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();
  }
}

（完）