Android 开发工具类 21_SAXForHandler

解析 XML 有两种形式：

1、XMLReader

XMLReaser  xmlReader = saxParser.getXMLReader();
xmlReadeer.setContentHandler(hangdler);
xmlREader.pase(new InputSource(is));

2、SAXParser

saxParser.parse(is, handler);

其实 SAXParser 是 JAXP(Java API for XML Processing) 对 XMLReader 的一个封装。

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.util.Log;

import com.wangjialin.domain.Person;

public class SAXForHandler extends DefaultHandler {
    
    private static final String TAG = "SAXForHandler"; 
    private List<Person> persons;
    private String perTag ; // 通过此变量，记录前一个标签的名称。
    Person person;　　// 记录当前 Person
    
    public List<Person> getPersons() {
        return persons;
    }

    // 适合在此事件中触发初始化行为。
    public void startDocument() throws SAXException {
        persons = new ArrayList<Person>();
        Log.i(TAG , "***startDocument()***");
    }

    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++ ) {
                Log.i(TAG ,"attributeName:" + attributes.getLocalName(i)
                        + "_attribute_Value:" + attributes.getValue(i));
                person = new Person();
                person.setId(Integer.valueOf(attributes.getValue(i)));
            }
        }
        perTag = localName;
        Log.i(TAG , qName+"***startElement()***");
    }
    
    public void characters(char[] ch, int start, int length) throws SAXException {
        
        String data = new String(ch, start, length).trim();
        if(!"".equals(data.trim())){
               Log.i(TAG ,"content: " + data.trim());
        }
        if("name".equals(perTag)){
                person.setName(data);
        }else if("age".equals(perTag)){
                person.setAge(new Short(data));
        }
    }
    
    public void endElement(String uri, String localName, String qName) throws SAXException {
        
        Log.i(TAG , qName + "***endElement()***");
        if("person".equals(localName)){
            persons.add(person);
            person = null;
        }
        perTag = null;
    }

    public void endDocument() throws SAXException {
        
        Log.i(TAG , "***endDocument()***");
    }
}

Person.java

package com.wangjialin.domain;

public class Person {
    
    private Integer id;
    private String name;
    private Short age;

    public Person(){}
    
    public Person(Integer id, String name, Short age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    
    public Person(String name, Short age) {
        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 "id=" + id + ",name=" + name+ ",age=" + age;
    }
    
}

 JUnit 测试

public void testSAXGetPersons() throws Throwable{
        
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("wangjialin.xml");
        SAXForHandler saxForHandler = new SAXForHandler();
        // 获取 SAX 解析器的工厂对象
        SAXParserFactory spf = SAXParserFactory.newInstance();
        // 创建解析器对象
        SAXParser saxParser = spf.newSAXParser();
        // 设定解析的文件和自己定义的事件处理器对象
        saxParser.parse(inputStream, saxForHandler);
        
        List<Person> persons = saxForHandler.getPersons();
        inputStream.close();
        
        for(Person person:persons){
            Log.i(TAG, person.toString());
        }
    }

【参考】

http://blog.csdn.net/redarmy_chen/article/details/12951649