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;@Overrideprotected 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());}@Overridepublic 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{@Overridepublic 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;}}}}