Android应用中使用DOM方式解析XML格式数据的基本方法

<?xml version="1.0" encoding="UTF-8"?> 
<persons> 
  <person id="23"> 
    <name>xiaanming</name> 
    <age>23</age> 
  </person> 
  <person id="20"> 
    <name>liudehua</name> 
    <age>28</age> 
  </person> 
</persons> 

package com.example.dom_parser; 
 
public class Person { 
  private int id; 
  private String name; 
  private int age; 
   
  public Person(){} 
   
  public Person(int id, String name, int age){ 
    this.id = id; 
    this.name = name; 
    this.age = age; 
  } 
 
  public int getId() { 
    return id; 
  } 
 
  public void setId(int id) { 
    this.id = id; 
  } 
 
  public String getName() { 
    return name; 
  } 
 
  public void setName(String name) { 
    this.name = name; 
  } 
 
  public int getAge() { 
    return age; 
  } 
 
  public void setAge(int age) { 
    this.age = age; 
  } 
   
  @Override 
  public String toString() { 
    return "id = " + id + ", name = " + name + ", age = " + age; 
  } 
   
} 

package com.example.dom_parser; 
 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.List; 
 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
 
import android.util.Log; 
 
 
public class DomPersonService { 
   
   
  public static List<Person> readXML() throws Throwable{ 
    //获得android.xml文件的输入流 
    InputStream is = MainActivity.class.getClassLoader().getResourceAsStream("android.xml"); 
    List<Person> persons = new ArrayList<Person>(); 
     
    //实例化DocumentBuilderFactory和DocumentBuilder，并创建Document 
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder builder = factory.newDocumentBuilder(); 
    Document document = builder.parse(is); 
     
    //返回文档的根(root)元素 
    Element rootElement = document.getDocumentElement(); 
     
    //获取一个Note(DOM基本的数据类型)集合，这里有两个person Note 
    NodeList nodes = rootElement.getElementsByTagName("person"); 
     
    //遍历Note集合 
    for(int i=0; i<nodes.getLength(); i++){ 
      //先从第一个person元素开始解析 
      Element personElement = (Element) nodes.item(i); 
      Person person = new Person(); 
      person.setId(Integer.valueOf(personElement.getAttribute("id"))); 
       
      //获取person下面的name 和 age 的Note集合 
      NodeList chileNodes = personElement.getChildNodes(); 
      for(int y=0; y<chileNodes.getLength(); y++){ 
        Node childNode = chileNodes.item(y); 
         
        //判断子Note的类型为元素Note 
        if(childNode.getNodeType() == Node.ELEMENT_NODE){ 
          Element childElement = (Element) childNode; 
        if("name".equals(childElement.getNodeName())){ 
          person.setName(childElement.getFirstChild().getNodeValue()); 
        }else if("age".equals(childElement.getNodeName())){ 
          person.setAge(Integer.valueOf(childElement.getFirstChild().getNodeValue())); 
        } 
        } 
      } 
       
      Log.e("log", person.toString()); 
       
      persons.add(person); 
    } 
     
    return persons; 
     
  } 
}