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;
			}
			
		}
		
	}
}