优点：使用DOM解析XML的代码看起来比较直观，并且在某些方面比基于SAX的实现更加简单。

缺点：DOM需要将XML文件的所有内容以文档树的方式存放在内存中，所以内存的消耗比较大。

使用场合：如果XML文件的内容比较小，采用DOM也是可行的。

DOM解析XML文件的基本思路如下：

利用DocumentBuilderFactory创建一个DocumentBuilderFactory实例。

利用DocumentBuilderFactory创建DocumentBuilder.

加载XML文档（Document）

获取文档的根节点（Element）

获取根节点中所有子节点的列表（NodeList）

获取子节点列表中的需要读取的节点

Node接口的主要方法：

domain：

package com.wangjialin.domain;

public class Person {
	private Integer id;
	private String name;
	private Short age;

	public Person() {
	}

	public Person(Integer id, String name, Short age) {
		this.id = id;
		this.name = name;
		this.age = age;
	}

	public Person(String name, Short age) {
		this.name = name;
		this.age = age;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Short getAge() {
		return age;
	}

	public void setAge(Short age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "id=" + id + ",name=" + name + ",age=" + age;
	}

}

package com.wangjialin.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.wangjialin.domain.Person;

public class DOMPersonService {
	public static List<Person> getPersons(InputStream inStream)
			throws Exception {
		List<Person> persons = new ArrayList<Person>();
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder = factory.newDocumentBuilder();
		Document document = builder.parse(inStream);
		Element root = document.getDocumentElement();
		NodeList personNodes = root.getElementsByTagName("person");
		for (int i = 0; i < personNodes.getLength(); i++) {
			Element personElement = (Element) personNodes.item(i);
			int id = new Integer(personElement.getAttribute("id"));
			Person person = new Person();
			person.setId(id);
			NodeList childNodes = personElement.getChildNodes();
			for (int y = 0; y < childNodes.getLength(); y++) {
				if (childNodes.item(y).getNodeType() == Node.ELEMENT_NODE) {
					if ("name".equals(childNodes.item(y).getNodeName())) {
						String name = childNodes.item(y).getFirstChild()
								.getNodeValue();
						person.setName(name);
					} else if ("age".equals(childNodes.item(y).getNodeName())) {
						String age = childNodes.item(y).getFirstChild()
								.getNodeValue();
						person.setAge(new Short(age));
					}
				}
			}
			persons.add(person);
		}
		inStream.close();
		return persons;
	}
}

package com.wangjialin.xml;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import android.test.AndroidTestCase;
import android.util.Log;

import com.wangjialin.domain.Person;
import com.wangjialin.service.DOMPersonService;

public class PersonServiceTest extends AndroidTestCase {
	private static final String TAG = "PersonServiceTest";

	public void testDOMgetPersons() throws Throwable {
		InputStream inStream = this.getClass().getClassLoader()
				.getResourceAsStream("wangjialin.xml");
		List<Person> persons = DOMPersonService.getPersons(inStream);
		for (Person person : persons) {
			Log.i(TAG, person.toString());
		}
	}

}

wangjialin.xml

<?xml version="1.0" encoding="UTF-8"?>
<persons>
	<person id = "23">
		<name>NEwii</name>
		<age>21</age>
	</person>
	<person id = "20">
		<name>WiiWill</name>
		<age>25</age>
	</person>
</persons>

android DOM解析XML,布布扣,bubuko.com

android DOM解析XML