Android中使用PULL方式解析XML和XmlSerializer进行序列化

XML解析方式一般有DOM解析，SAX解析，而Android中推荐的解析方式是PULL解析，以下是最近写的一个Demo中的关键代码。

import java.io.File;import java.io.FileOutputStream;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.os.Environment;import android.util.Xml;public class PersonXmlPullParserAndXmlSerializer {public ArrayList<Person> XmlPullParserTest() throws Exception {//创建一个InputStream通过反射得到当前累的对象然后getClassLoader().getResourceAsStream();InputStream is = PersonXmlPullParserAndXmlSerializer.class.getClassLoader().getResourceAsStream("persons.xml");//Xml.newPullParser()得到一个XmlPullParserXmlPullParser xpp = Xml.newPullParser();//设置要解析的目标和读取的编码xpp.setInput(is, "UTF-8");ArrayList<Person> listPerson = new ArrayList<Person>();Person p = null;for (int i = xpp.getEventType(); i != XmlPullParser.END_DOCUMENT; i = xpp.next()) {switch (i) {case XmlPullParser.START_TAG:if (xpp.getName() == "person") {String str = xpp.getAttributeValue(0);p = new Person();p.setId(Integer.parseInt(str));} else if (xpp.getName().equals("name")) {p.setName(xpp.nextText());} else if (xpp.getName().equals("age")) {p.setAge(Integer.parseInt(xpp.nextText()));}break;case XmlPullParser.END_TAG://遍历Xml文件中一个对象，直到解析到这个对象的if (xpp.getName().equals("person")) {listPerson.add(p);}break;}}return listPerson;}public void XmlSerializerTest(List<Person> persons) throws Exception {OutputStream os = new FileOutputStream(new File(Environment.getExternalStorageDirectory(), "persons.xml"));XmlSerializer serializer = Xml.newSerializer();serializer.setOutput(os, "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.endDocument();}}

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