pull解析
2根据文件创建一个数据类
3创建一个数据服务类
输出数据：
1创建一个解析器XmlPullParser（这是一个接口得到对象有两种方式，一，通过解析工厂获得 二XML对象Xml.newPullParser()获得）
3由于pull解析不会一次加载完成，所以需要通过XmlPullParser对象next(）移动
输入数据：
1XmlSerializer对象通过Xml.newSerializer()获得
要解析的xml文件
<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person id="23">
<name>liming</name>
<age>30</age>
</person>
<person id="24">
<name>zhangsan</name>
<age>25</age>
</person>
</persons>
person类
package domain;
public class Person {
private Integer id;
private String name;
private Integer age;
public Person(int id,String name,int age) {
this.id = id;
this.name = name;
this.age = age;
}
public Person() {
// TODO 自动生成的构造函数存根
}
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 + "]";
}
}
解析服务类
package com.example.pullxml;
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 domain.Person;
public class PersonService {
/*
* xml文件的一些介绍
* XmlPullParser是一个接口所以不能实例化。2种方法
* 标签 属性 标签内容值：
* 文件解析的几种状态：
* 进入时候pull解析不会一次全部加载：
* */
//得到数据
public static List<Person> getPerson(InputStream xml) throws Exception {
Person person=null;
XmlPullParser pullParser = Xml.newPullParser();
pullParser.setInput(xml,"UTF-8");//设置格式
ArrayList<Person> persons=null;
int event = pullParser.getEventType();
while (event!=XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
persons = new ArrayList<Person>();
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);
}
break;
}
event = pullParser.next();
}
return persons;
}
//输入数据
public static void sava(List<Person> 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();
}
}
测试类
package test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import android.test.AndroidTestCase;
import android.util.Log;
import com.example.pullxml.PersonService;
import domain.Person;
public class PersonServiceTest extends AndroidTestCase {
private static final String TAG = "PersonServiceTest";
//显示xml文件的数据
public void test() throws Exception{
InputStream xml=this.getClass().getClassLoader().getResourceAsStream("person.xml");
List<Person> persons = PersonService.getPerson(xml);
for(Person person:persons)
Log.i(TAG,person.toString());
}
//添加内容放入xml文件当中
public void sava()throws Exception{
List<Person> persons = new ArrayList<Person>();
persons.add(new Person(32,"nikan",80));
persons.add(new Person(31,30));
File xmlfile = new File(getContext().getFilesDir(),"itcast.xml");
FileOutputStream out = new FileOutputStream(xmlfile);
PersonService.sava(persons,out);
}
}
