Android 开发工具类 22_PullPersonService

PULL 解析 XML

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 com.wangjialin.domain.Person;

public class PullPersonService {
    // 生成 XML
    public static void save(List<Person> persons, OutputStream outStream) throws Exception{
        
        XmlSerializer serializer = Xml.newSerializer();
        serializer.setOutput(outStream, "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();
        outStream.flush();
        outStream.close();
    }

    public static List<Person> getPersons(InputStream inStream) throws Exception{
        
        Person person = null;
        List<Person> persons = null;
        XmlPullParser pullParser = Xml.newPullParser();
        pullParser.setInput(inStream, "UTF-8");
        int event = pullParser.getEventType();　　// 触发第一个事件
        
        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(person != null){
                    if("name".equals(pullParser.getName())){
                        person.setName(pullParser.nextText());
                    }
                    if("age".equals(pullParser.getName())){
                        person.setAge(new Short(pullParser.nextText()));
                    }
                }
                break;
                
            case XmlPullParser.END_TAG:
                if("person".equals(pullParser.getName())){
                    persons.add(person);
                    person = null;
                }
                break;
            }
            event = pullParser.next();
        }
        return persons;
    }
}

JUnit 测试

public void testPullgetPersons() throws Throwable{
        
        InputStream inStream = this.getClass().getClassLoader().getResourceAsStream("wangjialin.xml");
        List<Person> persons = PullPersonService.getPersons(inStream);
        
        for(Person person : persons){
            Log.i(TAG, person.toString());
        }
    }
    
    public void testSave()     throws Throwable{
        
        File file = new File(this.getContext().getFilesDir(), "wangjialin.xml");
        FileOutputStream outStream = new FileOutputStream(file);
        
        List<Person> persons = new ArrayList<Person>();
        persons.add(new Person(90, "wangjialin", (short)13));
        persons.add(new Person(35, "jialingege", (short)23));
        persons.add(new Person(78, "Android", (short)33));
        
        PullPersonService.save(persons, outStream);
    }

wangjialin.xml

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id = "23">
        <name>NEwii</name>
        <age>21</age>
    </person>
    <person id = "20">
        <name>WiiWill</name>
        <age>25</age>
    </person>
</persons>