SAX解析xml，小实例

用的person.xml，Person.java文件同上一篇介绍Pull解析一样。

1 person.xml

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="000111">
        <name>tom</name>
        <age>230</age>
    </person>
    <person id="000222">
        <name>jerry</name>
        <age>233</age>
    </person>
</persons>

2 Person.java

package com.example.xml_saxparser;

public class Person {
    private Integer id;
    private String name;
    private Short age;
    public Person(){
    }
    public Person(Integer id, String name, Short age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public Person( String name, Short age) {
        super();
        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 "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    

}

3 SAX解析的handler，要继承DefaultHandler，选择要重写的方法，以下是主要的5个方法。

package com.example.xml_saxparser;

import java.util.ArrayList;
import java.util.List;

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

public class SAXforHandler extends DefaultHandler {
    private List<Person> persons;
    private Person person;
    private String perTag;

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

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if("person".equals(localName)){
            for(int i = 0; i < attributes.getLength(); i++){
                person = new Person();
                person.setId(Integer.valueOf(attributes.getValue(i)));
            }
        }
        perTag = localName;
    }
    
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        String data = new String(ch, start, length).trim();
        if(!"".equals(data.trim())){
        }
        if("name".equals(perTag)){
            person.setName(data);
        }else if("age".equals(perTag)){
            person.setAge(new Short(data));
        }
    }

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

    @Override
    public void endDocument() throws SAXException {
        
    }

}

4 单元测试，在日志中打印结果。

package com.example.xml_saxparser;

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

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

import org.xml.sax.SAXException;

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

import com.example.xml_saxparser.MainActivity;
import com.example.xml_saxparser.Person;
import com.example.xml_saxparser.SAXforHandler;

public class SAXJUnitTest extends AndroidTestCase {

    public void testSax() throws Exception{
        InputStream in = MainActivity.class.getClassLoader().getResourceAsStream("person.xml");
        SAXforHandler handler = new SAXforHandler();
        SAXParserFactory spf = SAXParserFactory.newInstance();
        SAXParser saxParser = spf.newSAXParser();
        saxParser.parse(in, handler);
        List<Person> list = handler.getPersons();
        in.close();
        for(Person p : list){
            Log.i("Person", p.toString());
        }
    }
}