android XML解析器全解案例

1.使用pull解析

 package com.example.myxml;

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

 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserFactory;

 import android.util.Log;
 import android.util.Xml;

 public class Pullparser {

     public static List<Person> getPerson(InputStream inStream) throws Exception {
         List<Person> psonList = new ArrayList<Person>();
         Person person = null;
         XmlPullParser xmlParse = Xml.newPullParser();
         try {
             xmlParse.setInput(inStream, "utf-8");
             int evnType = xmlParse.getEventType();
             while (evnType != XmlPullParser.END_DOCUMENT) {
                 switch (evnType) {
                 case XmlPullParser.START_TAG:
                     String tag = xmlParse.getName();
                     if (tag.equalsIgnoreCase("person")) {
                         person = new Person();
                         person.setId(Integer.parseInt(xmlParse.getAttributeValue(0)));
                     } else if (person != null) {
                         // parse after tag
                         if (tag.equalsIgnoreCase("name")) {
                             person.setName(xmlParse.nextText());
                         } else if (tag.equalsIgnoreCase("age")) {
                             person.setAge(xmlParse.nextText());
                         }
                     }
                     break;
                 case XmlPullParser.END_TAG:
                     if (xmlParse.getName().equalsIgnoreCase("person")
                             && person != null) {
                         psonList.add(person);
                         person = null;
                     }
                     break;
                 default:
                     break;
                 }
                 evnType = xmlParse.next();
             }
         } catch (Exception e) {
         }
         return psonList;
     }
 }

2.使用DOM解析

package com.example.myxml;

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 android.annotation.SuppressLint;

public class DOMparser {

    @SuppressLint("UseValueOf")
    public static List<Person> parse(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(age);
                    }
                }
            }
            persons.add(person);
        }
        inStream.close();
        return persons;
    }
}

3.使用SAX解析

package com.example.myxml;

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 android.annotation.SuppressLint;

public class SAXparser extends DefaultHandler {
    private List<Person> persons;
    private Person person;
    private String preTAG;  

    @Override
    public void startDocument() throws SAXException {
        persons = new ArrayList<Person>();
    }  

    @Override
    public void characters(char[] ch, int start, int length)throws SAXException {
        if (person != null) {
            String data = new String(ch, start, length);
            if ("name".equals(preTAG)) {
                person.setName(data);
            } else if ("age".equals(preTAG)) {
                person.setAge(data);
            }
        }
    }  

    @SuppressLint("UseValueOf")
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if ("person".equals(localName)) {
            person = new Person();
            person.setId(new Integer(attributes.getValue(0)));
        }
        preTAG = localName;
    }  

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        if ("person".equals(localName) && person != null) {
            persons.add(person);
            person = null;
        }
        preTAG = null;
    }  

    public List<Person> getPersons() {
        return persons;
    }
}  

案例辅助代码

xML文件

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="23">
        <name>张三</name>
        <age>54</age>
    </person>
    <person id="20">
        <name>小明</name>
        <age>266</age>
    </person>
</persons>  

读取本地XML文件流

package com.example.myxml;

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

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

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    TextView resultView;
    List<Person> personList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        resultView = (TextView) findViewById(R.id.result);
        InputStream inStream = MainActivity.class.getClassLoader().getResourceAsStream("personxml.xml");
        // SAX_Parser(inStream);
        // DOM_Parser(inStream);
        PULL_Parser(inStream);
        visity();
    }

    private void PULL_Parser(InputStream inStream) {
        try {
            personList=    Pullparser.getPerson(inStream);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private void DOM_Parser(InputStream inStream) {
        try {
            personList = DOMparser.parse(inStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void SAX_Parser(InputStream inStream) {
        try {
            // 得到SAX解析器的工厂实例
            SAXParserFactory spf = SAXParserFactory.newInstance();
            // 从SAX工厂实例中获得SAX解析器
            SAXParser saxParser = spf.newSAXParser();
            SAXparser handler = new SAXparser();
            saxParser.parse(inStream, handler);
            inStream.close();

            personList = handler.getPersons();
        } catch (Exception e) {
        }
    }
    public void visity(){
        if(personList!=null){
            StringBuilder sb = new StringBuilder();
            for (Person person : personList) {
                sb.append(person.toString()).append("\n");
            }
            resultView.setText(sb.toString());
        }else{
            Toast.makeText(getApplicationContext(), "null", 0).show();
        }

    }
}