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();
        }

    }
}