Pull解析器学习

1，

package com.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.XmlPullParserFactory;
import org.xmlpull.v1.XmlSerializer;

import android.util.Xml;

import com.model.Person;

/**
 * 解析基类
 * @author HJ
 *
 */
public class BaseParser {

    /** Pull解析器解析XML文件数据
     * @param xml 待解析数据以InputStream方式传入
     * @return
     * @throws Exception
     */
    public List<Person> getPersons(InputStream xml)throws Exception{
        List<Person> persons = null;
        Person person = null;
        XmlPullParser pull = Xml.newPullParser();
        //XmlPullParser pull = XmlPullParserFactory.newInstance().newPullParser();  //通过XMLPullParserFactory工厂类获取Pull解析器
        pull.setInput(xml, "UTF-8");//为pull解析器设置需要解析的xml数据
        int event = pull.getEventType();
        while(event!=XmlPullParser.END_DOCUMENT){
            switch (event) {
            case XmlPullParser.START_DOCUMENT:
                persons = new ArrayList<Person>();
                break;
            case XmlPullParser.START_TAG:
                if ("person".equals(pull.getName())) {
                    person = new Person();
                    String IDcard = pull.getAttributeValue(0);
                    person.setIDCard(IDcard);
                }
                if ("name".equals(pull.getName())) {
                    String name = pull.nextText();
                    person.setName(name);
                }
                if ("sex".equals(pull.getName())) {
                    String sex = pull.nextText();
                    person.setSex(sex);
                }
                if ("address".equals(pull.getName())) {
                    String address = pull.nextText();
                    person.setAddress(address);
                }
                break;
            case XmlPullParser.END_TAG:
                if ("person".equals(pull.getName())) {
                    persons.add(person);
                    person = null;
                }
                break;
            }

            event = pull.next();
        }
        return persons;
    }
    /**
     * 对象方式保存数据到XML文件
     * @param persons 待保存数据集合
     * @param out 输出流
     * @throws Exception
     */
    public void saveToXML(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,"IDCard", person.getIDCard());
            //name 节点
            serializer.startTag(null,"name");
            serializer.text(person.getName());
            serializer.endTag(null, "name");
            //sex 节点
            serializer.startTag(null, "sex");
            serializer.text(person.getSex());
            serializer.endTag(null, "sex");
            //address 节点
            serializer.startTag(null, "address");
            serializer.text(person.getAddress());
            serializer.endTag(null, "address");

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

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person IDcard="215x">
        <name>Mr.Chiang</name>
        <sex>Gentleman</sex>
        <address>China</address>
    </person>
    <person IDcard="9527">
        <name>Mrs.Chen</name>
        <sex>Lady</sex>
        <address>France</address>
    </person>
</persons>
 3，测试类

    package com.emolay.test;

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

    import com.model.Person;
    import com.service.BaseParser;

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

    public class BaseParserTest extends AndroidTestCase {
        private static final String TAG = "BaseParserTest";

        /**
         * test getPersons method
         *
         * @throws Exception
         */
        public void testGetPersons() throws Exception {
            InputStream xml = this.getClass().getClassLoader()
                    .getResourceAsStream("persons.xml");
            BaseParser baseParser = new BaseParser();
            List<Person> persons = baseParser.getPersons(xml);
            for (Person p : persons) {
                Log.i(TAG, p.getIDCard());
            }
        }

        /**
         * test saveToXML method
         *
         * @throws Exception
         */
        public void testSaveToXML() throws Exception {
            InputStream xml = this.getClass().getClassLoader()
                    .getResourceAsStream("persons.xml");
            BaseParser baseParser = new BaseParser();
            List<Person> persons = baseParser.getPersons(xml);
            File fileXML = new File(getContext().getFilesDir(), "NewPersons.xml");
            FileOutputStream out = new FileOutputStream(fileXML);
            baseParser.saveToXML(persons, out);
        }
    }