Android开发之DOM解析xml文件的方法

<?xml version="1.0" encoding="UTF-8"?> 
<persons> 
 <person id="23"> 
  <name>李明</name> 
  <age>30</age> 
 </person> 
 <person id="20"> 
  <name>李向梅</name> 
  <age>25</age> 
 </person> 
</persons>

package com.example.service; 
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 com.example.domain.Person; 
public class XMLDomService { 
 public List<Person> parseXML(InputStream is) { 
  List<Person> list = new ArrayList<Person>(); 
  // 创建DOM工厂对象 
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  try { 
   // DocumentBuilder对象 
   DocumentBuilder builder = factory.newDocumentBuilder(); 
   // 获取文档对象 
   Document document = builder.parse(is); 
   // 获取文档对象的root 
   Element root = document.getDocumentElement(); 
   // 获取persons根节点中所有的person节点对象 
   NodeList personNodes = root.getElementsByTagName("person"); 
   // 遍历所有的person节点 
   for (int i = 0; i < personNodes.getLength(); i++) { 
    Person person = new Person(); 
    // 根据item(index)获取该索引对应的节点对象 
    Element personNode = (Element) personNodes.item(i); // 具体的person节点 
    // 设置id属性值 
    person.setId(Integer.parseInt(personNode.getAttribute("id")));
    // 获取该节点下面的所有字节点 
    NodeList personChildNodes = personNode.getChildNodes(); 
    // 遍历person的字节点 
    for (int index = 0; index < personChildNodes.getLength(); index++) { 
     // 获取子节点 
     Node node = personChildNodes.item(index); 
     // 判断node节点是否是元素节点 
     if (node.getNodeType() == Node.ELEMENT_NODE) { 
      //把节点转换成元素节点 
      Element element = (Element) node; 
      //判断元素节点是否是name元素节点 
      if ("name".equals(element.getNodeName())) { 
       person.setName(element.getFirstChild() 
         .getNodeValue()); 
      } else if ("age".equals(element.getNodeName())) { //判断是否是age节点 
       person.setAge(new Short(element.getFirstChild().getNodeValue()));
      } 
     } 
    } 
    // 把person对象加入到集合中 
    list.add(person); 
   } 
   //关闭输入流 
   is.close(); 
  } catch (Exception e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } 
  return list; 
 } 
}

package com.example.lession03_xml;
import java.io.InputStream;
import java.util.List;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import com.example.domain.Person;
import com.example.service.XMLContentHandler;
import com.example.service.XMLDomService;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputBinding;
import android.widget.Button;
import android.widget.Toast;
public class XmlActivityextends Activity {
//声明组件
public Button btn_sax,btn_dom,btn_pull;
public XMLDomService xmlDomService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置显示的视图
setContentView(R.layout.activity_xml);
xmlDomService=new XMLDomService();
//根据id获取组件
btn_sax=(Button) findViewById(R.id.btn_sax);
btn_dom=(Button) findViewById(R.id.btn_dom);
btn_pull=(Button) findViewById(R.id.btn_pull);
//为按钮注册事件
btn_sax.setOnClickListener(new MyOnclickListener());
btn_dom.setOnClickListener(new MyOnclickListener());
btn_pull.setOnClickListener(new MyOnclickListener());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.xml, menu);
return true;
}
//匿名类
class MyOnclickListener implements OnClickListener{
@Override
public void onClick(View v) {
int id=v.getId();
switch (id) {
case R.id.btn_sax:
Toast.makeText(XmlActivity.this,"采用SAX解析", Toast.LENGTH_LONG).show();
try{
//SAX解析的工厂对象
SAXParserFactory factory=SAXParserFactory.newInstance();
//得到sax的解析器
SAXParser saxParser=factory.newSAXParser();
//创建handler对象
XMLContentHandler handlerService=new XMLContentHandler();
InputStream is=getAssets().open("csdn.xml");
//直接解析
saxParser.parse(is, handlerService);
//通过handlerService对象获取
Toast.makeText(XmlActivity.this,"----"+handlerService, Toast.LENGTH_LONG).show();
}catch(Exception e){
e.printStackTrace();
}
break;
case R.id.btn_dom:
InputStream is=null;
try{
//获取读取文件的输入流对象
is=getAssets().open("csdn.xml");
//采用dom解析
List<Person> persons=xmlDomService.parseXML(is);
//简单测试
//Toast.makeText(XmlActivity.this, ""+persons.get(0).getName(), Toast.LENGTH_LONG).show();
Toast.makeText(XmlActivity.this,"采用DOM解析"+persons.get(0).getName(), Toast.LENGTH_LONG).show();
}catch(Exception e){
e.printStackTrace();
}
break;
case R.id.btn_pull:
Toast.makeText(XmlActivity.this,"采用PULL解析", Toast.LENGTH_LONG).show();
break;
default:
break;
}
}
}
}