Android中DOM解析xml文件

一、在assets文件中写xml文件

<?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>

二、在service中写一个DOM解析的操作

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rootElement 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 blocke.printStackTrace();}return list;}}

三、在Activity中显示操作

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 XmlActivity extends 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;}}}}