Android中DOM解析xml檔案

一、在assets檔案中寫xml檔案

<?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中寫一個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>();// 建立DOM工廠對象DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();try {// DocumentBuilder對象DocumentBuilder builder = factory.newDocumentBuilder();// 擷取文檔對象Document document = builder.parse(is);// 擷取文檔對象的rootElement root = document.getDocumentElement();// 擷取persons根節點中所有的person節點對象NodeList personNodes = root.getElementsByTagName("person");// 遍曆所有的person節點for (int i = 0; i < personNodes.getLength(); i++) {Person person = new Person();// 根據item(index)擷取該索引對應的節點對象Element personNode = (Element) personNodes.item(i); // 具體的person節點// 設定id屬性值person.setId(Integer.parseInt(personNode.getAttribute("id")));// 擷取該節點下面的所有位元組點NodeList personChildNodes = personNode.getChildNodes();// 遍曆person的位元組點for (int index = 0; index < personChildNodes.getLength(); index++) {// 擷取子節點Node node = personChildNodes.item(index);// 判斷node節點是否是元素節點if (node.getNodeType() == Node.ELEMENT_NODE) {//把節點轉換成元素節點Element element = (Element) node;//判斷元素節點是否是name元素節點if ("name".equals(element.getNodeName())) {person.setName(element.getFirstChild().getNodeValue());} else if ("age".equals(element.getNodeName())) { //判斷是否是age節點person.setAge(new Short(element.getFirstChild().getNodeValue()));}}}// 把person對象加入到集合中list.add(person);}//關閉輸入資料流is.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return list;}}

三、在Activity中顯示操作

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 {//聲明組件public Button btn_sax,btn_dom,btn_pull;public XMLDomService xmlDomService;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//設定顯示的視圖setContentView(R.layout.activity_xml);xmlDomService=new XMLDomService();//根據id擷取組件btn_sax=(Button) findViewById(R.id.btn_sax);btn_dom=(Button) findViewById(R.id.btn_dom);btn_pull=(Button) findViewById(R.id.btn_pull);//為按鈕註冊事件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;}//匿名類class MyOnclickListener implements OnClickListener{@Overridepublic void onClick(View v) {int id=v.getId();switch (id) {case R.id.btn_sax:Toast.makeText(XmlActivity.this, "採用SAX解析", Toast.LENGTH_LONG).show();try{//SAX解析的工廠對象SAXParserFactory factory=SAXParserFactory.newInstance();//得到sax的解析器SAXParser saxParser=factory.newSAXParser();//建立handler對象XMLContentHandler handlerService=new XMLContentHandler();InputStream is=getAssets().open("csdn.xml");//直接解析saxParser.parse(is, handlerService);//通過handlerService對象擷取Toast.makeText(XmlActivity.this, "----"+handlerService, Toast.LENGTH_LONG).show();}catch(Exception e){e.printStackTrace();}break;case R.id.btn_dom:InputStream is=null;try{//擷取讀取檔案的輸入資料流對象is=getAssets().open("csdn.xml");//採用dom解析List<Person> persons=xmlDomService.parseXML(is);//簡單測試//Toast.makeText(XmlActivity.this, ""+persons.get(0).getName(), Toast.LENGTH_LONG).show();Toast.makeText(XmlActivity.this, "採用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, "採用PULL解析", Toast.LENGTH_LONG).show();break;default:break;}}}}