xml解析--SAX解析

                    xml解析---SAX

工程结构图：
[img]

[/img]

这里的stu.xml文件是在src下的，而不是包里面的！

一、xml文件（随便写了一个）

<?xml version="1.0" encoding="utf-8"?>
<students>
	<student id="1">
		<name>tom</name>
		<age>20</age>
	</student>
	
	<student id="2">
		<name>kite</name>
		<age>21</age>
	</student>
	
	<student id="3">
		<name>rose</name>
		<age>22</age>
	</student>

</students>

二、Student类

package com.amaker.sax;

public class Student {
	
	private int id;
	private int age;
	private String name;
	/**
	 * 无参构造方法
	 */
	public Student() {
		super();
	}
	/**
	 * 带参构造方法
	 */
	public Student(int id, int age, String name) {
		super();
		this.id = id;
		this.age = age;
		this.name = name;
	}


	public int getId() {
		return id;
	}
	
	public void setId(int id) {
		this.id = id;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Student [age=" + age + ", id=" + id + ", name=" + name + "]";
	}
	
	
}

三、MyDefaultHandler

package com.amaker.sax;

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 MyDefaultHandler extends DefaultHandler {
	
	private List<Student> studentList;
	private Student currentStudent;
	private String currentTag;
	@Override
	public void startDocument() throws SAXException {
		super.startDocument();
		studentList = new ArrayList<Student>();
	}
	@Override
	public void endDocument() throws SAXException {
		super.endDocument();
	}
	
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		super.startElement(uri, localName, qName, attributes);
		if(qName!=null&&qName.equals("student")){
			currentStudent = new Student();
			int id = Integer.parseInt(attributes.getValue("id"));
			currentStudent.setId(id);
		}
		currentTag = qName;
	}
	
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		super.endElement(uri, localName, qName);
		
		if(qName!=null&&qName.equals("student")){
			studentList.add(currentStudent);
			currentStudent = null;
		}
		currentTag = null;
	}
	
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		super.characters(ch, start, length);
		if(currentTag!=null){
			String data = new String(ch,start,length);
			if(currentTag.equals("name")){
				currentStudent.setName(data);
			}
			if(currentTag.equals("age")){
				currentStudent.setAge(Integer.parseInt(data));
			}
		}
	}
	
	public List<Student> getStudents(){
		return studentList;
	}
}

四、测试：Test

package com.amaker.sax;

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;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		parse();
	}
	
	public static void parse(){
		InputStream in = new Test().getClass().getClassLoader().getResourceAsStream("stu.xml");
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser= factory.newSAXParser();
			MyDefaultHandler handler = new MyDefaultHandler();
			parser.parse(in, handler);
			
			List<Student> list = handler.getStudents();
			for(Student s:list){
				System.out.println(s);
			}
			
			
		} catch(Exception e) {
			e.printStackTrace();
		}
	}

}