Android Pull解析xml

阅读更多

在Android平台上可以使用Simple API for XML(SAX) 、 Document Object Model(DOM)和Android附带的pull解析器解析XML文件。

xml代码

	
		李明
		30
	
	
		李向梅
		25
	

解析核心代码

package cn.itcast.service;

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 cn.itcast.domain.Person;

public class PersonService {
	/**
	 * 获取数据
	 * @param xml
	 * @return
	 * @throws Exception
	 */
	public static List getPersons(InputStream xml) throws Exception{
		List persons = null;
		Person person = null;
		XmlPullParser pullParser = Xml.newPullParser();
		pullParser.setInput(xml, "UTF-8");//为Pull解析器设置要解析的XML数据
		int event = pullParser.getEventType();
		while(event != XmlPullParser.END_DOCUMENT){
			switch (event) {
			case XmlPullParser.START_DOCUMENT:
				persons = new ArrayList();
				break;
				
			case XmlPullParser.START_TAG:
				if("person".equals(pullParser.getName())){
					int id = new Integer(pullParser.getAttributeValue(0));
					person = new Person();
					person.setId(id);
				}
				if("name".equals(pullParser.getName())){
					String name = pullParser.nextText();
					person.setName(name);
				}
				if("age".equals(pullParser.getName())){
					int age = new Integer(pullParser.nextText());
					person.setAge(age);
				}
				break;
				
			case XmlPullParser.END_TAG:
				if("person".equals(pullParser.getName())){
					persons.add(person);
					person = null;
				}
				break;
			}
			event = pullParser.next();
		}
		return persons;
	}
	/**
	 * 保存数据
	 * @param persons 数据
	 * @param out 输出方向
	 * @throws Exception
	 */
	public static void save(List persons, OutputStream out) throws Exception{
		XmlSerializer serializer = Xml.newSerializer();
		serializer.setOutput(out, "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.endTag(null, "persons");
		serializer.endDocument();
		out.flush();
		out.close();
	}
}

javaBean

package cn.itcast.domain;

public class Person {
	private Integer id;
	private String name;
	private Integer age;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	public Person(Integer id, String name, Integer age) {
		this.id = id;
		this.name = name;
		this.age = age;
	}
	public Person(){}
}

添加测试用例

package cn.itcast.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import cn.itcast.domain.Person;
import cn.itcast.service.PersonService;
import android.test.AndroidTestCase;
import android.util.Log;

public class PersonServiceTest extends AndroidTestCase {
	private static final String TAG = "PersonServiceTest";
	
	public void testPersons() throws Exception{
		InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");
		List persons = PersonService.getPersons(xml);
		for(Person person : persons){
			Log.i(TAG, person.toString());
		}
	}
	
	public void testSave() throws Exception{
		List persons = new ArrayList();
		persons.add(new Person(43, "zhangxx", 80));
		persons.add(new Person(12, "lili", 20));
		persons.add(new Person(78, "xiaoxiao", 8));
		// <包>/files
		File xmlFile = new File(getContext().getFilesDir(), "itcast.xml");
		FileOutputStream outStream = new FileOutputStream(xmlFile);
		PersonService.save(persons, outStream);
	}
}