Android XmlPullParser 方式解析 Xml 文档

Android XmlPullParser 方式解析 Xml 文档

xml 文件格式

<?xml version="1.0" encoding="UTF-8"?>
<persons>
  <person id="1">
    <name>张三</name>
    <age>22</age>
  </person>
  <person id="2">
    <name>李四</name>
    <age>20</age>
  </person>
</persons>

XmlPullParser 方式解析 xml 文件

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 com.eboy.domain.Person;
import android.util.Xml;

public class PersonService {
 public static List<Person> getPersons(InputStream xml) throws Exception {
  List<Person> persons = null;
  Person person = null;
  XmlPullParser pullParser = Xml.newPullParser();
  pullParser.setInput(xml, "UTF-8"); // 为Pull解释器设置要解析的XML数据
  int event = pullParser.getEventType();

  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 = Integer.valueOf(pullParser.getAttributeValue(0));
     person = new Person();
     person.setId(id);
    }
    if ("name".equals(pullParser.getName())) {
     String name = pullParser.nextText();
     person.setName(name);
    }
    if ("age".equals(pullParser.getName())) {
     int age = Integer.valueOf(pullParser.nextText());
     person.setAge(age);
    }
    break;

   case XmlPullParser.END_TAG:
    if ("person".equals(pullParser.getName())) {
     persons.add(person);
     person = null;
    }
    break;

   }

   event = pullParser.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 person : persons) {
   serializer.startTag(null, "person");
   serializer.attribute(null, "id", person.getId().toString());
   serializer.startTag(null, "name");
   serializer.text(person.getName().toString());
   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();
  out.flush();
  out.close();
 }
}

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