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>