //第一个参数为命名空间,如果不使用命名空间,可以设置为null
        serializer.startTag("", "persons");
        for (Person person : persons){
            serializer.startTag("", "person");
            serializer.attribute("", "id", person.getId().toString());
            serializer.startTag("", "name");
            serializer.text(person.getName());
            serializer.endTag("", "name");
            serializer.startTag("", "age");
            serializer.text(person.getAge().toString());
            serializer.endTag("", "age");
            serializer.endTag("", "person");
        }
        serializer.endTag("", "persons");
        serializer.endDocument();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return writer.toString();
}

/**
 * 使用pull解析器解析xml文件
 * 
 * @param inStream
 * @return
 * @throws Exception
 */
public static List<Person> readXML(InputStream inStream) throws Exception {
    XmlPullParser parser = Xml.newPullParser();
    parser.setInput(inStream, "UTF-8");
    int eventType = parser.getEventType();
    Person currentPerson = null;
    List<Person> persons = null;
    while (eventType != XmlPullParser.END_DOCUMENT) {
        switch (eventType) {
        case XmlPullParser.START_DOCUMENT:// 文档开始事件,可以进行数据初始化处理
            persons = new ArrayList<Person>();
            break;
        case XmlPullParser.START_TAG:// 开始元素事件
            String name = parser.getName();
            if (name.equalsIgnoreCase("person")) {
                currentPerson = new Person();
                currentPerson.setId(new Integer(parser.getAttributeValue(null, "id")));
            } else if (currentPerson != null) {
                if (name.equalsIgnoreCase("name")) {
                    currentPerson.setName(parser.nextText());// 如果后面是Text元素,即返回它的值
                } else if (name.equalsIgnoreCase("age")) {
                    currentPerson.setAge(new Short(parser.nextText()));
                }
            }
            break;
        case XmlPullParser.END_TAG:// 结束元素事件
            if (parser.getName().equalsIgnoreCase("person")&& currentPerson != null) {
                persons.add(currentPerson);
                currentPerson = null;
            }
            break;
        }
        eventType = parser.next();
    }
    inStream.close();
    return persons;
}

}