Android中使用pull解析器操作xml文件的解决办法

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 com.ljq.entity.Person;

import android.util.Xml;

/**
 * Pull解析xml文件
 *
 * @author jiqinlin
 *
 */
public class PullPersonService {

    /**
     * 使用pull解析器生成xml文件
     *
     * @param persons
     * @param writer
     * @return
     */
    public static String writeXML(List persons, Writer writer){
        XmlSerializer serializer = Xml.newSerializer();
        try {
            serializer.setOutput(writer);
            serializer.startDocument("UTF-8", true);
            //第一个参数为命名空间,如果不使用命名空间,可以设置为null
            serializer.startTag("", "persons");
            for (Person person : persons){
                serializer.startTag("", "person");
                serializer.attribute("", "id", person.getId().toString());
                serializer.startTag("", "name");
                serializer.text(person.getName());
                serializer.endTag("", "name");
                serializer.startTag("", "age");
                serializer.text(person.getAge().toString());
                serializer.endTag("", "age");
                serializer.endTag("", "person");
            }
            serializer.endTag("", "persons");
            serializer.endDocument();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return writer.toString();
    }

    /**
     * 使用pull解析器解析xml文件
     *
     * @param inStream
     * @return
     * @throws Exception
     */
    public static List readXML(InputStream inStream) throws Exception {
        XmlPullParser parser = Xml.newPullParser();
        parser.setInput(inStream, "UTF-8");
        int eventType = parser.getEventType();
        Person currentPerson = null;
        List persOns= null;
        while (eventType != XmlPullParser.END_DOCUMENT) {
            switch (eventType) {
            case XmlPullParser.START_DOCUMENT:// 文档开始事件,可以进行数据初始化处理
                persOns= new ArrayList();
                break;
            case XmlPullParser.START_TAG:// 开始元素事件
                String name = parser.getName();
                if (name.equalsIgnoreCase("person")) {
                    currentPerson = new Person();
                    currentPerson.setId(new Integer(parser.getAttributeValue(null, "id")));
                } else if (currentPerson != null) {
                    if (name.equalsIgnoreCase("name")) {
                        currentPerson.setName(parser.nextText());// 如果后面是Text元素,即返回它的值
                    } else if (name.equalsIgnoreCase("age")) {
                        currentPerson.setAge(new Short(parser.nextText()));
                    }
                }
                break;
            case XmlPullParser.END_TAG:// 结束元素事件
                if (parser.getName().equalsIgnoreCase("person")&& currentPerson != null) {
                    persons.add(currentPerson);
                    currentPerson = null;
                }
                break;
            }
            eventType = parser.next();
        }
        inStream.close();
        return persons;
    }

}

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

import com.ljq.entity.Person;
import com.ljq.service.PullPersonService;

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

public class PullPersonServiceTest extends AndroidTestCase{
    private final String TAG = "PullPersonServiceTest";
    /**
     * 使用pull解析器解析xml文件
     *
     * @throws Exception
     */
    public void testReadXML() throws Exception{
        //InputStream inputStream = PullPersonServiceTest.class.getClassLoader().getResourceAsStream("ljq.xml");
        InputStream inputStream= this.getContext().openFileInput("123.xml");
        List persOns= PullPersonService.readXML(inputStream);
        for(Person person : persons){
           Log.i(TAG, person.getId() + " : " + person.getName() + " : " + person.getAge());
        }
    }

    /**
     * 使用pull解析器生成xml文件
     *
     * @throws Exception
     */
    public void testWriteXml() throws Exception{
        FileOutputStream fileOutputStream = this.getContext().openFileOutput("123.xml", Context.MODE_PRIVATE);
        OutputStreamWriter outStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");
        List persOns= new ArrayList();
        persons.add(new Person(1, "zhangsan",  (short)12));
        persons.add(new Person(2, "lisi",  (short)34));
        BufferedWriter writer = new BufferedWriter(outStreamWriter);
        String string = PullPersonService.writeXML(persons, writer);
        Log.i(TAG, string.toString());
    }
}