Android应用中使用Pull解析XML文件（传智播客）

Service.java源码：

package com.sinaapp.ssun.service;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;

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

import android.util.Xml;

import com.sinaapp.ssun.domain.Person;

public class Service {
    /**
     * 获取XML文件中的数据
     * @param xml
     * @return
     * @throws Exception
     */
    public static List<Person> getPersons(InputStream xml) throws Exception {
        List<Person> persons = null;
        XmlPullParser parser = XmlPullParserFactory.newInstance()
                .newPullParser();
        // parser = Xml.newPullParser();
        parser.setInput(xml, "UTF-8");
        int event = parser.getEventType();
        Person p = null;
        while (event != XmlPullParser.END_DOCUMENT) {
            switch (event) {
            case XmlPullParser.START_DOCUMENT:
                persons = new ArrayList<Person>();
                break;
            case XmlPullParser.START_TAG:
                if("person".equals(parser.getName())){
                    p = new Person();
                    int id = Integer.parseInt(parser.getAttributeValue(0));
                    p.setId(id);
                }
                if("name".equals(parser.getName())){
                    String name = parser.nextText();
                    p.setName(name);
                }
                if("age".equals(parser.getName())){
                    int age = Integer.parseInt(parser.nextText());
                    p.setAge(age);
                }
                break;
            case XmlPullParser.END_TAG:
                if("person".equals(parser.getName())){
                    persons.add(p);
                    p = null;
                }
                break;
            }
            event = parser.next();
        }
        return persons;
    }

    /**
     * 保存数据到XML文件中
     * @param persons
     * @param out
     * @throws Exception
     */
    public static void save(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 p: persons){
            serializer.startTag(null, "person");
            serializer.attribute(null, "person", p.getId()+"");

            serializer.startTag(null, "name");
            serializer.text(p.getName());
            serializer.endTag(null, "name");

            serializer.startTag(null, "age");
            serializer.text(p.getAge()+"");
            serializer.endTag(null, "age");

            serializer.endTag(null, "person");
        }
        serializer.endTag(null, "persons");
        serializer.endDocument();
        out.flush();
        out.close();
    }
}

Person.java源码：

package com.sinaapp.ssun.domain;

public class Person {
    private String name;
    private int age;
    private int id;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }

    public Person(String name, int age, int id) {
        this.name = name;
        this.age = age;
        this.id = id;
    }
    public Person() {
        super();
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", id=" + id + "]";
    }
}

text.xml文件：

<!--test.xml-->
<?xml version="1.0" encoding="UTF-8"?><!-- 开始文档语法 -->
<persons>
        <person  id="1">
            <name>ssun</name>
            <age>19</age>
        </person>
        <person  id="2">
            <name>cobe</name>
            <age>24</age>
        </person>
</persons>

单元测试TestService.java源码：

package com.sinaapp.ssun.test;

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

import android.test.AndroidTestCase;
import android.util.Log;

import com.sinaapp.ssun.domain.Person;
import com.sinaapp.ssun.service.Service;

public class TestService extends AndroidTestCase {
    private final String Tag = "Test";

    public void testPersons() throws Exception{
        List<Person> persons = Service.getPersons(this.getClass().getClassLoader().getResourceAsStream("test.xml"));
        for(Person p : persons){
            Log.i(Tag, p.toString());
        }
    }

    public void testSave() throws Exception{
        List<Person> persons = new ArrayList<Person>();
        persons.add(new Person("www",19,23));
        persons.add(new Person("hhh",19,3));
        persons.add(new Person("qqq",19,24));
        persons.add(new Person("ooo",19,25));
        File file = new File(this.getContext().getFilesDir(),"test2.xml");
        FileOutputStream out = new FileOutputStream(file);
        Service.save(persons, out);
    }

}