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;

	}

}

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;



	@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;

			}

			

		}

		

	}

}