Android Pull方式解析XML

除了可以使用 SAX和DOM解析XML文件，大家也可以使用Android内置的Pull解析器解析XML文件。 Pull解析器的运行方式与 SAX 解析器相似。它提供了类似的事件，如：开始元素和结束元素事件，使用parser.next()可以进入下一个元素并触发相应事件。事件将作为数值代码被发送，因此可以使用一个switch对感兴趣的事件进行处理。当元素开始解析时，调用parser.nextText()方法可以获取下一个Text类型元素的值。

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package com.gao.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 android.util.Xml;
import com.gao.domain.Person;
public class PullPersonService {
	public static void writeXML(List<Person> personList,Writer writer)throws Exception {
		XmlSerializer serializer=Xml.newSerializer();
		serializer.setOutput(writer);
		serializer.startDocument("UTF-8", true);
		serializer.startTag(null, "persons");
		for (Person person : personList){
			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");
	}
	
	
	public static List<Person> readXML(InputStream inputStream)
			throws Exception {
		List<Person> personList = null;
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(inputStream, "UTF-8");
		int eventCode = parser.getEventType();
		Person person = null;
		while (eventCode != XmlPullParser.END_DOCUMENT) {
			switch (eventCode) {
			case XmlPullParser.START_DOCUMENT:
				personList = new ArrayList<Person>();
				break;
			case XmlPullParser.START_TAG:
				if ("person".equals(parser.getName())) {
					person = new Person();
					person.setId(new Integer(parser.getAttributeValue(0)));
				} else if (person != null) {
					if ("name".equals(parser.getName())) {
						person.setName(parser.nextText());
					} else if ("age".equals(parser.getName())) {
						person.setAge(new Integer(parser.nextText()));
					}
				}
				break;
			case XmlPullParser.END_TAG:
				if ("person".equals(parser.getName()) && person != null) {
					personList.add(person);
				}
			default:
				break;
			}
			eventCode = parser.next();
		}
		return personList;
	}
}

测试：

public void testReadPullXML() throws Exception {
		InputStream inputStream=XMLPersonServiceTest.class.getClassLoader().getResourceAsStream("gao.xml");
		List<Person> persons=PullPersonService.readXML(inputStream);
		for (Person person : persons) {
			Log.i(TAG, person.toString());
		}
	}
	
	public void testWritePullXML() throws Exception {
		FileOutputStream fileOutputStream=this.getContext().openFileOutput("person.xml", Context.MODE_WORLD_READABLE);
		OutputStreamWriter writer=new OutputStreamWriter(fileOutputStream, "UTF-8");
		BufferedWriter bufferedWriter=new BufferedWriter(writer);
		List<Person> personList=new ArrayList<Person>();
		personList.add(new Person(12,"Gao",34));
		personList.add(new Person(34,"高",23));
		personList.add(new Person(34,"GaoMatrix",34));
		PullPersonService.writeXML(personList, bufferedWriter);
		
		/*StringWriter writer=new StringWriter();
		List<Person> personList=new ArrayList<Person>();
		personList.add(new Person(12,"Gao",34));
		personList.add(new Person(34,"高",23));
		personList.add(new Person(34,"GaoMatrix",34));
		PullPersonService.writeXML(personList, writer);
		Log.i(TAG, writer.toString());*/
	}