Android用Sax，Pull，Dom解析xml

Android解析xml的三种方式。分别有Sax，Pull，Dom。

来看他们各是怎么实现的。

这是项目结构：

解析文件为Person.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="1">
        <name>cxa</name>
        <age>30</age>
    </person>
    <person id="2">
        <name>acs</name>
        <age>25</age>
    </person>
    <person id="3">
        <name>hgf</name>
        <age>30</age>
    </person>
    <person id="4">
        <name>rty</name>
        <age>25</age>
    </person>
    <person id="5">
        <name>gfj</name>
        <age>30</age>
    </person>
    <person id="6">
        <name>qty</name>
        <age>25</age>
    </person>
    <person id="7">
        <name>bdf</name>
        <age>30</age>
    </person>
    <person id="8">
        <name>liu</name>
        <age>25</age>
    </person>
</persons> 

分别来看各个文件实现。

XmlParserActivity.java:

package com.jayce.xmlparser;

import java.io.InputStream;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class XmlParserActivity extends Activity {
    private static final String TAG = "XmlParserActivity";
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        InputStream in = this.getResources().openRawResource(R.raw.person);
        List<Person> person = Pull.readXML(in);
        if(null != person)
        {
            for(int i = 0; i < person.size(); i++)
            {
                Log.i(TAG, "index:" + i);
                Person p = person.get(i);
                Log.i(TAG, "id:" + p.getID());
                Log.i(TAG, "name:" + p.getName());
                Log.i(TAG, "age:" + p.getAge());
            }
        }
    }
}

Person.java:

package com.jayce.xmlparser;

public class Person
{
    private Integer mID;
    private String mName;
    private Short mAge;
    
    public Integer getID()
    {
        return mID;
    }
    
    public void setID(Integer id)
    {
        this.mID = id;
    }
    
    public String getName()
    {
        return mName;
    }
    
    public void setName(String name)
    {
        this.mName = name;
    }
    
    public Short getAge()
    {
        return mAge;
    }
    
    public void setAge(Short age)
    {
        this.mAge = age;
    }
}

Sax.java:

package com.jayce.xmlparser;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class Sax
{
    public static List<Person> readXML(InputStream in)
    {
        SAXParserFactory spf = SAXParserFactory.newInstance();
        try {
            SAXParser saxParser = spf.newSAXParser();
            //saxParser.setProperty("http://xml.org/sax/features/namespaces", true);
            //saxParser.setProperty("http://xml.org/sax/features/namespace-prefixes", false);
            XMLContentHandler handler = new XMLContentHandler();
            saxParser.parse(in, handler);
            in.close();
            return handler.getPersons();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
}

class XMLContentHandler extends DefaultHandler
{
    private List<Person> persons = null;
    private Person currentPerson;
    private String tagName = null;
    
    public List<Person> getPersons()
    {
        return persons;
    }
    
    public void startDocument() throws SAXException
    {
        persons = new ArrayList<Person>();
    }
    
    public void characters(char[] ch, int start, int length)
    {
        if(null != tagName)
        {
            String data = new String(ch, start, length);
            if(tagName.equalsIgnoreCase("name"))
            {
                this.currentPerson.setName(data);
            }
            else if(tagName.equalsIgnoreCase("age"))
            {
                this.currentPerson.setAge(new Short(data));
            }
        }
    }
    
    public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException
    {
        this.tagName = localName;
        if(tagName.equalsIgnoreCase("person"))
        {
            currentPerson = new Person();
            currentPerson.setID(new Integer(atts.getValue("id")));
        }
    }
    
    public void endElement(String uri, String localName, String name) throws SAXException
    {
        if(localName.equalsIgnoreCase("person"))
        {
            persons.add(currentPerson);
            currentPerson = null;
        }
        this.tagName = null;
    }
}

Pull.java:

package com.jayce.xmlparser;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.util.Xml;

public class Pull
{
    public static List<Person> readXML(InputStream in)
    {
        XmlPullParser parser = Xml.newPullParser();
        
        try {
            parser.setInput(in, "UTF-8");
            int eventType = parser.getEventType();
            Person currentPerson = null;
            List<Person> persons = null;
            while(eventType != XmlPullParser.END_DOCUMENT)
            {
                switch(eventType)
                {
                    case XmlPullParser.START_DOCUMENT:
                    {
                        persons = new ArrayList<Person>();
                    }
                    break;
                    case XmlPullParser.START_TAG:
                    {
                        String tag = parser.getName();
                        if(tag.equalsIgnoreCase("person"))
                        {
                            currentPerson = new Person();
                            currentPerson.setID(new Integer(parser.getAttributeValue(null, "id")));
                        }
                        else if(currentPerson != null)
                        {
                            if(tag.equalsIgnoreCase("name"))
                            {
                                currentPerson.setName(parser.nextText());
                            }
                            else if(tag.equalsIgnoreCase("age"))
                            {
                                currentPerson.setAge(new Short(parser.nextText()));
                            }
                        }
                    }
                    break;
                    case XmlPullParser.END_TAG:
                    {
                        if(parser.getName().equalsIgnoreCase("person") && null != currentPerson)
                        {
                            persons.add(currentPerson);
                            currentPerson = null;
                        }
                    }
                    break;
                }
                eventType = parser.next();
            }
            in.close();
            return persons;
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return null;
    }
}

Dom.java:

package com.jayce.xmlparser;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class Dom
{
    public static List<Person> readXML(InputStream in)
    {
        List<Person> persons = new ArrayList<Person>();
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document dom = builder.parse(in);
            Element root = dom.getDocumentElement();
            NodeList items = root.getElementsByTagName("person");
            for(int i = 0; i < items.getLength(); i++)
            {
                Person person = new Person();
                Element personNode = (Element)items.item(i);
                person.setID(new Integer(personNode.getAttribute("id")));
                NodeList childsNodes = personNode.getChildNodes();
                for(int j = 0; j < childsNodes.getLength(); j++)
                {
                    Node node = (Node)childsNodes.item(j);
                    if(Node.ELEMENT_NODE == node.getNodeType())
                    {
                        if("name".equalsIgnoreCase(node.getNodeName()))
                        {
                            person.setName(node.getFirstChild().getNodeValue());
                        }
                        else  if("age".equalsIgnoreCase(node.getNodeName()))
                        {
                            person.setAge(new Short(node.getFirstChild().getNodeValue()));
                        }
                    }
                }
                persons.add(person);
            }
            in.close();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return persons;
    }
}