Android中DOM解析XML文件

一、在assets文件中写xml文件
[html] view plaincopyprint?<?xmlversion="1.0"encoding="UTF-8"?>
<persons>
<personid="23">
<name>李明</name>
<age>30</age>
</person>
<personid="20">
<name>李向梅</name>
<age>25</age>
</person>
</persons>

<?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

[java]
view plaincopyprint?

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.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

[java]
view plaincopyprint?

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;

@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;

}

}

}
}