Android中Sax解析与Dom解析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>

<person id="24">

<name>常瑞鹏</name>

<age>65</age>

</person>

</persons>

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package com.example.day03_xml.domain;

import java.io.Serializable;

public class Person implements Serializable{

/**

*

*/

private static final long serialVersionUID = 1L;

private int id;

private String name;

private short age;

public Person() {

super();

// TODO Auto-generated constructor stub

}

public Person(int id, String name, short age) {

super();

this.id = id;

this.name = name;

this.age = age;

}

public int getId() {

return id;

}

public void setId(int 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;

}

}

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package com.example.day03_xml.service;

import java.util.ArrayList;

import java.util.List;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

import com.example.day03_xml.domain.Person;

public class XMLContentHandlerService extends DefaultHandler {

// 解析的person对象储存到list集合中

private List<Person> persons;

// 解析当前person对象

public Person currenPerson;

// 声明标签名称

public String tagName;

public List<Person> getPersons() {

return persons;

}

public void setPersons(List<Person> persons) {

this.persons = persons;

}

@Override

public void characters(char[] ch, int start, int length)

throws SAXException {

super.characters(ch, start, length);

// 首先判断tagName是否为空

if (tagName != null) {

// 获取标签中的内容

String data = new String(ch, start, length);

// 判断标签是否是name

if (tagName.equals("name")) {

currenPerson.setName(data);

} else if (tagName.equals("age")) {// 判断标签是否是age

currenPerson.setAge((short) Integer.parseInt(data));

}

}

}

@Override

public void endElement(String uri, String localName, String qName)

throws SAXException {

super.endElement(uri, localName, qName);

// 当person标签结束的时候 把person对象存储到集中

if (localName.equals("person")) {

persons.add(currenPerson);

// 当对象=null

currenPerson = null;

}

// person age

// name

this.tagName = null;

}

/**

* 文档开始触发的事件

*/

@Override

public void startDocument() throws SAXException {

super.startDocument();

persons = new ArrayList<Person>();

}

@Override

public void startElement(String uri, String localName, String qName,

Attributes attributes) throws SAXException {

super.startElement(uri, localName, qName, attributes);

// 判断解析的标签是否是person

if (localName.equals("person")) {

// 创建person对象

currenPerson = new Person();

// 把id属性的值解析出来 并且把id赋值给currentPerson对象

currenPerson.setId(Integer.parseInt(attributes.getValue(0)));

}

// person name age

this.tagName = localName;

}

public void endDocument() throws SAXException {

super.endDocument();

}

}

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package com.example.day03_xml.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.day03_xml.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())) {

person.setAge(new Short(element.getFirstChild()

.getNodeValue()));

}

}

}

// 把person对象加入到集合中

list.add(person);

}

is.close();

} catch (Exception e) {

e.printStackTrace();

}

return list;

}

}

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package com.example.day03_xml;

import java.io.IOException;

import java.io.InputStream;

import java.util.List;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import com.example.day03_xml.domain.Person;

import com.example.day03_xml.service.XMLContentHandlerService;

import com.example.day03_xml.service.XMLDomService;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

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_main);

// 实例化

xmlDomService = new XMLDomService();

// 通过findViewById方法获取控件对象

btn_sax = (Button) findViewById(R.id.btn_sax);

btn_dom = (Button) findViewById(R.id.btn_dom);

btn_pull = (Button) findViewById(R.id.btn_pull);

// 给按钮注册事件

btn_sax.setOnClickListener(new MyClickListener());

btn_dom.setOnClickListener(new MyClickListener());

btn_pull.setOnClickListener(new MyClickListener());

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

class MyClickListener implements View.OnClickListener {

@Override

public void onClick(View v) {

int id = v.getId();

switch (id) {

case R.id.btn_sax:

Toast.makeText(MainActivity.this, "采用sax解析xml",

Toast.LENGTH_LONG).show();

// sax解析的工厂对象

SAXParserFactory factory = SAXParserFactory.newInstance();

// 得到sax的解析器

try {

SAXParser saxParser = factory.newSAXParser();

// 创建handler对象

XMLContentHandlerService handlerService = new XMLContentHandlerService();

// 获取到了aserts目录中的csdn.xml文件

InputStream is = getAssets().open("csdn.xml");

// 直接解析 InputStream的流对象

saxParser.parse(is, handlerService);

// 通过 handlerService对象

Toast.makeText(MainActivity.this,

"---" + handlerService.getPersons().size(),

Toast.LENGTH_LONG).show();

} catch (Exception e) {

e.printStackTrace();

}

break;

case R.id.btn_dom:

Toast.makeText(MainActivity.this, "采用dom解析xml",

Toast.LENGTH_LONG).show();

InputStream is = null;

try {

is = getAssets().open("csdn.xml");

List<Person> persons = xmlDomService.parseXML(is);

Toast.makeText(MainActivity.this,

"" + persons.get(0).getName(), Toast.LENGTH_LONG)

.show();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

case R.id.btn_pull:

Toast.makeText(MainActivity.this, "采用pull解析xml",

Toast.LENGTH_LONG).show();

break;

}

}

}

}

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<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.day03_xml"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="17" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.example.day03_xml.MainActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

</manifest>

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<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="app_name">day03-xml</string>

<string name="action_settings">Settings</string>

<string name="hello_world">Hello world!</string>

<string name="btn_sax">采用sax解析</string>

<string name="btn_dom">采用Dom解析xml</string>

<string name="btn_pull">采用pull解析xml</string>

</resources>

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity" >

<Button

android:id="@+id/btn_sax"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentTop="true"

android:layout_marginTop="18dp"

android:text="@string/btn_sax" />

<Button

android:id="@+id/btn_dom"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn_sax"

android:layout_alignRight="@+id/btn_sax"

android:layout_below="@+id/btn_sax"

android:layout_marginTop="65dp"

android:text="@string/btn_dom" />

<Button

android:id="@+id/btn_pull"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn_dom"

android:layout_alignRight="@+id/btn_dom"

android:layout_below="@+id/btn_dom"

android:layout_marginTop="69dp"

android:text="@string/btn_pull" />

</RelativeLayout>